PT  - JOURNAL ARTICLE
AU  - Hu, Yang
AU  - Florio, Fred
AU  - Chen, Zhizhong
AU  - Phelan, W. Adam
AU  - Siegler, Maxime A.
AU  - Zhou, Zhe
AU  - Guo, Yuwei
AU  - Hawks, Ryan
AU  - Jiang, Jie
AU  - Feng, Jing
AU  - Zhang, Lifu
AU  - Wang, Baiwei
AU  - Wang, Yiping
AU  - Gall, Daniel
AU  - Palermo, Edmund F.
AU  - Lu, Zonghuan
AU  - Sun, Xin
AU  - Lu, Toh-Ming
AU  - Zhou, Hua
AU  - Ren, Yang
AU  - Wertz, Esther
AU  - Sundararaman, Ravishankar
AU  - Shi, Jian
TI  - A chiral switchable photovoltaic ferroelectric 1D perovskite
AID  - 10.1126/sciadv.aay4213
DP  - 2020 Feb 01
TA  - Science Advances
PG  - eaay4213
VI  - 6
IP  - 9
4099  - http://advances.sciencemag.org/content/6/9/eaay4213.short
4100  - http://advances.sciencemag.org/content/6/9/eaay4213.full
SO  - Sci Adv2020 Feb 01; 6
AB  - Spin and valley degrees of freedom in materials without inversion symmetry promise previously unknown device functionalities, such as spin-valleytronics. Control of material symmetry with electric fields (ferroelectricity), while breaking additional symmetries, including mirror symmetry, could yield phenomena where chirality, spin, valley, and crystal potential are strongly coupled. Here we report the synthesis of a halide perovskite semiconductor that is simultaneously photoferroelectricity switchable and chiral. Spectroscopic and structural analysis, and first-principles calculations, determine the material to be a previously unknown low-dimensional hybrid perovskite (R)-(−)-1-cyclohexylethylammonium/(S)-(+)-1 cyclohexylethylammonium) PbI3. Optical and electrical measurements characterize its semiconducting, ferroelectric, switchable pyroelectricity and switchable photoferroelectric properties. Temperature dependent structural, dielectric and transport measurements reveal a ferroelectric-paraelectric phase transition. Circular dichroism spectroscopy confirms its chirality. The development of a material with such a combination of these properties will facilitate the exploration of phenomena such as electric field and chiral enantiomer–dependent Rashba-Dresselhaus splitting and circular photogalvanic effects.