Hydrazide Derivatives for Defect Passivation in Pure CsPbI3 Perovskite Solar Cells

Yuhang Che; Zhike Liu; Yuwei Duan; Jungang Wang; Shaomin Yang; Dongfang Xu; Wanchun Xiang; Tao Wang; Ningyi Yuan; Jianning Ding; Shengzhong Frank Liu

doi:10.1002/anie.202205012

Hydrazide Derivatives for Defect Passivation in Pure CsPbI₃ Perovskite Solar Cells

Angew Chem Int Ed Engl. 2022 Aug 15;61(33):e202205012. doi: 10.1002/anie.202205012. Epub 2022 Jul 8.

Authors

Affiliations

¹ Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy, Technology School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
² Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China.
³ Dalian National Laboratory for Clean Energy iChEM, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian, 116023, China.

PMID: 35648576
DOI: 10.1002/anie.202205012

Abstract

All-inorganic CsPbI₃ perovskite presents preeminent chemical stability and a desirable band gap as the front absorber for perovskite/silicon tandem solar cells. Unfortunately, CsPbI₃ perovskite solar cells (PSCs) still show low efficiency due to high density of defects in solution-prepared CsPbI₃ films. Herein, three kinds of hydrazide derivatives (benzoyl hydrazine (BH), formohydrazide (FH) and benzamide (BA)) are designed to reduce the defect density and stabilize the phase of CsPbI₃ . Calculation and characterization results corroborate that the carboxyl and hydrazine groups in BH form strong chemical bonds with Pb²⁺ ions, resulting in synergetic double coordination. In addition, the hydrazine group in the BH also forms a hydrogen bond with iodine to assist the coordination. Consequently, a high efficiency of 20.47 % is achieved, which is the highest PCE among all pure CsPbI₃ -based PSCs reported to date. In addition, an unencapsulated device showed excellent stability in ambient air.

Keywords: CsPbI3; Defect Passivation; Hydrazide; Perovskite; Solar Cells.

Abstract

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