Robust Self-Assembled Molecular Passivation for High-Performance Perovskite Solar Cells

Haodan Guo; Yanyan Fang; Hong-Bo Cheng; Jinpeng Wu; Yan Lei; Shumao Wang; Xiangrong Li; Yuhua Dai; Wanchun Xiang; Ding-Jiang Xue; Yuan Lin; Anders Hagfeldt

doi:10.1002/anie.202204148

Robust Self-Assembled Molecular Passivation for High-Performance Perovskite Solar Cells

Angew Chem Int Ed Engl. 2022 Jun 20;61(25):e202204148. doi: 10.1002/anie.202204148. Epub 2022 Apr 21.

Authors

Haodan Guo^{1

2}, Yanyan Fang^{1

2}, Hong-Bo Cheng³, Jinpeng Wu^{1

2}, Yan Lei^{1

2}, Shumao Wang^{1

4}, Xiangrong Li^{1

2}, Yuhua Dai⁴, Wanchun Xiang⁵, Ding-Jiang Xue^{1

2}, Yuan Lin^{1

2}, Anders Hagfeldt⁶

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
² University of Chinese Academy of Sciences, Beijing, 100049, China.
³ State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
⁴ College of Material Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China.
⁵ 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.
⁶ Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala, 75120, Sweden.

PMID: 35384201
DOI: 10.1002/anie.202204148

Abstract

Defect passivation via post-treatment of perovskite films is an effective method to fabricate high-performance perovskite solar cells (PSCs). However, the passivation durability is still an issue due to the weak and vulnerable bonding between passivating functional groups and perovskite defect sites. Here we propose a cholesterol derivative self-assembly strategy to construct crosslinked and compact membranes throughout perovskite films. These supramolecular membranes act as a robust protection layer against harsh operational conditions while providing effective passivation of defects from surface toward inner grain boundaries. The resultant PSCs exhibit a power conversion efficiency of 23.34 % with an impressive open-circuit voltage of 1.164 eV. The unencapsulated devices retain 92 % of their initial efficiencies after 1600 h of storage under ambient conditions, and remain almost unchanged after heating at 85 °C for 500 h in a nitrogen atmosphere, showing significantly improved stability.

Keywords: Durable Passivation; Intermolecular Interaction; Membrane; Perovskite Solar Cells; Self-Assembly.

Abstract

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