Stretchable Efficient Organic Solar Cells via Semiconductor Plasticizing Strategy

ABSTRACT Organic solar cells play a crucial role in wearable optoelectronic devices, but achieving both high efficiency and mechanical stretchability simultaneously remains challenging. Recently Shao's group reported a small molecule acceptor (BTP‐Si4) with both mechanical toughness and electrical properties, and the synergistic enhancement of power conversion efficiency (PCE >16%) and mechanical properties ( ε > 95%) was achieved for the first time through the optimized blending with the polymer donor PNTB6‐Cl. The universal law of molecular structure–compatibility–mechanical properties is systematically revealed, which provides a guiding program for the design of stretchable photovoltaic materials.