Zinc oxide nanostructure-based dye-sensitized solar cells
Source abstract
Abstract
Developing new technologies that could lead to alternatives to the traditional silicon-based solar panels, and to efficiently light the world in the future, is critically important because of limited natural petroleum resources. Dye-sensitized solar cells (DSSCs) are promisingly efficient and clean hybrid, organic–inorganic, low-cost molecular solar cell devices. The key components of DSSCs are the organic dyes that play the role of a photosensitizer—like the chlorophyll of a green plant that is responsible for photosynthesis—and nanostructured semiconductor metal oxides. Because of their unique, multifunctional properties, zinc oxide (ZnO) nanostructures are promising materials to use to create photoanodes for DSSCs. This review looks at recent developments in the field of ZnO-based DSSC devices; synthesis of ZnO nanostructures with variable morphologies, including nanorods, nanofibers, nanotubes, nano-/microflowers, thin sheets, and nanoaggregates; factors that control the growth and morphologies of these nanomaterials; and the role of crystallographic planes for the synthesis of versatile ZnO nanostructures. This review also covers photoelectrode fabrication, DSSC device components, nature and chemical features of the dyes used as photosensitizers, and operational principles. In addition, various photovoltaic parameters such as current density, open-circuit voltage, fill factor, photoconversion efficiency, and factors that influence these parameters for ZnO-based DSSCs are summarized and discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques · ZnO doping and properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (100+)
Show source-provided references
1. Butler MA, Ginley DS (1980) Principles of photoelectrochemical, solar energy conversion. J Mater Sci 15:1–19. doi: 10.1007/BF0055242110.1007/BF00552421 ↗
2. BP Statistical Review of World Energy (2014) London BP. doi: 10.1016/j.egypro.2013.06.17210.1016/j.egypro.2013.06.172 ↗
3. BP (2010) BP Statistical Review of World Energy, London, BP
4. Becquerel AE (1839) Memoire sur les effects d´electriques produits sous l´ influence des rayons solaires. Acad des Sci 9:561–567
5. Fritts C (1885) On the Fritts selenium cell and batteries. Van Nostrands Eng Mag 32:388–395
6. Chapin D, Fuller C, Pearson G (1954) A new silicon p-n junction photocell for converting solar radiation into electrical power. J Appl Phys 25:676–67710.1063/1.1721711 ↗
7. Tsubomura H, Matsumura YNTA (1976) Dye sensitised zinc oxide: aqueous electrolyte: platinum photocell. Nature 261:40210.1038/261402a0 ↗
8. Desilvestro J, Graetzel M, Kavan L et al (1985) Highly efficient sensitization of titanium dioxide. J Am Chem Soc 107:2988–299010.1021/ja00296a035 ↗
9. O’Regan B, Grätzel M (1991) A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films. Nature 353:737–74010.1038/353737a0 ↗
10. Wang ZS, Kawauchi H, Kashima T, Arakawa H (2004) Significant influence of TiO2 photoelectrode morphology on the energy conversion efficiency of N719 dye-sensitized solar cell. Coord Chem Rev 248:1381–138910.1016/j.ccr.2004.03.006 ↗
11. Bach U, Lupo D, Comte P et al (1998) Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies. Nature 395:583–58510.1038/26936 ↗
12. Lee DU, Jang SR, Vittal R et al (2008) CTAB facilitated spherical rutile TiO2 particles and their advantage in a dye-sensitized solar cell. Sol Energy 82:1042–104810.1016/j.solener.2008.04.006 ↗
