Efficient planar heterojunction perovskite solar cells with Li-doped compact TiO2 layer
Abstract Perovskite solar cells (PSCs) have been developed rapidly in recent time, and efficient planar PSCs are regarded as the most promising alternative to the Si solar cells. In this study, we demonstrated that Li-doping of compact TiO 2 can reduce the density of electron traps and increase the conductivity of the electron transport layer (ETL) of PSCs. Due to the improved electronic property of ETL, the Li-doped compact TiO 2 based planar heterojunction PSCs exhibit negligible hysteretic J-V behavior. Comparing with the undoped compact TiO 2 based PSCs, the power conversion efficiency (PCE) of the Li-doped compact TiO 2 film based PSCs is improved from 14.2% to 17.1%. Fabrication of highly efficient planar PSCs provides a pathway for commercialization of PSCs. Highlights Li-doped compact TiO 2 films based planar PSCs exhibit hysteretic-free J-V behavior. Enhanced electronic collections improve PCE of planar PSCs to 17.3%. Obtained efficient planar PSCs show a potential approach to commercialize PSCs. Graphical abstract The defects of compact TiO 2 layer are passivated by the doping of lithium. Compared with the undoped compact TiO 2 based planar perovskite solar cells (PSCs), the power conversion efficiency of the Li-doped compact TiO 2 film based planar PSCs is improved from 14.2% to 17.1%. [DISPLAY OMISSION]
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