Efficient, thermally stable poly(3-hexylthiophene)based organic solar cells achieved by noncovalently fused-ring small molecule acceptors
발표자
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초록
내용
Organic solar cells (OSCs) based on poly(3-hexylthiophene) (P3HT) have achieved a significant enhancement of the power conversion efficiency (PCE), mainly driven by the development of nonfullerene small-molecule acceptors. However, their relatively poor thermal stability, in terms of blend morphology and concomitant performance, limits their application. Herein, we develop a non-covalently fused-ring acceptor (NFRA), denoted as CPDT–ICMe to achieve high-performance and thermally stable P3HT-based OSCs. Non-covalent interactions in CPDT–ICMe impart high planarity to its molecular backbone and facilitate strong intermolecular packing. A resulting P3HT:CPDT–ICMe OSC demonstrates superior electrical properties and a high PCE of 8.17%. Importantly, the P3HT:CPDT–ICMe OSC exhibits excellent thermal stability, maintaining 98.4% of initial PCE after 100 h of thermal annealing at 120 C.