13. Zhao D, Peng T, Lu L et al (2008) Effect of annealing temperature on the photoelectrochemical properties of dye-sensitized solar cells made with mesoporous TiO2 nanoparticles. J Phys Chem C 112:8486–849410.1021/jp800127x ↗
14. Alivov Y, Fan ZY (2010) Dye-sensitized solar cells using TiO2 nanoparticles transformed from nanotube arrays. J Mater Sci 45:2902–2906. doi: 10.1007/s10853-010-4281-210.1007/s10853-010-4281-2 ↗
15. Chappel S, Zaban A (2002) Nanoporous SnO2 electrodes for dye-sensitized solar cells: improved cell performance by the synthesis of 18 nm SnO2 colloids. Sol Energy Mater Sol Cells 71:141–15210.1016/S0927-0248(01)00050-2 ↗
16. Bandara J, Divarathne CM, Nanayakkara SD (2004) Fabrication of n-p junction electrodes made of n-type SnO2 and p-type NiO for control of charge recombination in dye sensitized solar cells. Sol Energy Mater Sol Cells 81:429–43710.1016/j.solmat.2003.11.027 ↗
17. Quintana M, Marinado T, Nonomura K et al (2009) Organic chromophore-sensitized ZnO solar cells: electrolyte-dependent dye desorption and band-edge shifts. J Photochem Photobiol A Chem 202:159–16310.1016/j.jphotochem.2008.11.024 ↗
18. Green ANM, Palomares E, Haque SA et al (2005) Charge transport versus recombination in dye-sensitized solar cells employing nanocrystalline TiO2 and SnO2 films. J Phys Chem B 109:12525–1253310.1021/jp050145y ↗
19. Qin P, Zhu H, Edvinsson T et al (2008) Design of an organic chromophore for P-type dye-sensitized solar cells. J Am Chem Soc 130:8570–857110.1021/ja8001474 ↗
20. Le Viet A, Jose R, Reddy MV et al (2010) Nb2O5 photoelectrodes for dye-sensitized solar cells: choice of the polymorph. J Phys Chem C 114:21795–2180010.1021/jp106515k ↗
21. Chang H, Kao MJ, Cho KC et al (2011) Integration of CuO thin films and dye-sensitized solar cells for thermoelectric generators. Curr Appl Phys 11:S19–S2210.1016/j.cap.2010.12.039 ↗
22. Habibi MH, Karimi B, Zendehdel M, Habibi M (2013) Fabrication, characterization of two nano-composite CuO–ZnO working electrodes for dye-sensitized solar cell. Spectrochim Acta - Part A Mol Biomol Spectrosc 116:374–38010.1016/j.saa.2013.07.046 ↗
23. Niu H, Zhang S, Ma Q et al (2013) Dye-sensitized solar cells based on flower-shaped α-Fe2O3 as a photoanode and reduced graphene oxide-polyaniline composite as a counter electrode. RSC Adv 3:17228–1723510.1039/c3ra42214c ↗
24. Cavas M, Gupta RK, Al-Ghamdi AA et al (2013) Preparation and characterization of dye sensitized solar cell based on nanostructured Fe2O3. Mater Lett 105:106–10910.1016/j.matlet.2013.04.053 ↗
25. Lee HJ, Yum JH, Leventis HC et al (2008) CdSe quantum dot-sensitized solar cells exceeding efficiency 1% at full-sun intensity. J Phys Chem C 112:11600–1160810.1021/jp802572b ↗
26. Chen J, Song JL, Sun XW et al (2009) An oleic acid-capped CdSe quantum-dot sensitized solar cell. Appl Phys Lett 94:15311510.1063/1.3117221 ↗
27. Cheng L, Hou Y, Zhang B et al (2013) Hydrogen-treated commercial WO3 as an efficient electrocatalyst for triiodide reduction in dye-sensitized solar cells. Chem Commun (Camb) 49:5945–594710.1039/c3cc42206b ↗
28. Zheng H, Tachibana Y, Kalantar-Zadeh K (2010) Dye-sensitized solar cells based on WO3. Langmuir 26:19148–1915210.1021/la103692y ↗
29. Smestad GP, Gratzel M (1998) Demonstrating electron transfer and nanotechnology: a natural dye-sensitized nanocrystalline. J Chem Educ 75:75210.1021/ed075p752 ↗
30. Umar A, Al-Hajry A, Hahn YB, Kim DH (2009) Rapid synthesis and dye-sensitized solar cell applications of hexagonal-shaped ZnO nanorods. Electrochim Acta 54:5358–536210.1016/j.electacta.2009.04.015 ↗
