A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells

Yuan L, Zhu W, Zhang Y, Li Y, Chan CCS, Qin M, Qiu J, Zhang K, Huang J, Wang J, Luo H, Zhang Z, Chen R, Liang W, Wei Q, Wong KS, Lu X, Li N, Brabec C, Ding L, Yan K (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Energy and Environmental Science Royal Society of Chemistry

Book Volume: 16

Pages Range: 1597-1609

Journal Issue: 4

DOI: 10.1039/d2ee03565k

Abstract

State-of-the-art n-i-p perovskite solar cells (PSCs) suffer from stability issues due to ionic interdiffusion. Herein, by enlarging the indacenodithiophene π-bridge donor (D′) to combine with the methoxy triphenylamine donor (D) and benzothiadiazole acceptor (A), three linear molecules termed L1, L2 and L3 with a D-A-D′-A-D structure are developed as dopant-free hole transport materials (HTMs). The π-bridge extension with active sites for coordination leverages the intramolecular dipole effect and intermolecular packing effect, resulting in a conformally bonded ultrathin interface with compact and uniform coverage (∼60 nm) to retard iodine migration and protect the buried perovskite. The unencapsulated L3-PSC (ITO/SnO2/perovskite/L3/MoO3/Au) achieved an impressive PCE of 22.61% (certified 21.79%, 0.0525 cm2). Ultrafast laser spectroscopy reveals that L-series molecules have a sequential reduction of photoexcited energy disorder to illustrate the structure-performance-stability relationship. L3-PSC maintains over 85% of the initial efficiency after 500 h at 85 °C maximum power point tracking (MPP) and enables the possibility of using small molecules to stabilize n-i-p PSCs.

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

South China University of Technology (SCUT) / 华南理工大学 CN China (CN) Hong Kong University of Science and Technology (HKUST) / 香港科技大學 CN China (CN) The Chinese University of Hong Kong (CUHK) CN China (CN) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) National Center for Nanoscience and Technology (NCNST) / 国家纳米科学中心 CN China (CN)

How to cite

APA:

Yuan, L., Zhu, W., Zhang, Y., Li, Y., Chan, C.C.S., Qin, M.,... Yan, K. (2023). A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells. Energy and Environmental Science, 16(4), 1597-1609. https://doi.org/10.1039/d2ee03565k

MLA:

Yuan, Ligang, et al. "A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells." Energy and Environmental Science 16.4 (2023): 1597-1609.

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