Effects of graphene quantum dots interlayer on performance of ZnO-based photodetectors
Source abstract
Abstract
Abstract In this paper, the effects of inserting graphene quantum dots (GQDs) as an interlayer between two zinc oxide (ZnO) thin films is studied comprehensively. This kind of sandwich structure offers various advantages over similar structures modified using GQDs. It is obvious that exploiting GQDs properties can thoroughly modify the optical and electrical properties of ZnO thin films. Due to the two Schottky barriers created at the interfaces, low amounts of dark current (about 127 nA) and a high signal to noise ratio (SNR) of 3.52 × 102 is measured for a sandwich structure comprised of ZnO/GQDs/ZnO (ZGZ) layers. Furthermore, the high-speed photodetector, referred in this paper, responded at least 23 times faster compared to pure ZnO (ZZ), resulting in 370 μs and 8.8 ms of response time for ZGZ and ZZ, respectively. The high amounts of responsivity and detectivity achieved by this visible-blind photodetector are other unique features this form of sandwich hybrid structures benefit from. Four orders of magnitudes enhancement in detectivity accomplished by inserting a thin film of GQDs.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Carbon and Quantum Dots Applications · Graphene research and applications · ZnO doping and properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. Electric field effect in atomically thin carbon films10.1126/science.1102896 ↗
2. Development of a seedless floating growth process in solution for synthesis of crystalline ZnO micro/nanowire arrays on graphene: towards high-performance nanohybrid ultraviolet photodetectors10.1002/adfm.201300468 ↗
3. Controlled growth of multilayer, few-layer, and single-layer graphene on metal substrates10.1021/jp109002p ↗
4. Lotya · Am. Chem. Soc. · 2009 · 131 · 361110.1021/ja807449u ↗
5. Stepwise reduction of graphene oxide (GO) and its effects on chemical and colloidal properties10.1038/s41598-018-28353-6 ↗
6. Carbon deposition from aromatic solvents onto active intact 3d metal surface at ambient conditions10.1021/la4049709 ↗
7. Thermal analysis study of the growth kinetics of carbon nanotubes and epitaxial graphene layers on them10.1021/jp901245u ↗
8. Recent advances in graphene quantum dots for sensing10.1016/j.mattod.2013.10.020 ↗
9. Graphene quantum dots and their possible energy applications: a review10.1016/j.cap.2016.03.026 ↗
10. Graphene quantum dots from chemistry to applications10.1016/j.mtchem.2018.09.007 ↗
11. ZnO/graphene quantum dot solid-state solar cell10.1021/jp302992k ↗
12. An electrochemical avenue to green-luminescent graphene quantum dots as potential electron-acceptors for photovoltaics10.1002/adma.201003819 ↗
13. Synthesis of large, stable colloidal graphene quantum dots with tunable size10.1021/ja1009376 ↗
14. Surface chemistry routes to modulate the photoluminescence of graphene quantum dots: from fluorescence mechanism to up-conversion bioimaging applications10.1002/adfm.201201499 ↗
15. Chaotic Dirac billiard in graphene quantum dots10.1126/science.1154663 ↗
16. Large, solution-processable graphene quantum dots as light absorbers for photovoltaics10.1021/nl101060h ↗
17. Photodetectors based on two-dimensional layered materials beyond graphene10.1002/adfm.201603886 ↗
18. A comprehensive optimization of aluminum concentration in ZnO nanocrystals by novel simple methods10.1007/s13391-015-5075-0 ↗
19. A method for optimizing the electrical conductivity of Al:ZnO TCO films10.1016/j.matlet.2017.02.079 ↗
20. Blue luminescent graphene quantum dots and graphene oxide prepared by tuning the carbonization degree of citric acid10.1016/j.carbon.2012.06.002 ↗
21. Kitai · 2008 · 27
22. Dirac cones reshaped by interaction effects in suspended graphene10.1038/nphys2049 ↗
23. Electric-field dependence of the effective dielectric constant in graphene10.1021/nl303611v ↗
24. Sol-gel derived AZO thin film with unusual narrow dual emission10.1016/j.jlumin.2014.03.062 ↗
25. Enhanced performance in Al-doped ZnO based transparent flexible transparent thin-film transistors due to oxygen vacancy in ZnO film with Zn–Al–O interfaces fabricated by atomic layer deposition10.1021/acsami.7b02609 ↗
26. One-step synthesis, structural and optical characterization of self-assembled ZnO nanoparticle clusters with quench-induced defects10.1166/sam.2014.1881 ↗
27. Role of C – N configurations in the photoluminescence of graphene quantum dots synthesized by a hydrothermal route10.1038/srep21042 ↗
28. Fabrication of high-performance UVC photodiodes by Al+3 ion adjustment in AZO/Si Heterostructures10.1016/j.optmat.2018.05.010 ↗
29. Photoluminescence mechanism in graphene quantum dots: quantum confinement effect and surface/edge state10.1016/j.nantod.2016.12.006 ↗
30. Electrochemical method to prepare graphene quantum dots and graphene oxide quantum dots10.1021/acsomega.7b01539 ↗
31. Graphene quantum dots electrochemistry and sensitive electrocatalytic glucose sensor development10.3390/nano7100301 ↗
32. Nanophotonics: optoelectronic devices based on hybrid quantum dots and carbon nanomaterials
33. Phenomenal ultraviolet photoresponsivity and detectivity of graphene dots immobilized on zinc oxide nanorods10.1021/acsami.6b13037 ↗
34. Highly concentrated ZnO sol with ultra-strong green emission10.1016/j.matlet.2013.08.035 ↗
35. Low temperature-processed ZnO thin films for p–n junction-based visible-blind ultraviolet photodetectors10.1039/C8RA07312K ↗
36. Photoluminescence in graphene quantum dots10.1016/j.nantod.2016.12.006 ↗
37. Photo-induced doping in GaN Epilayers with graphene quantum dots10.1038/srep23260 ↗
38. Semiconducting graphene: converting graphene from semimetal to semiconductor10.1039/c2nr32453a ↗
39. Experimental and theoretical analysis of ZnO/Au/ZnO transparent conducting thin films10.1016/j.vacuum.2015.06.015 ↗
40. High-performance ultraviolet photodetector based on graphene quantum dots decorated ZnO nanorods/GaN film isotype heterojunctions10.1186/s11671-018-2672-5 ↗