Considering the technical standards required for wearable electronics, such as mechanical robustness, the development of fully stretchable OSCs (f-SOSCs) should be accelerated. Concurrently, f-SOSCs offer an intriguing platform for testing the mechanical and electrical properties of new polymeric materials. This presentation will discuss key studies aimed at making each layer of f-SOSCs both stretchable and efficient, with an emphasis on strategies to simultaneously enhance the photovoltaic and mechanical properties of the active layer. I will outline material design strategies to enhance the mechanical robustness of the PSCs as well as their power conversion efficiencies (PCEs). These strategies include; i) incorporating a high-molecular weight polymer acceptor as a tie molecule into active layers, ii) developing new electroactive polymers consisting of hard and soft segments and iii) developing new materials that improve molecular miscibility in the donor-acceptor blends. With these contributions, the f-SOSCs achieving over 14% PCE and high stretchability have been developed.
Organic solar cells (OSCs) have attracted research interest by their elastic character for wearable and stretchable devices. Especially all-polymer OSCs with same composition unit between donor and acceptor are enhanced their thermal stability and mechanical robustness. However, in most of OSCs, high elasticity often reduces the power conversion efficiency (PCE) by low charge transfer be cacused by weak aggregation of each donor and acceptor composite. In this study, new polymer acceptors consisted by the poly siloxane-spacer (PSS) with benzoditohiophene (BDT) and Y6 non-fullerene small molecule acceptor (NFSMA) derivative are synthesized and characterized for high performance and highly stretchable OSCs. The PSS unit has intrinsically stretchable property due to their rubber like structure, therefore introducing PSS unit as a building block in the OSC polymers suggests improve its own elasticity of the OSC polymers. In addition, introducing PSS unit increase solubility of OSC polymers, enabling high performance OSC by solution process using a non-halogenated green solvents. For example, all-polymer OSCs based on PSS containing polymer achieved more high PCE value (13.5 %) and crock-onset strain (COS = 15.2 %) than non-containing one (PCE = 9.8% and COS = 9.6%)
Conference Committee Involvement (6)
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