Enhanced Photovoltaic Performance of Inverted Polymer Solar Cells utilizing Versatile Chemically Functionalized ZnO@graphene Quantum dot Monolayer
- Enhanced Photovoltaic Performance of Inverted Polymer Solar Cells utilizing Versatile Chemically Functionalized ZnO@graphene Quantum dot Monolayer
- 문병준; 이규승; 심재호; 박수형; 김세호; 배수강; 박민; 이창렬; 최원국; 이연진; 황준연; 손동익
- polymer solar cells; charge
transfer; quenching; ZnO@graphene quantum dots; chemically functionalization; monolayer; surfacemodifiers
- Issue Date
- Nano energy
- VOL 20, 221-232
- Recently, interfacial engineering approaches as an efficient strategy for improving the power conversion efficiencies (PCEs) of inverted polymer solar cells (iPSCs) has attracted considerable attention. Among various efficient solutions, solution-processed metal-oxide films prepared from metal oxide sol–gel precursors (or nanoparticles) and polymer surface modifiers are typically used as electron selective interfaces in the inverted cell geometry. To present a more effective strategy for surpassing the limitations of traditional methods, such as an unintended increase in series or contact resistance by incompatibility at the organic/inorganic interface, inherently insulating nature of non-conjugated surface modifiers and oxygen adsorption (or photo-induced doping) of metal-oxide layer, we synthesize chemically surface-modified ZnO@graphene core–shell type quantum dots (ZGQDs) with well-characterization of the chemical, optical and electrical properties, and fabricate iPSCs consisting of ITO/PEIE/ZGQD-OAs/photoactive layer/MoO3/Ag. The mono-layered QDs play the multi-functional role as surface modifier, sub-photosensitizer and electron transport layer. Using this effective approach, we achieve the highest conversion efficiency of ~10.3% resulting from improved interfacial properties and efficient charge transfer based on static quenching and charge transfer reaction from ZnO to graphene nanosheets (with drastically reduced τavg (~ 60 ps)), which is verified by various analysis tools.
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