Alkyl Side-Chain Engineering of Non-Fullerene Acceptors for Large-Area Organic Solar Cells
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초록
내용
The development of non-fullerene acceptors (NFAs) recently led to important breakthroughs in the field of polymer solar cells (PSCs). Both the large-area manufacturing and eco-friendly processing are considered as key issues for the commercialization of PSCs. Here, we developed very simple-structured NFAs for high-efficiency PSCs. Previously, we reported an impressive power conversion efficiency (PCE) of 11.55% using highly crystalline symmetric NFA in a PTB7-Th-based ternary-blend device. Here, the facile asymmetric strategy could effectively improve both the material properties and device performance without sacrificing facile synthesis and physical properties that well match those of the PTB7-Th polymer donor, resulting in a PCE of 12.01% in single-junction ternary-blend devices and a PCE of 9.32% in large-area NFA-OSC modules (substrate size = 100 cm2, aperture size = 55.5 cm2) under ambient conditions using a D-bar coater.