Abstract
Carbon-based organic-inorganic perovskite solar cells (C-PSCs) are low-cost photovoltaic cells. However, the carrier recombination caused by interface defects and the mismatched interface energy level limits the further improvement of the efficiency of C-PSCs. In this work, SmCl3 was introduced as a “double-sided” modifier to achieve interfacial modification. After modified, Cl− passivated the oxygen vacancy defects on the TiO2 surface. Meanwhile, Sm3+ was diffused into the perovskite interface in the form of a concentration gradient, which balanced the non-coordinated Pb2+ and improved the energy level arrangement. Due to good interfacial contact, the reduced interfacial non-radiative recombination, and rapid charge extraction and transport, the optimized C-PSCs efficiency was increased from 11.03 to 13.4%. In addition, the unencapsulated champion PSC remained stable for long-term stability after the sustained attack for 800 h at room temperature of 20% RH. This work proposed a straightforward interface modification strategy to improve the efficiency of C-PSCs.
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This work was supported by the National Natural Science Foundation of China [51772178].
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Yao Guo, Changqing Liu, Luyao Li, Dejiang Fan, Jianfeng Huang, Qinghua Zhang, Tao Wang, Yufei Chen. The first draft of the manuscript was written by Lixiong Yin and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Yin, L., Guo, Y., Liu, C. et al. Two birds with one stone: SmCl3 modified TiO2/perovskite interface to enhance the performance of carbon-based perovskite solar cell. J Mater Sci: Mater Electron 35, 538 (2024). https://doi.org/10.1007/s10854-024-12299-9
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DOI: https://doi.org/10.1007/s10854-024-12299-9