Efficient planar heterojunction perovskite solar cells with Li-doped compact TiO2 layer. (January 2017)

• Record Type: Journal Article
• Authors: Liu, Detao; Li, Shibin; Zhang, Peng; Wang, Yafei; Zhang, Rui; Sarvari, Hojjatollah; Wang, Feng; Wu, Jiang; Wang, Zhiming; Chen, Zhi David
• Is Part Of: Nano energy. Volume 31(2017:Jan.)
• Page Start: 462
• Page End: 468
• Publication Date: 2017-01
• Subjects: Li-doping TiO2 -- Planar heterojunction perovskite solar cells -- Less- hysteresis -- CH3NH3PbI3; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.11.028
• Languages: English
• ISSNs: 2211-2855

Abstract

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 TiO2 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 TiO2 based planar heterojunction PSCs exhibit negligible hysteretic J-V behavior. Comparing with the undoped compact TiO2 based PSCs, the power conversion efficiency (PCE) of the Li-doped compact TiO2 film based PSCs is improved from 14.2% to 17.1%. Fabrication of highly efficient planar PSCs provides a pathway for commercialization of PSCs. Graphical abstract: The defects of compact TiO2 layer are passivated by the doping of lithium. Compared with the undoped compact TiO2 based planar perovskite solar cells (PSCs), the power conversion efficiency of the Li-doped compact TiO2 film based planar PSCs is improved from 14.2% to 17.1%. Highlights: Li-doped compact TiO2 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.