Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 2, Pages 1092-1099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am404638e
Keywords
polymer solar cells; graphene; quantum dots; cesium carbonate; cathode buffer; stability
Funding
- Agency of Science, Technology and Research (A*Star), Singapore, under SERC [122 020 3053]
- Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE)
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Solution processable inverted bulk heterojunction (BHJ) polymer solar cells (PSCs) are promising alternatives to conventional silicon solar cells because of their low cost roll-to-roll production and flexible device applications. In this work, we demonstrated that Cs2CO3 functionalized graphene quantum dots (GQDs-Cs2CO3) could be used as efficient electron-selective layers in inverted PSCs. Compared with Cs2CO3 buffered devices, the GQDs-Cs2CO3 buffered devices show 56% improvement in power conversion efficiency, as well as 200% enhancement in stability, due to the better electron-extraction, suppression of leakage current, and inhibition of Cs+ ion diffusion at the buffer/polymer interface by GQDs-Cs2CO3. This work provides a thermal-annealing-free, solution-processable method for fabricating electron-selective layer in inverted PSCs, which should be beneficial for the future development of high performance all-solution-processed or roll-to-roll processed PSCs.
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