Buried hole-selective interface engineering for high-efficiency tin-lead perovskite solar cells with enhanced interfacial chemical stability

Zhang, Xu, Pascual, Jorge, Li, Zhihao, Zhang, Xilin, Su, Zhenhuang, Zhang, Junhan, Gao, Xingyu, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Li, Guixiang, Abate, Antonio and Li, Meng 2025. Buried hole-selective interface engineering for high-efficiency tin-lead perovskite solar cells with enhanced interfacial chemical stability. Science Bulletin 70 (4) , pp. 556-562. 10.1016/j.scib.2024.12.004 Item availability restricted.

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Abstract

Mixed Sn-Pb perovskites are attracting significant attention due to their narrow bandgap and consequent potential for all-perovskite tandem solar cells. However, the conventional hole transport materials can lead to band misalignment or induce degradation at the buried interface of perovskite. Here we designed a self-assembled material 4-(9H-carbozol-9-yl)phenylboronic acid (4PBA) for the surface modification of the substrate as the hole-selective contact. It incorporates an electron-rich carbazole group and conjugated phenyl group, which contribute to a substantial interfacial dipole moment and tune the substrate’s energy levels for better alignment with the Sn-Pb perovskite energy levels, thereby promoting hole extraction. Meanwhile, enhanced perovskite crystallization and improved contact at bottom of the perovskite minimized defects within perovskite bulk and at the buried interface, suppressing non-radiative recombination. Consequently, Sn-Pb perovskite solar cells using 4PBA achieved efficiencies of up to 23.45%. Remarkably, 4PBA layer provided superior interfacial chemical stability, and effectively mitigated device degradation. Unencapsulated devices retained 93.5% of their initial efficiency after 2000 h of shelf storage.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	Elsevier
ISSN:	2095-9273
Date of First Compliant Deposit:	11 December 2024
Date of Acceptance:	18 November 2024
Last Modified:	04 Mar 2025 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/174682

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