Critical Role of Interface and Crystallinity on the Performance and Photostability of Perovskite Solar Cell on Nickel Oxide
Critical Role of Interface and Crystallinity on the Performance and Photostability of Perovskite Solar Cell on Nickel Oxide
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DOI：
10.1002/adma.201703879
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发表时间：
2018-02-01
影响因子：
29.4
通讯作者：
Mohite, Aditya D.
中科院分区：
文献类型：
--
作者：
Nie, Wanyi;Tsai, Hsinhan;Mohite, Aditya D.
混合钙钛矿正朝着实现最有效的单结、溶液处理光伏器件的方向发展。然而，一个关键的问题是有限的理解之间的相关性的结晶度和新兴的钙钛矿/空穴（或电子）传输层的器件性能和光稳定性。在这里，示出了混合钙钛矿在氧化镍（NiO）上的受控生长，导致形成具有增强的结晶度的薄膜，该薄膜具有特征峰宽和分裂，让人想起单晶中的四方晶相。光物理和界面敏感的测量揭示了减少陷阱密度的钙钛矿/NiO界面上生长的聚（3，4-乙撑二氧噻吩）聚苯乙烯磺酸钙钛矿相比。光伏电池表现出高的开路电压（1.12 V），表明一个接近理想的能带排列。此外，观察到高达10个太阳的光伏器件的光稳定性，这是NiO上的钙钛矿薄膜的上级结晶度的直接结果。这些结果阐明了钙钛矿/空穴传输层界面的质量在呈现高性能和光稳定的光电器件中的关键作用。
Hybrid perovskites are on a trajectory toward realizing the most efficient single-junction, solution-processed photovoltaic devices. However, a critical issue is the limited understanding of the correlation between the degree of crystallinity and the emergent perovskite/hole (or electron) transport layer on device performance and photostability. Here, the controlled growth of hybrid perovskites on nickel oxide (NiO) is shown, resulting in the formation of thin films with enhanced crystallinity with characteristic peak width and splitting reminiscent of the tetragonal phase in single crystals. Photophysical and interface sensitive measurements reveal a reduced trap density at the perovskite/NiO interface in comparison with perovskites grown on poly(3,4-ethylene dioxy thiophene) polystyrene sulfonate. Photovoltaic cells exhibit a high open circuit voltage (1.12 V), indicating a near-ideal energy band alignment. Moreover, photostability of photovoltaic devices up to 10-Suns is observed, which is a direct result of the superior crystallinity of perovskite thin films on NiO. These results elucidate the critical role of the quality of the perovskite/hole transport layer interface in rendering high-performance and photostable optoelectronic devices.