X. Song, N. Gasparini, M.M. Nahid, S.H. Kumar Paleti, J.-L. Wang, H. Ade, D. Baran
Joule, volume 3, issue 3, pp. 846-857, (2019)
The organic photovoltaics (OPV) landscape is nowadays facing a new era, ferried by the development of novel and stable acceptor materials, the so-called non-fullerene acceptors (NFAs), making the 15% power conversion efficiency (PCE) threshold no longer a research dream but a real goal. Despite the priority of high efficiency, the device longevity as well as the large area fabrication need to be addressed to make competitive organic solar cells with the other thin-film photovoltaic technologies. An elegant approach to overcome these limitations is the concept of ternary blend organic solar cells: three (or more) organic materials are combined from one hand to simultaneously enhance all photovoltaic parameters, which in turn will increase the power output of the solar cell. On the other hand, ternary blends have the potential to improve the device stability under light, thermal, and shelf-life conditions compared to traditional donor:acceptor blends.