LAUSR

Organic solar cells (OSCs) have made dramatic advancements during the past decades owing to the innovative material design and device structure optimization, with power conversion efficiencies surpassing 19% and 20% for single-junction and tandem devices, respectively. Interface engineering, by modifying interface properties between different layers for OSCs, has become a vital part to promote the device efficiency. It is essential to elucidate the intrinsic working mechanism of interface layers, as well as the related physical and chemical processes that manipulate device performance and long-term stability. In this article, the advances in interface engineering aimed to pursue high-performance OSCs were reviewed. The specific functions and corresponding design principles of interface layers were summarized firstly. Then we discussed the anode interface layer (AIL), cathode interface layer (CIL) in single-junction OSCs, and interconnecting layer (ICL) of tandem devices in separate categories and analyzed the interface engineering-related improvements on device efficiency and stability. Finally, the challenges and prospects associated with application of interface engineering were discussed with the emphasis on large-area, high-performance and low-cost device manufacturing. This article is protected by copyright. All rights reserved.