Inorganic Perovskite Solar Cells with High Voltage and Excellent Thermal and Environmental Stability
Inorganic Perovskite Solar Cells with High Voltage and Excellent Thermal and Environmental Stability
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DOI：
10.1021/acsaem.2c00624
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发表时间：
2022-04
影响因子：
6.4
通讯作者：
Junhao Zhu;Ranjith Kottokkaran;Saba Sharikadze;Harshavardhan A. Gaonkar;Laila-Parvin Poly;Arkadi Akopian;V. Dalal
中科院分区：
文献类型：
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作者：
Junhao Zhu;Ranjith Kottokkaran;Saba Sharikadze;Harshavardhan A. Gaonkar;Laila-Parvin Poly;Arkadi Akopian;V. Dalal
钙钛矿太阳能电池缺乏高温和大气稳定性一直是阻碍这种新兴光伏材料商业化的主要障碍之一。本工作提出了一种全无机CsPbBr 3钙钛矿太阳能电池，在热应力和环境应力下具有优异的稳定性。钙钛矿层是用良好控制的逐层气相沉积技术制造的，随后在两阶段工艺中退火。太阳能电池具有FTO/c-TiO 2/CsPbBr 3/缓冲层/P3 HT/Au的整体器件架构。在本征层和空穴传输层之间插入大带隙PbBr 2缓冲层。该层抑制电子在p-i界面处的复合，从而改善太阳能电池的性能。这些器件表现出的开路电压为1.64 V，是该钙钛矿材料有史以来报道的最高开路电压（Voc）。此外，该器件的光电转换效率为7.9%。当在高达300 °C的温度下退火24小时时，分离的钙钛矿层没有显示出降解。太阳能电池经受在20 °C下暴露于环境空气环境500小时而没有任何效率损失。即使暴露在空气中的高温（200 °C）也不会导致效率的变化。优异的环境耐受性和高Voc表明这种钙钛矿可用于具有Si的4端串联太阳能电池布置中。
The lack of high temperature and atmospheric stability of perovskite solar cells has been one of the primary obstacles hindering the commercialization of this emerging photovoltaic material. This work presents an all-inorganic CsPbBr3perovskite solar cell with excellent stability under both thermal and environmental stress. The perovskite layer was fabricated with a well-controlled layer-by-layer vapor deposition technique and subsequently annealed in a two-stage process. The solar cells have an overall device architecture of FTO/c-TiO2/CsPbBr3/buffer layer/P3HT/Au. A large band gap PbBr2buffer layer is inserted between the intrinsic layer and the hole transport layer. This layer inhibits the recombination of electrons at the p–i interface, improving the performance of the solar cell. The open-circuit voltage exhibited by these devices is 1.64 V, the highest open-circuit voltage (Voc) ever reported for this perovskite material. Additionally, the devices yielded a photo-conversion efficiency of 7.9%. The isolated perovskite layer showed no degradation when annealed at temperatures up to 300 °C for 24 h. The solar cells withstood exposure to an environment of ambient air at 20 °C for 500 h without any loss in efficiency. Even a high-temperature (200 °C) exposure in air did not result in changes in the efficiency. The excellent environmental tolerance and highVocindicate the potential for this perovskite to be used in a 4-terminal tandem solar cell arrangement with Si.