Tailoring of Electron-Collecting Oxide Nanoparticulate Layer for Flexible Perovskite Solar Cells

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• 作者：Seong Sik Shin ; Woon Seok Yang ; Eun Joo Yeom ; Seon Joo Lee ; Nam Joong Jeon ; Young-Chang Joo ; Ik Jae Park ; Jun Hong Noh ; Sang Il Seok
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：May 19, 2016
• 年：2016
• 卷：7
• 期：10
• 页码：1845-1851
• 全文大小：411K
• 年卷期：0
• ISSN：1948-7185

文摘

Low-temperature-processed perovskite solar cells (PSCs), especially those fabricated on flexible substrates, exhibit device performance that is worse than that of high-temperature-processed PSCs. One of the main reasons for the inferior performance of low-temperature-processed PSCs is the loss of photogenerated electrons in the electron collection layer (ECL) or related interfaces, i.e., indium tin oxide/ECL and ECL/perovskite. Here, we report that tailoring of the energy level and electron transporting ability in oxide ECLs using Zn₂SnO₄ nanoparticles and quantum dots notably minimizes the loss of photogenerated electrons in the low-temperature-fabricated flexible PSC. The proposed ECL with methylammonium lead halide [MAPb(I_0.9Br_0.1)₃] leads to fabrication of significantly improved flexible PSCs with steady-state power conversion efficiency of 16.0% under AM 1.5G illumination of 100 mW cm^–2 intensity. These results provide an effective method for fabricating high-performance, low-temperature solution-processed flexible PSCs.