Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy: Variation with Photon Energy
Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy: Variation with Photon Energy
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DOI：
10.1021/acs.jpcc.7b08948
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发表时间：
2017-12-07
影响因子：
3.7
通讯作者：
Rensmo, Hakan
中科院分区：
文献类型：
--
作者：
Philippe, Bertrand;Jacobsson, T. Jesper;Rensmo, Hakan
更好地了解用于光伏器件的钙钛矿材料的电子结构对于开发和优化它们是至关重要的。本文利用同步加速器光电子能谱(PES)实验研究了混合钙钛矿结构的价带结构特征和能带位置。用光电子能谱(21.2 eV)和硬X射线(4000 EV)测量了价带，并考虑了光致电离截面的变化，从实验上确定了无机和有机的贡献。将实验与理论计算进行了比较，以进一步区分不同阴离子在电子结构中的作用。这项工作还包括深入研究价带最大值及其与费米能级的关系，这对于完整的太阳能电池及其功能特性的设计和优化至关重要。
A better understanding of the electronic structure of perovskite materials used in photovoltaic devices is essential for their development and optimization. In this investigation, synchrotron-based photoelectron spectroscopy (PES) was used to experimentally delineate the character and energy position of the valence band structures of a mixed perovskite. The valence band was measured using PES with photon energies ranging from ultraviolet photoelectron spectroscopy (21.2 eV) to hard X-rays (up to 4000 eV), and by taking the variation of the photoionization cross sections into account, we could experimentally determine the inorganic and organic contributions. The experiments were compared to theoretical calculations to further distinguish the role of the different anions in the electronic structure. This work also includes a thorough study of the valence band maximum and its position in relation to the Fermi level, which is crucial for the design and optimization of complete solar cells and their functional properties.