Improve Hole Collection by Interfacial Chemical Redox Reaction at a Mesoscopic NiO/CH3NH3PbI3 Heterojunction for Efficient Photovoltaic Cells
Improve Hole Collection by Interfacial Chemical Redox Reaction at a Mesoscopic NiO/CH3NH3PbI3 Heterojunction for Efficient Photovoltaic Cells
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DOI：
10.1002/admi.201600135
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发表时间：
2016-09
影响因子：
5.4
通讯作者：
Ming-Wei Lin;Kuo-Chin Wang;Jenghan Wang;Ming-Hsien Li;Yu-Ling Lai;T. Ohigashi;N. Kosugi;Peter Chen;D. Wei;Tzung‐Fang Guo;Y. Hsu
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文献类型：
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作者：
Ming-Wei Lin;Kuo-Chin Wang;Jenghan Wang;Ming-Hsien Li;Yu-Ling Lai;T. Ohigashi;N. Kosugi;Peter Chen;D. Wei;Tzung‐Fang Guo;Y. Hsu
当有机金属-三卤化物-钙钛矿太阳能电池结合到介观氧化镍（NiOnc）空穴传输层中时，表现出很高的效率。 NiOnc-钙钛矿异质结的集成提供了一种无机替代品，作为 p 型接触材料，可有效提取钙钛矿太阳能电池的空穴。本文利用X射线光电子能谱、紫外光电子能谱、近边X射线吸收精细结构谱、扫描透射X射线显微镜和电子结构计算，从NiOnc-钙钛矿异质结的电子、化学和传输特性方面研究了这种高效载流子传输的起源。在 NiOnc-钙钛矿异质结处发现了明显的化学氧化还原反应，使得 PbI2 被氧化为 PbO，随后在异质结处形成空穴掺杂剂 CH3NH3PbI3–2δOδ。 NiOnc/钙钛矿异质结处氧化还原反应诱导产生空穴掺杂CH3NH3PbI3-2δOδ，对于促进载流子传输具有重要作用，从而提高光伏效率。
Organometal‐trihalide‐perovskite‐based solar cells have exhibited high efficiencies when incorporated into mesoscopic NiO (NiOnc) hole‐transport layers. The integration of a NiOnc‐perovskite heterojunction provides an inorganic alternative as a p‐type contact material with efficient hole extraction for perovskite‐based solar cells. Herein the origin of such highly efficient carrier transport is studied in terms of electronic, chemical and transport properties of a NiOnc‐perovskite heterojunction with X‐ray photoelectron spectra, ultraviolet photoelectron spectra, near‐edge X‐ray absorption fine structure spectra, a scanning transmission X‐ray microscope, and calculations of electronic structure. A pronounced chemical redox reaction is found at an NiOnc‐perovskite heterojunction such that PbI2 is oxidized to PbO with subsequent formation of hole‐dopant CH3NH3PbI3–2δOδ at the heterojunction. The generation of hole‐doping CH3NH3PbI3–2δOδ induced by the redox reaction at the NiOnc/perovskite heterojunction plays a significant role to facilitate the carrier transport, and thus enhances the photovoltaic efficiencies.