Self-assembly atomic stacking transport layer of two-dimensional layered titania for perovskite solar cells with extended UV stability (by Prof. Chun-Wei Chen’s group)
A novel atomic stacking transporting layer (ASTL) based on two-dimensional (2D) atomic sheets of titania (Ti1-ðO2) was demonstrated in organic-inorganic lead halide perovskite solar cells. The atomically thin ASTL of 2D titania which was fabricated through the solution-processed atomic layer-by-layer deposition technique, showed superior inhibition of UV-degradation of perovskite solar cell devices, compared to the conventional high-temperature sintered TiO2 counterpart which usually caused the notorious instability of devices under UV irradiation. The atomically thin ASTL of 2D titania atomic sheets has shown several unique features including high-UV transparency, negligible (or very low) oxygen vacancies and being solution processable, making it as a promising electron transporting material in the development of stable and high-performance perovskite solar cells. Our 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 optoelectronics devices based on the solution processes. (This work has been published in Advanced Energy Materials, 8, 1701722,(2018))