31. Cakir AC, Erten-Ela S (2012) Comparison between synthesis techniques to obtain ZnO nanorods and its effect on dye sensitized solar cells. Adv Powder Technol 23:655–66010.1016/j.apt.2011.08.003 ↗
32. Cai F, Wang J, Yuan Z, Duan Y (2012) Magnetic-field effect on dye-sensitized ZnO nanorods-based solar cells. J Power Sources 216:269–27210.1016/j.jpowsour.2012.05.042 ↗
33. Gonzalez-Valls I, Lira-Cantu M (2010) Effect of testing conditions on the photovoltaic performance of ZnO-based dye sensitized solar cells. Phys Procedia 28–3210.1016/j.phpro.2010.10.007 ↗
34. Chou C-S, Chou F-C, Ding Y-G, Wu P (2012) The effect of ZnO-coating on the performance of a dye-sensitized solar cell. Sol Energy 86:1435–144210.1016/j.solener.2012.02.003 ↗
35. Sponza L, Goniakowski J, Noguera C (2015) Structural, electronic, and spectral properties of six ZnO bulk polymorphs. Phys Rev B Condens Matter Mater Phys 91(7):07512610.1103/PhysRevB.91.075126 ↗
36. Leitner J, Kamrádek M, Sedmidubský D (2013) Thermodynamic properties of rock-salt ZnO. Thermochim Acta 572:1–510.1016/j.tca.2013.08.004 ↗
37. Xie Y, He Y, Irwin PL et al (2011) Antibacterial activity and mechanism of action of zinc oxide nanoparticles against Campylobacter jejuni. Appl Environ Microbiol 77:2325–233110.1128/AEM.02149-10 ↗
38. Ursaki VV, Tiginyanu IM, Zalamai VV et al (2004) Multiphonon resonant Raman scattering in ZnO crystals and nanostructured layers. Phys Rev B Condens Matter Mater Phys 70:15520410.1103/PhysRevB.70.155204 ↗
39. Calleja JM, Cardona M (1977) Resonant Raman scattering in ZnO. Phys Rev B 16:3753–376110.1103/PhysRevB.16.3753 ↗
40. Kumar R, Kumar G, Umar A (2014) Zinc oxide nanomaterials for photocatalytic degradation of methyl orange: a review. Nanosci Nanotechnol Lett 6:631–65010.1166/nnl.2014.1879 ↗
41. Fang X, Peng L, Shang X, Zhang Z (2011) Controlled synthesis of ZnO branched nanorod arrays by hierarchical solution growth and application in dye-sensitized solar cells. Thin Solid Films 519:6307–631210.1016/j.tsf.2011.04.008 ↗
42. Al-Hajry A, Umar A, Hahn YB, Kim DH (2009) Growth, properties and dye-sensitized solar cells-applications of ZnO nanorods grown by low-temperature solution process. Superlattices Microstruct 45:529–53410.1016/j.spmi.2009.02.003 ↗
43. Ke L, Bin Dolmanan S, Shen L et al (2010) Degradation mechanism of ZnO-based dye-sensitized solar cells. Sol Energy Mater Sol Cells 94:323–32610.1016/j.solmat.2009.10.007 ↗
44. Lin LY, Yeh MH, Lee CP et al (2013) Flexible dye-sensitized solar cells with one-dimensional ZnO nanorods as electron collection centers in photoanodes. Electrochim Acta 88:421–42810.1016/j.electacta.2012.10.080 ↗
45. Thambidurai M, Muthukumarasamy N, Velauthapillai D, Lee C (2013) Synthesis of garland like ZnO nanorods and their application in dye sensitized solar cells. Mater Lett 92:104–10710.1016/j.matlet.2012.10.036 ↗
46. Huang QL, Fang L, Chen X, Saleem M (2011) Effect of polyethyleneimine on the growth of ZnO nanorod arrays and their application in dye-sensitized solar cells. J Alloys Compd 509:9456–945910.1016/j.jallcom.2011.07.029 ↗
47. Thambidurai M, Muthukumarasamy N, Velauthapillai D, Lee C (2014) Rosa centifolia sensitized ZnO nanorods for photoelectrochemical solar cell applications. Sol Energy 106:143–15010.1016/j.solener.2014.01.045 ↗
48. Raja M, Muthukumarasamy N, Velauthapillai D et al (2014) Studies on bundle like ZnO nanorods for solar cell applications. Sol Energy 106:129–13510.1016/j.solener.2014.01.043 ↗
