Emerging Approaches in Enhancing the Efficiency and Stability in Non-Fullerene Organic Solar Cells
The past three years have witnessed rapid growth in the field of organic solar cells (OSCs) based on non-fullerene acceptors (NFAs), with intensive efforts being devoted to material development, device engineering, and understanding of device physics. The power conversion efficiency of single-junction OSCs has now reached high values of over 18%. The boost in efficiency results from a combination of promising features in NFA OSCs, including efficient charge generation, good charge transport, and small voltage losses. In addition to efficiency, stability, which is another critical parameter for the commercialization of NFA OSCs, has also been investigated. This review summarizes recent advances in the field, highlights approaches for enhancing the efficiency and stability of NFA OSCs, and discusses possible strategies for further advances of NFA OSCs. ; Funding Agencies|National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21704021, 21805288]; European Commission Marie Skodowska-Curie action [843872]; Stiftelsen for Strategisk Forskning through a Future Research Leader program [FFL18-0322]; Swedish Research Council VRSwedish Research Council [2016-06146, 2018-05484, 2018-06048]; Swedish Energy AgencySwedish Energy Agency [43691-1]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]