Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Carbon-based perovskite solar cells (C-PSCs) are emerging as low-cost stable photovoltaics. However, their power conversion efficiency (PCE) still lags behind that of devices based on Au or Ag as current collector. Here we introduce an innovative modular PSC design using a carbon back electrode whose sheet resistance and thickness is greatly reduced by covering it with another carbon-coated FTO glass that is applied under pressure. We show that these two individual elements can be assembled and separated repeatedly. Moreover, among the various commercial carbon sources (carbon black, graphite sheet, and graphene), graphene exhibits the best overall performance, showing the crucial importance of graphene as charge collector. A power conversion efficiency (PCE) of 18.65% was achieved for graphene-based PSCs (G-PSCs), which was among the highest efficiency ever reported so far for C-PSCs. Moreover, the optimized devices without encapsulation retained 90% of their initial PCE after aging at elevated temperature of 85 oC for 1000 h. Remarkably, the G-PSCs shows significant structural flexibility, there is negligible degradation in PCE after repeated disassembling and assembling for more than 500 cycles. Our system provides a promising prospect for facile repair and maintenance of PSCs via modular interconnections, related strategies may be extended to other devices.
This work was financially supported by the National Natural Science Foundation of China (Grant No. 51773025, 51872036 and 51605079), Dalian science and technology innovation fund (2018J12GX033), the Fundamental Research Funds for the Central Universities of China (Grant No. DUT18ZD208 and DUT19LAB07), and the GRAPHENE Flagship Core 2 project supported by the European Commission H2020 Programme under contract 785219. We also give our thanks to Dr. Ke Zhou from Xiamen University (Department of Chemistry & College of Chemistry and Chemical Engineering) for her help in characterizations.
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