Importance of Functional Groups in Cross-Linking Methoxysilane Additives for High-Efficiency and Stable Perovskite Solar Cells
journal contributionposted on 21.08.2019, 12:14 by Lin Xie, Jiangzhao Chen, Parth Vashishtha, Xing Zhao, Gwang Su Shin, Subodh G. Mhaisalkar, Nam-Gyu Park
Here we report an efficient and reproducible multifunctional additive engineering strategy via methoxysilane cross-linking agents functionalized by the different terminal group, moderate electron-donating −SH, weak electron-donating −CH3, or strong electron-withdrawing −CN, into a PbI2 precursor solution. The power conversion efficiency (PCE) is increased from 18.4 to 20.8% after introduction of (3-mercaptopropyl)trimethoxysilane (MPTS) containing a −SH group as a consequence of improved voltage and current density, while 3-cyanopropyltriethoxysilane (CPTS) containing a −CN group deteriorates the overall photovoltaic performance. Moreover, −SH in MPTS is found to passivate defects effectively through a Lewis acid–base interaction with PbI2, resulting in a larger grain size and a longer carrier lifetime. Owing to the formation of a cross-linking siloxane network as a protective layer on the grain boundary, the thermal and moisture stability of the device are improved remarkably. The present work provides a guideline for multifunctional additive engineering for the purpose of simultaneous achievement of a high PCE and long-term stability.
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methoxysilane cross-linking agents functionalizedCPTSmoisture stabilitypassivate defectsmultifunctional additive engineeringpower conversion efficiencyPCEPbI 2electron-donatingFunctional Groupscarrier lifetimeCross-Linking Methoxysilane Additivesmultifunctional additive engineering strategyterminal groupcross-linking siloxane networkCHMPTSCNStable Perovskite Solar CellsSHPbI 2 precursor solutiongrain boundaryphotovoltaic performancegrain size