49. Meng Y, Lin Y, Lin Y (2014) Electrodeposition for the synthesis of ZnO nanorods modified by surface attachment with ZnO nanoparticles and their dye-sensitized solar cell applications. Ceram Int 40:1693–169810.1016/j.ceramint.2013.07.065 ↗
50. Chae Y, Kim SJ, Kim JH, Kim E (2015) Metal-free organic-dye-based flexible dye-sensitized solar textiles with panchromatic effect. Dye Pigment 113:378–38910.1016/j.dyepig.2014.09.004 ↗
51. Fang X, Li Y, Zhang S et al (2014) The dye adsorption optimization of ZnO nanorod-based dye-sensitized solar cells. Sol Energy 105:14–1910.1016/j.solener.2014.03.039 ↗
52. Song H, Jeong H, Song J et al (2014) Fabrication of glass-free photoelectrodes for dye-sensitized solar cells (DSSCs) by transfer method using ZnO nanorods sacrificial layer. Mater Lett 132:27–3010.1016/j.matlet.2014.06.032 ↗
53. Yun W, Cho IS, Sohn S, Oh S (2012) Effects of heat treatment on the dye adsorption of ZnO nanorods for dye-sensitized solar cells. J Korean Phys Soc 61:1453–145610.3938/jkps.61.1453 ↗
54. Zhu S, Shan L, Tian X et al (2014) Hydrothermal synthesis of oriented ZnO nanorod-nanosheets hierarchical architecture on zinc foil as flexible photoanodes for dye-sensitized solar cells. Ceram Int 40:11663–1167010.1016/j.ceramint.2014.03.173 ↗
55. Pawar RC, Shaikh JS, Tarwal NL et al (2012) Surfactant mediated growth of ZnO nanostructures and their dye sensitized solar cell properties. J Mater Sci Mater Electron 23:349–35510.1007/s10854-011-0385-y ↗
56. Wang CX, Zhang XD, Wang DF et al (2010) Synthesis of nanostructural ZnO using hydrothermal method for dye-sensitized solar cells. Sci China Technol Sci 53:1146–114910.1007/s11431-010-0066-8 ↗
57. Sudhagar P, Kumar RS, Jung JH et al (2011) Facile synthesis of highly branched jacks-like ZnO nanorods and their applications in dye-sensitized solar cells. Mater Res Bull 46:1473–147910.1016/j.materresbull.2011.04.027 ↗
58. Chung J, Lee J, Lim S (2010) Annealing effects of ZnO nanorods on dye-sensitized solar cell efficiency. Phys B Condens Matter 405:2593–259810.1016/j.physb.2010.03.041 ↗
59. Chen W, Zhang H, Hsing IM, Yang S (2009) A new photoanode architecture of dye sensitized solar cell based on ZnO nanotetrapods with no need for calcination. Electrochem Commun 11:1057–106010.1016/j.elecom.2009.03.013 ↗
60. Jana A, Das PP, Agarkar SA, Sujatha Devi P (2014) A comparative study on the dye sensitized solar cell performance of solution processed ZnO. Sol Energy 102:143–15110.1016/j.solener.2014.01.011 ↗
61. Xi Y, Wu WZ, Fang H, Hu CG (2012) Integrated ZnO nanotube arrays as efficient dye-sensitized solar cells. J Alloys Compd 529:163–16810.1016/j.jallcom.2012.02.183 ↗
62. Liu Z, Liu C, Ya J, Lei E (2011) Controlled synthesis of ZnO and TiO2 nanotubes by chemical method and their application in dye-sensitized solar cells. Renew Energy 36:1177–118110.1016/j.renene.2010.09.019 ↗
63. Ameen S, Akhtar MS, Kim YS et al (2011) Influence of seed layer treatment on low temperature grown ZnO nanotubes: performances in dye sensitized solar cells. Electrochim Acta 56:1111–111610.1016/j.electacta.2010.10.085 ↗
64. Chen L, Li X, Qu L et al (2014) Facile and fast one-pot synthesis of ultra-long porous ZnO nanowire arrays for efficient dye-sensitized solar cells. J Alloys Compd 586:766–77210.1016/j.jallcom.2013.10.118 ↗
65. Lupan O, Guérin VM, Tiginyanu IM et al (2010) Well-aligned arrays of vertically oriented ZnO nanowires electrodeposited on ITO-coated glass and their integration in dye sensitized solar cells. J Photochem Photobiol A Chem 211:65–7310.1016/j.jphotochem.2010.02.004 ↗
