Chen T.-P.Lin C.-W.Li S.-S.Tsai Y.-H.Wen C.-Y.Lin W.J.Hsiao F.-M.Chiu Y.-P.Tsukagoshi K.Osada M.Sasaki T.CHUN-WEI CHENYA-PING CHIU et al.CHENG-YEN WENCHUNG-WEI LIN et al.2019-11-272019-11-27201816146832https://www.scopus.com/inward/record.uri?eid=2-s2.0-85029354402&doi=10.1002%2faenm.201701722&partnerID=40&md5=603ab91c320dccf81278b6f613b07e3bhttps://scholars.lib.ntu.edu.tw/handle/123456789/432782A novel atomic stacking transporting layer (ASTL) based on 2D atomic sheets of titania (Ti1−δO2) is demonstrated in organic–inorganic lead halide perovskite solar cells. The atomically thin ASTL of 2D titania, which is fabricated using a solution-processed self-assembly atomic layer-by-layer deposition technique, exhibits the unique features of high UV transparency and negligible (or very low) oxygen vacancies, making it a promising electron transporting material in the development of stable and high-performance perovskite solar cells. In particular, the solution-processable atomically thin ASTL of 2D titania atomic sheets shows superior inhibition of UV degradation of perovskite solar cell devices, compared to the conventional high-temperature sintered TiO2 counterpart, which usually causes the notorious instability of devices under UV irradiation. The discovery opens up a new dimension to utilize the 2D layered materials with a great variety of homostructrual or heterostructural atomic stacking architectures to be integrated with the fabrication of large-area photovoltaic or optoelectronic devices based on the solution processes. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim[SDGs]SDG7Atoms; Convergence of numerical methods; Deposition; Irradiation; Optoelectronic devices; Oxygen vacancies; Perovskite; Perovskite solar cells; Photodegradation; Self assembly; Temperature; Titanium dioxide; Electron transporting materials; Low- temperature process; Organic-inorganic; Solution process; Solution processable; Solution-processed; Stacking architecture; UV transparencies; Solar cellsjournal article10.1002/aenm.2017017222-s2.0-85029354402