Simultaneous Improvement in Efficiency and Stability of Low-Temperature-Processed Perovskite Solar Cells by Interfacial Control (original) (raw)

2018, Advanced Energy Materials

layers and charge selecting buffer layers (i.e., electron-transporting layer (ETL) and hole-transporting layer (HTL)) are the key elements that determine the performance of PSCs. [5,8-12] The current state-of-the-art performance of PSCs is attained using high-temperature (≈500 °C)-sintered mesoporous TiO 2 as ETL, and spiro-OMeTAD as HTL. [1,2,13,14] In this type of PSC, the TiO 2 ETL is the process temperature determining material, while the perovskite active layers and HTLs can be prepared at relatively lower temperature (<150 °C). [2,4,5,10,15] To realize the PSC fabrication at lower temperature using various substrates, such as flexible plastics, [1,15,16] much effort has been made to develop high-performance low-temperature-processable ETLs for PSCs. [4,17-21] ZnO is a promising ETL candidate for PSCs because of easy solution processability, good optoelectronic properties, and appropriate work function. [18,19,22-30] Solution-processed ZnO has been successfully employed as ETL for other thin film solar cells such as organic photovoltaic devices and colloidal quantum dot solar cells. [23,26,29-33] Although there are some