Heterojunction Incorporating Perovskite and Microporous Metal–Organic Framework Nanocrystals for Efficient and Stable Solar Cells

• Main Authors: Xuesong Zhou, Lele Qiu, Ruiqing Fan, Jian Zhang, Sue Hao, Yulin Yang
• Format: Article
• Language: English
• Published: SpringerOpen 2020-03-01
• Series: Nano-Micro Letters
• Subjects: Metal–organic framework; Nanocrystal; Heterojunction; Light-harvesting layer; Perovskite solar cell
• Online Access: http://link.springer.com/article/10.1007/s40820-020-00417-1
• ISSN: 2311-6706; 2150-5551

Abstract In this paper, we present a facile approach to enhance the efficiency and stability of perovskite solar cells (PSCs) by incorporating perovskite with microporous indium-based metal–organic framework [In12O(OH)16(H2O)5(btc)6]n (In-BTC) nanocrystals and forming heterojunction light-harvesting layer. The interconnected micropores and terminal oxygen sites of In-BTC allow the preferential crystallization of perovskite inside the regular cavities, endowing the derived films with improved morphology/crystallinity and reduced grain boundaries/defects. Consequently, the In-BTC-modified PSC yields enhanced fill factor of 0.79 and power conversion efficiency (PCE) of 20.87%, surpassing the pristine device (0.76 and 19.52%, respectively). More importantly, over 80% of the original PCE is retained after 12 days of exposure to ambient environment (25 °C and relative humidity of ~ 65%) without encapsulation, while only about 35% is left to the pristine device.