Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.
Sci Rep. 2017 May 15;7(1):1918. doi: 10.1038/s41598-017-02144-x.
Hybrid organic-inorganic halide CHNHPbI perovskite films are deposited on anodized aluminum oxide templates with the different pore diameters via one-step spin coating method. The obvious 0.082 eV blue shift of optical band gap is observed in films with decreasing the diameters of pores from 400 to 30 nm. And numerical simulations based on finite element modeling are carried out to represent the absorption edge and consistent with the experiment results. It is interesting that the films show the intense photoluminescence with the excitation intensity of less than 1 μW. Moreover, the photoluminescence intensity is increased with increasing pore diameters, which is attributed to the radiative recombination rate of photogenerated electrons and holes. These results pave a way for the further understanding of tunable photophysical properties of perovskite films.
基于有限元建模的数值模拟与实验结果一致，很好地解释了薄膜的吸收边。有趣的是，在激发光强小于 1 μW 的情况下，薄膜仍表现出很强的光致发光。此外，随着孔径的增大，光致发光强度增加，这归因于光生电子和空穴的辐射复合速率。这些结果为进一步理解钙钛矿薄膜可调谐的光物理性质铺平了道路。