66. Guérin VM, Rathousky J, Pauporté T (2012) Electrochemical design of ZnO hierarchical structures for dye-sensitized solar cells. Sol Energy Mater Sol Cells 102:8–1410.1016/j.solmat.2011.11.046 ↗
67. Qin Z, Zhang G, Liao Q et al (2012) Influences of low temperature thermal treatment on ZnO nanowire arrays and nanoparticles based flexible dye-sensitized solar cells. Colloids Surfaces A Physicochem Eng Asp 402:127–13110.1016/j.colsurfa.2012.03.037 ↗
68. Fu YS, Sun J, Xie Y et al (2010) ZnO hierarchical nanostructures and application on high-efficiency dye-sensitized solar cells. Mater Sci Eng B Solid-State Mater Adv Technol 166:196–20210.1016/j.mseb.2009.11.023 ↗
69. Kim YT, Park J, Kim S et al (2012) Fabrication of hierarchical ZnO nanostructures for dye-sensitized solar cells. Electrochim Acta 78:417–42110.1016/j.electacta.2012.06.022 ↗
70. Tian Y, Hu C, Wu Q et al (2011) Investigation of the fill factor of dye-sensitized solar cell based on ZnO nanowire arrays. Appl Surf Sci 258:321–32610.1016/j.apsusc.2011.08.058 ↗
71. Nayeri FD, Soleimani EA, Salehi F (2013) Synthesis and characterization of ZnO nanowires grown on different seed layers: the application for dye-sensitized solar cells. Renew Energy 60:246–25510.1016/j.renene.2013.05.006 ↗
72. Suh DI, Lee SY, Kim TH et al (2007) The fabrication and characterization of dye-sensitized solar cells with a branched structure of ZnO nanowires. Chem Phys Lett 442:348–35310.1016/j.cplett.2007.05.093 ↗
73. Li S, Zhang X, Jiao X, Lin H (2011) One-step large-scale synthesis of porous ZnO nanofibers and their application in dye-sensitized solar cells. Mater Lett 65:2975–297810.1016/j.matlet.2011.06.073 ↗
74. Zhu S, Chen X, Zuo F et al (2013) Controllable synthesis of ZnO nanograss with different morphologies and enhanced performance in dye-sensitized solar cells. J Solid State Chem 197:69–7410.1016/j.jssc.2012.09.001 ↗
75. Gao R, Liang Z, Tian J et al (2013) ZnO nanocrystallite aggregates synthesized through interface precipitation for dye-sensitized solar cells. Nano Energy 2:40–4810.1016/j.nanoen.2012.07.009 ↗
76. Guo H, He X, Hu C et al (2014) Effect of particle size in aggregates of ZnO-aggregate-based dye-sensitized solar cells. Electrochim Acta 120:23–2910.1016/j.electacta.2013.12.099 ↗
77. Jia W, Dang S, Liu H et al (2013) Submicrometer-scale ZnO composite aggregate arrays photoanodes for dye-sensitized solar cells. J Mater Sci Technol 29:415–41810.1016/j.jmst.2013.02.004 ↗
78. Zheng YZ, Ding H, Liu Y et al (2014) In situ hydrothermal growth of hierarchical ZnO nanourchin for high-efficiency dye-sensitized solar cells. J Power Sources 254:153–16010.1016/j.jpowsour.2013.12.123 ↗
79. Liu Z, Li Y, Liu C et al (2011) Performance of ZnO dye-sensitized solar cells with various nanostructures as anodes. Solid State Sci 13:1354–135910.1016/j.solidstatesciences.2011.04.005 ↗
80. Bu IYY, Cole MT (2013) One-pot synthesis of intercalating ZnO nanoparticles for enhanced dye-sensitized solar cells. Mater Lett 90:56–5910.1016/j.matlet.2012.09.026 ↗
81. Lu LL, Li RJ, Fan K, Peng TY (2010) Effects of annealing conditions on the photoelectrochemical properties of dye-sensitized solar cells made with ZnO nanoparticles. Sol Energy 84:844–85310.1016/j.solener.2010.02.010 ↗
82. Li H, Bai J, Feng B et al (2013) Dye-sensitized solar cells with a tri-layer ZnO photo-electrode. J Alloys Compd 578:507–51110.1016/j.jallcom.2013.06.191 ↗
83. Rani S, Suri P, Shishodia PK, Mehra RM (2008) Synthesis of nanocrystalline ZnO powder via sol-gel route for dye-sensitized solar cells. Sol Energy Mater Sol Cells 92:1639–164510.1016/j.solmat.2008.07.015 ↗
