The Role of the Electron Transport Layer in the Degradation of Organic Photovoltaic Cells
Source abstract
Abstract
The performance of the electron transport layer (ETL) plays a critical role in extending the operational lifespan of organic photovoltaic devices. ZnO is an excellent electron transport layer used in the printable organic photovoltaic cells. A comparison of Ca and ZnO as the ETL in encapsulated bulk heterojunction OPV devices has been undertaken with the device stability dependence on light soaking, temperature, irradiance, and thermal cycling recorded. It was observed that the OPV devices using Ca ETL decayed faster than the ZnO ETL devices under the same light illumination. The degradation in a Ca ETL device is ascribed to the formation of an insulating calcium oxide layer at the ETL interfaces. Photoluminescence (PL) spectroscopy revealed a higher PL signal for the degraded Ca ETL devices compared to the ZnO ETL devices. Power conversion efficiency (PCE) of the ZnO ETL devices was found to be much more stable than the Ca devices. The PCE for ZnO ETL devices still retained 40% of their initial value while the Ca ETL devices failed completely over the period of 18 days in the study, leading to a clear outcome of the study.
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Research context
OpenAlex topics: Organic Electronics and Photovoltaics · Thin-Film Transistor Technologies · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center of Organic Electronics, University of Newcastle, Newcastle 2308, Australia
Funding
University of Newcastle through the Centre for Organic Electronics
References (46)
Show source-provided references
1. Messenger, R., Goswami, D.Y., and Upadhyaya, H. (2007). Photovoltaics Fundamentals, Technology and Application. Handbook of Energy Efficiency and Renewable Energy (Mechanical Engineering), CRC Press.10.1201/9781420003482.ch23 ↗
2. Gupta, M.C., and Ballato, J. (2007). Photovoltaics devices. The Handbook of Photonics, CRC Press. [2nd ed.].
3. A review of solar photovoltaic technologies10.1016/j.rser.2010.11.032 ↗
4. Agency, I.E. (2017). Market Report Series: Renewables 2017: Analysis and Forecasts to 2022, International Energy Agency.
5. Evolution of defects during the degradation of metal halide perovskite solar cells under reverse bias and illumination10.1038/s41560-021-00949-9 ↗
6. Review of photovoltaic technologies10.1016/j.rser.2011.01.004 ↗
7. Modeling low cost hybrid tandem photovoltaics with the potential for efficiencies exceeding 20%10.1039/c2ee23073a ↗
8. Roll-to-roll sputter coating of aluminum cathodes for large-scale fabrication of organic photovoltaic devices10.1002/ente.201402174 ↗
9. 10.2% power conversion efficiency polymer tandem solar cells consisting of two identical sub-cells10.1002/adma.201300964 ↗
10. Recent development of graphene materials applied in polymer solar cell10.1016/j.rser.2014.11.040 ↗
11. Overcoming the scaling lag for polymer solar cells10.1016/j.joule.2017.08.002 ↗
12. Organic and solution-processed tandem solar cells with 17.3% efficiency10.1126/science.aat2612 ↗
13. Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages10.1038/s41467-019-10351-5 ↗
14. A nuanced approach for assessing OPV materials for large scale applications10.1039/C9SE01149H ↗
15. A low-cost mixed fullerene acceptor blend for printed electronics10.1039/C6TA04191D ↗
16. Levelised cost of electricity for organic photovoltaics10.1016/j.solmat.2014.10.043 ↗
17. Promising long-term stability of encapsulated ITO-free bulk-heterojunction organic solar cells under different aging conditions10.1016/j.solmat.2014.07.004 ↗
18. Inverted polymer solar cells using inkjet printed ZnO as electron transport layer: Characterization and degradation study10.1109/JEDS.2020.2968001 ↗
19. Stability of polymer solar cells10.1002/adma.201104187 ↗
20. Comparing the degradation of organic photovoltaic devices under ISOS testing protocols10.1016/j.solmat.2015.12.032 ↗
21. Burn-in free nonfullerene-based organic solar cells10.1002/aenm.201700770 ↗
22. Improved efficiency of organic solar cells using Au NPs incorporated into PEDOT: PSS buffer layer10.1063/1.4995803 ↗
23. UV degradation of the interface between perovskites and the electron transport layer10.1039/C9RA10960A ↗
24. Indoor organic photovoltaics: Optimal cell design principles with synergistic parasitic resistance and optical modulation effect10.1002/aenm.202003103 ↗
25. Muhammad Ahsan Saeed, Sun Cheng b, Swarup Biswas c, Sang Hyeon Kim d, Soon-Ki Kwon e
26. Progress in understanding degradation mechanisms and improving stability in organic photovoltaics10.1002/adma.201603940 ↗
27. Elastomeric indoor organic photovoltaics with superb photothermal endurance10.1002/adfm.202201921 ↗
28. Air stable polymer photovoltaics based on a process free from vacuum steps and fullerenes10.1016/j.solmat.2008.01.013 ↗
29. Flexible encapsulation for organic solar cells
30. An economic LED solar simulator design10.1109/JPHOTOV.2022.3143460 ↗
31. Modular LED arrays for large area solar simulation10.1002/pip.3072 ↗
32. Al-Ahmad, A.Y., Vaughan, B., Holdsworth, J., Zhou, X., Belcher, W., and Dastoor, P. (2008, January 25–29). LED Configuration for Large Area Solar Simulator Applications. Proceedings of the International Conference on Nanoscience and Nanotechnology, Wollongong, Australia.
33. Al-Ahmad, A.Y.T. (2019). Design and Construction of a Novel Large Area LED Solar Simulator for Photovoltaic Cell Characterization. [Ph.D. Thesis, The University of Newcastle].
34. (2010). Standard Specification for Solar Simulation for Terrestrial Photovoltaic Testing (Standard No. ASTM E927-10).
35. Consensus stability testing protocols for organic photovoltaic materials and devices10.1016/j.solmat.2011.01.036 ↗
36. Optical and electrical properties of efficiency enhanced polymer solar cells with Au nanoparticles in a PEDOT–PSS layer10.1039/c1jm12820e ↗
37. Role of stabilizing surfactants on capacitance, charge, and ion transport in organic nanoparticle-based electronic devices10.1021/acsami.8b19820 ↗
38. Influence of energetic disorder on exciton lifetime and photoluminescence efficiency in conjugated polymers10.1021/acs.jpcb.6b11813 ↗
39. Interface investigation and engineering–achieving high performance polymer photovoltaic devices10.1039/b925382c ↗
40. Effect of metal films on the photoluminescence and electroluminescence of conjugated polymers10.1103/PhysRevB.56.1893 ↗
41. Effect of annealing of poly (3-hexylthiophene)/fullerene bulk heterojunction composites on structural and optical properties10.1016/j.tsf.2005.09.093 ↗
42. Manipulating regioregular poly (3-hexylthiophene):[6, 6]-phenyl-C 61-butyric acid methyl ester blends—route towards high efficiency polymer solar cells10.1039/b703075b ↗
43. Migration-assisted energy transfer at conjugated polymer/metal interfaces10.1103/PhysRevB.72.161401 ↗
44. PL and EL quenching due to thin metal films in conjugated polymers and polymer LEDs10.1016/S0379-6779(97)80245-7 ↗
45. Exciton diffusion in organic semiconductors10.1039/C5EE00925A ↗
46. Optical determination of Shockley-Read-Hall and interface recombination currents in hybrid perovskites10.1038/srep44629 ↗