Electrical and Optical Tunability in All-Inorganic Halide Perovskite Alloy Nanowires

Teng Lei; Minliang Lai; Qiao Kong; Dylan Lu; Woochul Lee; Letian Dou; Vincent Wu; Yi Yu; Peidong Yang

doi:10.1021/acs.nanolett.8b00603

Electrical and Optical Tunability in All-Inorganic Halide Perovskite Alloy Nanowires

Nano Lett. 2018 Jun 13;18(6):3538-3542. doi: 10.1021/acs.nanolett.8b00603. Epub 2018 May 21.

Authors

Teng Lei¹, Minliang Lai¹, Qiao Kong¹, Dylan Lu¹, Woochul Lee², Letian Dou³, Vincent Wu⁴, Yi Yu⁵, Peidong Yang^{1

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Affiliations

¹ Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , United States.
² Department of Mechanical Engineering , University of Hawaii at Manoa , Honolulu , Hawaii 96822 , United States.
³ Davidson School of Chemical Engineering , Purdue University , West Lafayette , Indiana 47907 , United States.
⁴ Department of Chemical & Biomolecular Engineering , University of California, Berkeley , Berkeley , California 94720 , United States.
⁵ School of Physical Science and Technology , Shanghai Tech University , Shanghai 201210 , China.
⁶ Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
⁷ Department of Materials Science and Engineering , University of California, Berkeley , Berkeley , California 94720 , United States.
⁸ Kavli Energy NanoScience Institute , Berkeley , California 94720 , United States.

PMID: 29771532
DOI: 10.1021/acs.nanolett.8b00603

Abstract

Alloying different semiconductors is a powerful approach to tuning the optical and electronic properties of semiconductor materials. In halide perovskites (ABX₃), alloys with different anions have been widely studied, and great band gap tunability in the visible range has been achieved. However, perovskite alloys with different cations at the "B" site are less understood due to the synthetic challenges. Herein, we first have developed the synthesis of single-crystalline CsPb _xSn_{1- x}I₃ nanowires (NWs). The electronic band gaps of CsPb _xSn_{1- x}I₃ NWs can be tuned from 1.3 to 1.78 eV by varying the Pb/Sn ratio, which leads to the tunable photoluminescence (PL) in the near-infrared range. More importantly, we found that the electrical conductivity increases as more Sn²⁺ is alloyed with Pb²⁺, possibly due to the increase of charge carrier concentration when more Sn²⁺ is introduced. The wide tunability of the optical and electronic properties makes CsPb _xSn_{1- x}I₃ alloy NWs promising candidates for future optoelectronic device applications.

Keywords: Semiconductor alloy; halide perovskite; nanowires; tunability.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.