84. Al-Kahlout A (2015) Thermal treatment optimization of ZnO nanoparticles-photoelectrodes for high photovoltaic performance of dye-sensitized solar cells. J Assoc Arab Univ Basic Appl Sci 17:66–72
85. Devabharathi V, Palanisamy KL, Meenakshi Sundaram N (2014) Influence of pH on the performance of ZnO nanocrystal based dye sensitized solar cells. Superlattices Microstruct 75:99–10410.1016/j.spmi.2014.07.028 ↗
86. Patra AK, Dutta A, Bhaumik A (2014) Self-assembled ultra small ZnO nanocrystals for dye-sensitized solar cell application. J Solid State Chem 215:135–14210.1016/j.jssc.2014.03.036 ↗
87. Xu J, Fan K, Shi W et al (2014) Application of ZnO micro-flowers as scattering layer for ZnO-based dye-sensitized solar cells with enhanced conversion efficiency. Sol Energy 101:150–15910.1016/j.solener.2013.12.039 ↗
88. Umar A, Akhtar MS, Al-Hajry A et al (2012) Hydrothermally grown ZnO nanoflowers for environmental remediation and clean energy applications. Mater Res Bull 47:2407–241410.1016/j.materresbull.2012.05.028 ↗
89. Dunkel C, Wark M, Oekermann T et al (2013) Electrodeposition of zinc oxide on transparent conducting metal oxide nanofibers and its performance in dye sensitized solar cells. Electrochim Acta 90:375–38110.1016/j.electacta.2012.12.048 ↗
90. Parthiban R, Balamurugan D, Jeyaprakash BG (2015) Dye-sensitized solar cell based on spray deposited ZnO thin film: performance analysis through DFT approach. Spectrochim Acta Part A Mol Biomol Spectrosc 136:986–99210.1016/j.saa.2014.09.121 ↗
91. Lin Y, Yang J, Meng Y (2013) Nanostructured ZnO thin films by SDS-assisted electrodeposition for dye-sensitized solar cell applications. Ceram Int 39:5049–505210.1016/j.ceramint.2012.11.103 ↗
92. Kushwaha S, Bahadur L (2011) Characterization of some metal-free organic dyes as photosensitizer for nanocrystalline ZnO-based dye sensitized solar cells. Int J Hydrogen Energy 36:11620–1162710.1016/j.ijhydene.2011.06.018 ↗
93. Zi M, Zhu M, Chen L et al (2014) ZnO photoanodes with different morphologies grown by electrochemical deposition and their dye-sensitized solar cell properties. Ceram Int 40:7965–797010.1016/j.ceramint.2013.12.146 ↗
94. Suresh S, Pandikumar A, Murugesan S et al (2011) Photovoltaic performance of solid-state solar cells based on ZnO nanosheets sensitized with low-cost metal-free organic dye. Sol Energy 85:1787–179310.1016/j.solener.2011.04.016 ↗
95. Navaneethan M, Archana J, Arivanandhan M, Hayakawa Y (2012) Functional properties of amine-passivated ZnO nanostructures and dye-sensitized solar cell characteristics. Chem Eng J 213:70–7710.1016/j.cej.2012.10.001 ↗
96. Baviskar P, Gore R, Ennaoui A, Sankapal B (2014) Cactus architecture of ZnO nanoparticles network through simple wet chemistry: efficient dye sensitized solar cells. Mater Lett 116:91–9310.1016/j.matlet.2013.10.106 ↗
97. Giannouli M, Spiliopoulou F (2012) Effects of the morphology of nanostructured ZnO films on the efficiency of dye-sensitized solar cells. Renew Energy 41:115–12210.1016/j.renene.2011.10.010 ↗
98. Deng J, Zheng YZ, Hou Q et al (2011) Solid-state dye-sensitized hierarchically structured ZnO solar cells. Electrochim Acta 56:4176–418010.1016/j.electacta.2011.01.099 ↗
99. Mou J, Zhang W, Fan J et al (2011) Facile synthesis of ZnO nanobullets/nanoflakes and their applications to dye-sensitized solar cells. J Alloys Compd 509:961–96510.1016/j.jallcom.2010.09.148 ↗
100. Umar A (2009) Growth of comb-like ZnO nanostructures for Dye-sensitized solar cells applications. Nanoscale Res Lett 4:1004–100810.1007/s11671-009-9353-3 ↗