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Interfacial Chemical Bridge Constructed by Zwitterionic Sulfamic Acid for Efficient and Stable Perovskite Solar Cells

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journal contribution
posted on 17.03.2020, 18:09 by Haoran Xia, Xing Li, Jiyu Zhou, Boxin Wang, Yanmeng Chu, Yanxun Li, Guangbao Wu, Dongyang Zhang, Baoda Xue, Xuning Zhang, Yue Hu, Huiqiong Zhou, Yuan Zhang
A simple-structure zwitterion of sulfamic acid (+H3N–SO3, SA) is introduced to construct an effective chemical bridge between SnO2 and a perovskite layer through a coordination bond via the -SO3 anion for remedying the oxygen vacancies of SnO2 and meanwhile to passivate charged defects of the perovskite through electrostatic interaction via the -NH3+ cation. The introduced SA results in high-quality perovskite films with large grain size, due to the better wettability for perovskite solution. Consequently, the SA-modified solar cell generates an enhanced efficiency from 18.2% to 20.4% with negligible hysteresis. Remarkably, the unsealed device with SA modification also exhibits considerably improved stability.