Huang Po-Jung, Taniguchi Kouji, Miyasaka Hitoshi
Department of Chemistry, Graduate School of Science , Tohoku University , 6-3 Aramaki-Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan.
Institute for Materials Research, Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan.
J Am Chem Soc. 2019 Sep 18;141(37):14520-14523. doi: 10.1021/jacs.9b06815. Epub 2019 Sep 6.
The bulk photovoltaic effect (BPVE) is a promising optoelectronic phenomenon for generating a steady-state photocurrent without a bias voltage. Nevertheless, the simple and rational design of materials exhibiting the BPVE remains an important topic in the relevant fields. Here, we report the observation of the BPVE in a simple chiral-polar pair of layered perovskite-type lead iodides in the crystal space group of 1 (#1), which were synthesized by assembling and -chiral organic cations, respectively. The sign of the zero-bias photocurrent is altered by the /-chirality of the assembled cations, which define the direction of electric polarization derived from the electric dipole moment of each chiral organic cation aligned in a crystal. The strategy of chirality control in a crystal is expected to be useful when searching for BPVE materials.
体光伏效应（BPVE）是一种很有前景的光电现象，可在无偏压的情况下产生稳态光电流。然而，具有BPVE的材料的简单合理设计仍然是相关领域的一个重要课题。在此，我们报告了在晶体空间群为1（#1）的一对简单手性-极性层状钙钛矿型碘化铅中观察到BPVE，它们分别通过组装和-手性有机阳离子合成。零偏压光电流的符号因组装阳离子的/-手性而改变，这种手性定义了由晶体中排列的每个手性有机阳离子的电偶极矩产生的极化方向。晶体中的手性控制策略在寻找BPVE材料时有望发挥作用。
