High-Performance, Air-Stable, Low-Temperature Processed Semitransparent Perovskite Solar Cells Enabled by Atomic Layer Deposition

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• 作者：Chih-Yu Chang ; Kuan-Ting Lee ; Wen-Kuan Huang ; Hao-Yi Siao ; Yu-Chia Chang
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：27
• 期：14
• 页码：5122-5130
• 全文大小：451K
• ISSN：1520-5002

文摘

We demonstrate high-performance, air-stable, low-temperature processed (鈮?00 掳C) semitransparent (ST) perovskite solar cells (PSCs) by the applications of atomic layer deposition (ALD) technology to deposit ZnO and Al₂O₃ films as cathode buffer layer (CBL) and encapsulation layer, respectively. The application of ALD ZnO film as CBL in PSCs delivers several remarkable features, including fine-tunability of the work function of the electrode, low deposition temperature (80 掳C), high charge selectivity, good electron-transporting ability (filed-effect mobility = 16.1 cm² V^鈥? s^鈥?), and excellent film coverage. With these desired interfacial properties, the device with opaque Ag electrode delivers high power conversion efficiency (PCE) up to 16.5%, greatly outperforming the device with state-of-the-art CBL ZnO nanoparticles film (10.8%). For ST PSCs employing Ag nanowires as transparent top electrode, a remarkable PCE of 10.8% with a corresponding average visible transmittance (AVT) of 25.5% is demonstrated, which represents the highest PCE ever reported for ST PSCs with similar AVT. More significantly, the insufficient ambient stability of ST device is significantly improved by employing excellent gas-barrier performance of ALD Al₂O₃-based encapsulation layer with an oxygen transmission rate of 1.9 脳 10^鈥? cm³ m^鈥? day^鈥? and a water vapor transmittance rate of 9.0 脳 10^鈥? g m^鈥? day^鈥?.