Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.067
Publication date: 27th October 2017
We report high performance of wide bandgap (WBG) perovskite device using hybrid halide to widen the bandgap to 1.72 eV by tuning the bromine composition in perovskite. We employed various C60 chained electron transport layers (ETLs) on wide bandgap perovskite-based solar cell devices. The WBG perovskite device tuning with C60-fused N-methylpyrrolidine-meta-C12 phenyl (C60MC12) demonstrated an enhanced efficiency of 16.7% with promising open circuit voltage of 1.24 V. The increase in device efficiency was found to be governed by high interface quality and reduction of energy disorder of wide bandgap perovskite layer with C60MC12 as carrier transport layer. We observed that the long-chain alkyl-substituted C60MC12 has better crystallinity over PCBM which is favorable for efficient carrier transport and formation of better interface with perovskite layer. The analysis of J-V characteristics and capacitance spectroscopy revealed impacts on optoelectronic properties of WBG perovskite devices with PCBM and C60MC12 as an ETL. These results corroborate that WBG perovskite device coupled with proper carrier transport layer is crucial to achieve high-efficiency top cell for tandem device integrated with silicon solar cell.
Keywords: Wide bandgap perovskite, ETLs, interface quality, efficiency
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