Narrow band gap and high mobility of lead-free perovskite single crystal Sn-doped MA3Sb2I9

Dianxing JU, Xiaomei JIANG, Hang XIAO*, Xi CHEN, Xiaobo HU, Xutang TAO*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

68 Citations (Scopus)

Abstract

Sb-based perovskite structures have been studied as the potential materials to replace lead hybrid perovskite. However, their broad band gap makes them unsuitable for single-junction solar cells, which spurred researchers to design new strategies to narrow the band gap and broaden their photovoltaic application. Herein, a general doping strategy was designed to obtain lead-free and large size Sn-doped MA3Sb2I9 single crystals. Their crystal structures and valence states were investigated in detail by X-ray diffraction and the X-ray photoelectron spectroscopy, revealing distinct lattice expansion, thus demonstrating the successful doping of Sn2+. After the doping of Sn2+, a significant 296 nm red-shifted light absorption peak was clearly observed, and the carrier mobility enhanced by about two-fold, as investigated by space charge-limited current (SCLC) and Hall effect measurements. The trend of the band gap determined by the first-principles calculations matches well with that of experiments. The corresponding narrowing mechanism of band gap after the doping is also revealed in detail. These extremely promising photoelectric properties of Sn-doped MA3Sb2I9 shown herein motivate further exploration of their photovoltaic application. © The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)20753-20759
Number of pages7
JournalJournal of Materials Chemistry A
Volume6
Issue number42
Early online date2 Oct 2018
DOIs
Publication statusPublished - 14 Nov 2018
Externally publishedYes

Bibliographical note

This study was supported by the National Natural Science Foundation of China (grant nos. 51321091, 51272129, 51227002), National key Research and Development Program of China (Grant No. 2016YFB1102201) and the Program of Introducing Talents of Disciplines to Universities in China (111 Project 2.0 (Grant No: BP2018013)).

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