journal article·2024-02-09

“T-shaped” Carbazole Alkylammonium Cation Passivation in Perovskite Solar Cells

Zhuojie Shi, Renjun Guo, Ran Luo, Xi Wang, Jianpeng Ma, Jiangang Feng, Xiuxiu Niu, Ezra Alvianto, Zhenrong Jia, Xiao Guo, Haoming Liang, Jinxi Chen, Zerui Li, Kun Sun, Xiongzhuo Jiang, Yuchen Wu, Peter Müller-Buschbaum, Wenping Hu, Yi Hou

ACS Energy Letters· Volume 9· Issue 2
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Abstract

Incorporating alkylammonium cations atop the 3D perovskite enables effective defect passivation and significantly enhances the power conversion efficiency of perovskite solar cells. However, the diversity and durability of this passivation strategy have been limited to the ligand type and diffusion of ligands due to high reactivity. Here, we designed bulky “T-shaped” conjugated carbazole alkylammonium cations with inner π–π interaction and enlarged steric hindrance to minimize ligand diffusion while maintaining passivation effects. As verified by grazing incidence X-ray diffraction and transient absorption spectra, these “T-shaped” passivators could keep a stable intrinsic crystal phase on the perovskite surface after thermal aging. Additionally, the devices utilizing these organic semiconductor-based “T-shaped” ligands were relatively constant in series resistance and introduced higher hole mobility than the PEAI. Finally, the champion device using the “T-shaped” passivator achieved a maximum device efficiency of 25.1% with improved operational stability under 1 sun illumination.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Organic Light-Emitting Diodes Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore

Solar Energy Research Institute of Singapore (SERIS), National University of Singapore, Singapore 117574, Singapore

Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Fuzhou, Fuzhou 350207, China

Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, Munich 80333, Germany

Heinz Maier-Leibnitz-Zentrum, Technical University of Munich, Munich 80333, Germany

Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China

Funding

Ministry of Education - Singapore · Deutsche Forschungsgemeinschaft · China Scholarship Council · National University of Singapore

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