Photoluminescent delocalized excitons in donor polymers facilitate efficient charge generation for high-performance organic photovoltaics.

ABSTRACT: Efficient delocalization of photo-generated excitons is a key to improving the charge-separation efficiencies in state-of-the-art organic photovoltaic (OPV) absorber. While the delocalization in non-fullerene acceptors has been widely studied, we expand the scope by studying the properties of the conjugated polymer donor D18 on both the material and device levels. Combining optical spectroscopy, X-ray diffraction, and simulation, we show that D18 exhibits stronger π-π interactions and interchain packing compared to classic donor polymers, as well as higher external photoluminescence quantum efficiency (~26%). Using picosecond transient absorption spectroscopy and streak camera photoluminescence measurements, we show that the initial D18 excitons form delocalized intermediates, which decay

SUBMITTER: Jiang K 

PROVIDER: S-EPMC11968943 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature