Photoactive Layer Design Rules for Efficient and Stable Nonfullerene Solar Cells

Abstract

The efficiency of organic photovoltaics have seen a phenomenal increase in the last couple of years with the discovery of small molecule nonfullerene acceptors (NFAs). Molecular design strategies of the photoactive layer have boosted the performance with intelligent interface engineering beyond 18% so far. One way to boost the performance of the NFA devices is to add a third component in the photoactive layer, known as ternary approach. Most of the record efficiency devices have been reported adopting this strategy in the field of OPV. However, there is still a lack of understanding how to design a third component to achieve both efficient and stable devices with no burn-in at the first 100h of operation. In order to bring OPV technology into commercial applications in solar windows, building integrated PV, agrivoltaics or even in integrated circuits one would need not only efficient but also reliable devices. In this talk, I will focus on how to design the photoactive layer components and morphology so that we would have state-of-the-art performances along with improved photostability.