Regulating crystallization dynamics and crystal orientation of methylammonium tin iodide enables high-efficiency lead-free perovskite solar cells

Long Ji, Ting Zhang, Yafei Wang, Detao Liu, Hao Chen, Hualin Zheng, Xuefeng Peng, Shihao Yuan, Zhi David Chen, Shibin Li

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Tin (Sn)-based perovskite solar cells (PSCs) have attracted much attention because they are more environmentally friendly than lead-based PSCs. However, the fast crystallization of Sn-based perovskite films and the easy oxidation of Sn2+ to Sn4+ hinder the improvement of their efficiency and stability. In this work, ethylammonium bromide (EABr) was added to methylammonium tin iodide (MASnI3) perovskite precursor solution to regulate the crystallization dynamics and improve the film morphology. The results show that the large EA+ ions slow down the crystallization process of Sn-based perovskites and form a smooth perovskite film with high crystallinity, while the added Br- anions further improved the crystallinity and orientation of the perovskite film. Under the combined action of EA+ and Br- ions, the as-produced PSCs achieved a champion power conversion efficiency (PCE) of 9.59%. The EABr additive also retarded the oxidation of Sn2+, and the solar cell device maintained 93% of its initial efficiency after 30 days in a nitrogen-filled glove box without being encapsulated. This work provides a new strategy for the realization of high-efficiency Sn-based PSCs.

Original languageEnglish
Pages (from-to)1219-1225
Number of pages7
JournalNanoscale
Volume14
Issue number4
DOIs
StatePublished - Jan 28 2022

Bibliographical note

Funding Information:
This work was supported by National Natural Science Foundation of China (62174021, 62104028, and 61874150), Sichuan Science and Technology Program (2020YJ0244) and China Postdoctoral Science Foundation (2021M700689). This work was partially supported by University of Kentucky. The authors also thank surface X-ray diffraction beamline at the SSRF for providing the beam time.

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Materials Science (all)

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