Wide‐Bandgap Pyrazine‐Based Polymer Enables Efficient and Stable Organic Photovoltaic Modules for Multi‐Scene Applications †

Comprehensive Summary Organic photovoltaic (OPV) cells hold great promise as next‐generation green energy owing to their tunable photoelectronic properties and compatibility with large‐area solution printing. However, most high‐performance materials have been optimized primarily for standard sunlight, with limited strategies for multi‐spectral illuminations. Here, we report two wide‐bandgap donor polymers, PDBQx‐ γ and PDBQx‐ β , integrating a dibenzo[ f , h ]quinoxaline unit and a two‐dimensional benzodithiophene unit linked by alkyl‐thiophene π‐spacers. Optimized molecular design of PDBQx‐ β enables enhanced molecular packing, favorable morphology, and superior charge transport, delivering a power conversion efficiency (PCE) of 13.7% for PDBQx‐ β :FTCC‐Br based on single‐junction OPV cells under AM 1.5G illumination. Furthermore, the fabricated large‐area OPV modules (23.6 cm 2 ) achieve remarkable PCEs of 26.4% under 660 nm laser, 20.8% under underwater illumination, and 27.3% under indoor light. This study demonstrates a molecular design strategy for wide‐bandgap polymers intrinsically compatible with diverse light sources, advancing OPV technology toward multi‐scene applications.