Light-induced beneficial ion accumulation for high-performance quasi-2D perovskite solar cells

Xiaomei Lian, Lijian Zuo, Bowen Chen, Biao Li, Haotian Wu, Shiqi Shan, Gang Wu, Xuegong Yu, Qi Chen, Liwei Chen, Deren Yang, David Cahen, Hongzheng Chen

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Ion migration and subsequent accumulation at interfaces, driven by the built-in potential (Vbi), are intrinsic properties of halide perovskite solar cells (PVSCs), which mostly decrease the device performance. To address this issue, we constructed favorable ion accumulation in perovskite solar cells via illumination to improve the performance of the quasi-2D PVSCs. This design dramatically improves the photo-carrier collection and enables significant device performance improvement from 14.6% to 19.05%, one of the best results for quasi-2D PVSCs. We argue that the light-triggered favorable ion accumulation originates from (1) the photo-induced quasi-Fermi level splitting that compensates the Vbi, so as to avoid the ion accumulation that decreases Vbi, and (2) the light-intensity-distribution-induced uneven ion potential further drives the segregation of mobile ions towards favorable ion accumulation, decreasing any I gradient between the anode and cathode. Our work provides insight into the fundamental understanding of ion accumulation in perovskite-based optoelectronic devices and paves the way to more stable, high-performance PVSCs.

Original languageEnglish
Pages (from-to)2499-2507
Number of pages9
JournalEnergy and Environmental Science
Volume15
Issue number6
DOIs
StatePublished - 29 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry

Funding

H. Chen and D. Cahen acknowledge support of a joint National Natural Science Foundation of China, NSFC − Israel Science Foundation, ISF, program, grants NSFC 51961145301 and ISF 3098/19. We further thank NSFC for support via grants (51620105006, 52173185, 62025403, 51973184 and 61721005, 22022205). We also acknowledge gratefully the “Pioneering” and “Leading Goose” R&D Program of Zhejiang (2022C01104), research start-up fund from Zhejiang University, Qizhen Research Fund from Zhejiang University (K20220132), technical support on SKPM measurements from Nano-X, SINANO and the National Key Research and Development Program of China (no. 2019YFA0705900).

FundersFunder number
National Natural Science Foundation of China
Israel Science Foundation2022C01104, ISF 3098/19, 51961145301, 22022205, 51973184, 61721005, 62025403, 52173185, 51620105006
Zhejiang UniversityK20220132
National Key Research and Development Program of China2019YFA0705900

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