Chirality‐Dependent Circular Photogalvanic Effect in Enantiomorphic 2D Organic–Inorganic Hybrid Perovskites,Advanced Materials

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Chirality‐Dependent Circular Photogalvanic Effect in Enantiomorphic 2D Organic–Inorganic Hybrid Perovskites
Advanced Materials ( IF 27.4 ) Pub Date : 2021-03-23 , DOI: 10.1002/adma.202008611
Po‐Jung Huang ₁ , Kouji Taniguchi _{1,

2,

3} , Masato Shigefuji ₄ , Takatsugu Kobayashi ₄ , Masakazu Matsubara _{4,

5} , Takao Sasagawa ₆ , Hiroyasu Sato ₇ , Hitoshi Miyasaka _{1,

2}

Affiliation

The control of the optoelectronic properties of 2D organic–inorganic hybrid perovskite (2D‐OIHP) lead halides is an increasingly prevalent topic. Herein, the observation of the circular photogalvanic effect (CPGE) in new enantiomorphic 2D‐OIHP lead iodides is reported, which are synthesized as a first OIHP‐related system belonging to a chiral space group by incorporating organic chiral cations into the inorganic layers of lead iodides. The CPGE is an optoelectronic phenomenon associated with the spin–orbit coupling of heavy atoms in noncentrosymmetric systems. Owing to the CPGE, light‐helicity‐dependent steady photocurrents are generated without an external bias voltage under the irradiation of circularly polarized light. Furthermore, the sign reversal of the CPGE photocurrent depending on the chirality of the designed 2D‐OIHP lead iodides is observed. This result indicates formation of the theoretically predicted radial spin‐polarized texture in k‐space of chiral systems owing to spin‐momentum locking. Hence, chiral 2D‐OIHP lead halides can be a promising platform for engineering opto‐spintronic functionalities.

中文翻译：

对映体二维有机-无机杂化钙钛矿中的手性依赖型圆形光电效应。

二维有机-无机杂化钙钛矿（2D-OIHP）卤化铅的光电性能控制已成为越来越普遍的话题。本文报道了新的对映体2D-OIHP碘化铅中的圆形光电动效应（CPGE）的观察结果，该化合物通过将有机手性阳离子掺入铅的无机层中而合成为第一个属于手性空间群的OIHP相关系统碘化物。CPGE是一种光电子现象，与非中心对称系统中重原子的自旋轨道耦合有关。由于CPGE，在圆偏振光的照射下，在没有外部偏置电压的情况下，可以产生依赖于光螺旋性的稳定光电流。此外，观察到CPGE光电流的符号反转取决于所设计的2D-OIHP碘化铅的手性。该结果表明在理论上预测了径向自旋极化织构的形成。由于自旋动量锁定，手性系统的k空间。因此，手性2D-OIHP卤化铅可以成为工程光电自旋电子功能的有前途的平台。

更新日期：2021-04-27

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