Ester-Functionalized Poly(thiophene vinylene) Derivative for High-Performance Intrinsically-Stretchable Organic Solar Cells
발표자
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초록
내용
Poly(thiophene vinylene)s (PTVs) are an auspicious type of polymer donors (PDs) for organic solar cells (OSCs) owing to their simple chemical structures and straightforward synthesis. However, the structural rigidity of PTVs results in the formation of thin films with inadequate mechanical properties for the application in intrinsically stretchable (IS)-OSCs. In this work, we prepare a new ester-functionalized PTV with controlled molecular weights (MWs) (PETTCVT-X, X = L, M, and H) and demonstrate efficient and mechanically durable IS-OSCs. Both the mechanical stretchability and electrical properties of the PTVs are improved notably with increasing MW. Consequently, rigid-OSCs featuring a PTV with the highest MW (PETTCVT-H) exhibit the highest PCE (15.3%) and crack-onset strain (COS, 8.3%) among the series. Accordingly, the IS-OSCs utilizing PETTCVT-H present the highest initial PCE (10.1%) and stretchability (strain at PCE80% (retaining 80% of the initial PCE) = 16%). This work leverages the use of PTV for high-performance IS-OSCs.