Zhang Jing, Han Shiguo, Ji Chengmin, Zhang Weichuan, Wang Yuyin, Tao Kewen, Sun Zhihua, Luo Junhua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian, 350002, P.R. China.
Fuzhou university, No. 2 College Road, University New District, Fuzhou, Fujian, 350108, P.R. China.
Chemistry. 2017 Dec 6;23(68):17304-17310. doi: 10.1002/chem.201703346. Epub 2017 Nov 14.
Perovskite hybrids of lead organometal halides, most notably CH NH PbI , have shown extremely promising applications in the field of optoelectronics, because of their remarkable semiconducting and light-absorbing properties. However, two key issues-the toxicity of lead and the poor ambient instabilities-have restrained their further commercialization. Herein, we have designed a new stable polar lead-free hybrid material by utilizing the strategy of cation substitution, [(CH ) N] Bi I (1), which adopts the 0D inorganic perovskite-like architecture by face-sharing BiI octahedra. It is interesting that 1 displays excellent absorbing properties with a narrow optical band gap of ≈2.0 eV, and positive temperature-dependent conductivity confirms its semiconducting behaviors. In addition, 1 has good phase stability against decomposition under ambient conditions, much superior to that of CH NH PbI . This work suggests the potential of 1 as a lead-free semiconducting absorber with high phase stability for photoelectric applications.
有机金属卤化铅钙钛矿杂化物，最典型的是CH₃NH₃PbI₃，因其卓越的半导体和光吸收特性，在光电子领域展现出极具潜力的应用前景。然而，两个关键问题——铅的毒性和较差的环境稳定性——限制了它们的进一步商业化。在此，我们通过阳离子取代策略设计了一种新型稳定的极性无铅杂化材料[(CH₃)₄N]₃Bi₂I₉(1)，它通过共面的BiI₆八面体采用零维无机类钙钛矿结构。有趣的是，1表现出优异的吸收性能，光学带隙约为2.0 eV且较窄，正的温度依赖性电导率证实了其半导体行为。此外，1在环境条件下具有良好的抗分解相稳定性，远优于CH₃NH₃PbI₃。这项工作表明1作为一种具有高相稳定性的无铅半导体吸收剂在光电应用方面的潜力。
