Multicomponent Blend Strategy for Enhanced Performance and Longevity in Organic Photovoltaics

Organic photovoltaics have made remarkable progress in recent years, achieving power conversion efficiencies of over 19% in laboratory-scale devices, marking a significant step towards their commercial viability. This advancement can be attributed to the integration of non-fullerene acceptor materials and the adoption of the multicomponent/ ternary blend approach within the organic photovoltaic technology.<br/>However, the organic photovoltaic community, focused on enhancing the power conversion efficiency, had previously overlooked the critical aspects of lifetime and stability issues for more than a decade. Recent efforts have focused on addressing these concerns, with numerous studies conducted to comprehend the degradation mechanisms and improve the overall longevity of organic photovoltaics.<br/>This presentation will delve into the development of the ternary blend approach, which has not only elevated the power conversion efficiency but also enhanced the open circuit voltage and fill factor. We will provide insights into the working principles and the underlying mechanisms governing the open circuit voltage in ternary systems, consisting of a polymer donor, a nonfullerene acceptor, and a fullerene acceptor. Furthermore, we will explore how this approach can effectively address stability issues linked to the commonly used zinc oxide electron transport layer, thereby significantly improving the photostability of organic photovoltaics.