Controlling the Phase Transition in CsPbI3 Nanowires

Lin, Chung-Kuan; Zhang, Ye; Gao, Mengyu; Lin, Jia-An; Le, Han K. D.; Lin, Zhenni; Yang, Peidong

doi:10.1021/acs.nanolett.2c00170

Controlling the Phase Transition in CsPbI₃ Nanowires

Journal Article · Sun Mar 06 23:00:00 EST 2022 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.2c00170· OSTI ID:1896685

^[1]; ^[1]; ^[2]; Lin, Jia-An ^[3]; ^[1]; Lin, Zhenni ^[2]; ^[4]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)

Cesium lead iodide (CsPbI₃) is a promising semiconductor with a suitable band gap for optoelectronic devices. CsPbI₃ has a metastable perovskite phase that undergoes a phase transition into an unfavorable nonperovskite phase in an ambient environment. This phase transition changes the optoelectronic properties of CsPbI₃ and hinders its potential for device applications. Therefore, it is of central importance to understand the kinetics of such instability and develop strategies to control and stabilize the perovskite phase. Here, we use ultralong CsPbI₃ nanowires as a model platform to investigate the phase transition kinetics. Our results depict the role of environmental stressors (moisture and temperature) in controlling the phase transition dynamics of CsPbI₃, which can serve as guiding principles for future phase transition studies and the design of related photovoltaics. Furthermore, we demonstrate the controllability of phase propagation on individual nanowires by varying the moisture level and temperature.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Institutes of Health (NIH); Ministry of Education; Suzhou Industrial Park

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1896685

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 6 Vol. 22; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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