Thermally Assisted Rashba Splitting and Circular Photogalvanic Effect in Aqueously Synthesized 2D Dion–Jacobson Perovskite Crystals

Recently, a two-dimensional Dion–Jacobson (DJ) perovskite (AMP)­PbI4 (AMP = 4-(aminomethyl)­piperidinium) is emerging with remarkable Rashba effect and ferroelectricity. However, the origin of the giant Rashba splitting remains elusive and the current synthetic strategy via slow cooling is time- and...

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Published in:Nano letters 2021-06, Vol.21 (11), p.4584-4591
Main Authors: Zhou, Boxuan, Liang, Lihan, Ma, Jiaqi, Li, Junze, Li, Wancai, Liu, Zeyi, Li, Haolin, Chen, Rui, Li, Dehui
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container_end_page 4591
container_issue 11
container_start_page 4584
container_title Nano letters
container_volume 21
creator Zhou, Boxuan
Liang, Lihan
Ma, Jiaqi
Li, Junze
Li, Wancai
Liu, Zeyi
Li, Haolin
Chen, Rui
Li, Dehui
description Recently, a two-dimensional Dion–Jacobson (DJ) perovskite (AMP)­PbI4 (AMP = 4-(aminomethyl)­piperidinium) is emerging with remarkable Rashba effect and ferroelectricity. However, the origin of the giant Rashba splitting remains elusive and the current synthetic strategy via slow cooling is time- and power-consuming, hindering its future applications. Here, we report on an economical aqueous method to obtain (AMP)­PbI4 crystals and clarify the origin of the giant Rashba effect by temperature- and polarization-dependent photoluminescence (PL) spectroscopy. The strong temperature-dependent PL helicity indicates the thermally assisted structural distortion as the main origin of the Rashba effect, suggesting that valley polarization still preserves at high temperatures. The Rashba effect was further confirmed by the circular photogalvanic effect near the indirect bandgap. Our study not only optimizes the synthetic strategies of this DJ perovskite but also sheds light on its potential applications in room/high-temperature spintronics and valleytronics.
doi_str_mv 10.1021/acs.nanolett.1c00364
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title Thermally Assisted Rashba Splitting and Circular Photogalvanic Effect in Aqueously Synthesized 2D Dion–Jacobson Perovskite Crystals
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