Nam Jiyoon, Kim Jae Ho, Kim Chang Su, Kwon Jung-Dae, Jo Sungjin
School of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu 41566, Korea.
Surface Technology Division, Korea Institute of Materials Science, 797 Changwondaero, Sungsan-Gu, Changwon, Gyeongnam 51508, Korea.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):12648-12655. doi: 10.1021/acsami.9b18660. Epub 2020 Mar 3.
A major problem in the application of mesoporous TiO as an electron transport layer for flexible perovskite solar cells is that a high-temperature sintering process is required to remove organic additives from the TiO layer. A facile oxygen plasma process is herein demonstrated to fabricate mesoporous-structured perovskite solar cells with significant photovoltaic performance at low temperatures. When the low-temperature processed TiO layer is modified via oxygen plasma, the organic additives in the TiO layer that hinder the charge transport process are successfully decomposed. The oxygen plasma treatment improves the wettability and infiltration of the perovskite layer and also passivates the oxygen vacancy related traps in TiO. Hence, the oxygen plasma treatment evidently enhances charge extraction and transport, thereby improving photovoltaic performance and decreasing hysteresis.
将介孔TiO用作柔性钙钛矿太阳能电池的电子传输层时，一个主要问题是需要高温烧结工艺来去除TiO层中的有机添加剂。本文展示了一种简便的氧等离子体工艺，可在低温下制备具有显著光伏性能的介孔结构钙钛矿太阳能电池。当通过氧等离子体对低温处理的TiO层进行改性时，TiO层中阻碍电荷传输过程的有机添加剂被成功分解。氧等离子体处理改善了钙钛矿层的润湿性和浸润性，还钝化了TiO中与氧空位相关的陷阱。因此，氧等离子体处理显著增强了电荷提取和传输，从而提高了光伏性能并降低了滞后现象。
