Que Chen-Jie, Mo Chong-Jiao, Li Zhao-Qi, Zhang Guang-Lin, Zhu Qin-Yu, Dai Jie
College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, P. R. China.
Inorg Chem. 2017 Mar 6;56(5):2467-2472. doi: 10.1021/acs.inorgchem.6b02550. Epub 2017 Feb 20.
A great effort has been made to investigate 2D perovskites to improve the stability and controllability in the fabrication of photoelectronic devices. As far as we know, only small organic cations such as methylammonium can incorporate into the multilayered perovskite structure except the cations sandwiched between the inorganic layers. We report here a new layered lead iodide, (HAepz)PbI (1), where larger organic cations, bis-protonated 2-(2-aminoethyl)pyrazole (Aepz), not only were sandwiched between the inorganic layers but also were incorporated within the perovskite-like PbI layered structure. Another 2D compound, (HAepz)PbI (2), was also prepared that was a one-layer perovskite. A simple Schottky device was prepared to investigate the photoelectroresponsive properties of the compounds in comparison with that of a typical organic-inorganic hybrid perovskite. In general, the energy gap is decreased with an increase in the perovskite layers, but the band gap of two-layered 1 is larger than that of one-layered 2. The photocurrent densities of the compounds are in the order of 1 < 2 < (CHNH)PbI, which is discussed based on the crystal structures and band energy gaps.
人们已经付出了巨大努力来研究二维钙钛矿，以提高光电器件制造中的稳定性和可控性。据我们所知，除了夹在无机层之间的阳离子外，只有甲基铵等小有机阳离子能够掺入多层钙钛矿结构中。我们在此报告一种新的层状碘化铅，(HAepz)PbI (1)，其中较大的有机阳离子双质子化的2-(2-氨基乙基)吡唑(Aepz)不仅夹在无机层之间，而且掺入了类钙钛矿PbI层状结构中。还制备了另一种二维化合物(HAepz)PbI (2)，它是一种单层钙钛矿。制备了一个简单的肖特基器件，以研究这些化合物与典型有机-无机杂化钙钛矿相比的光电响应特性。一般来说，随着钙钛矿层数的增加，能隙会减小，但双层1的带隙大于单层2的带隙。化合物的光电流密度顺序为1 < 2 < (CHNH)PbI，这将根据晶体结构和带隙能量进行讨论。
