Abstract
Black Phosphorus (BP) has shown great potential in optoelectronic devices due to its remarkable semiconductor properties. Herein, liquid-exfoliated BP nanosheets is doped into poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) to form a hybrid hole transport layers (HTLs). The incorporation of BP nanosheets in PEDOT:PSS dramatically changes the nanostructure and electrical conductivity of film. The BP doped PEDOT:PSS HTLs possess excellent charge selectivity and transport capability, which are proved in non-fullerene and fullerene blend system based polymer solar cells (PSCs). Furthermore, the nanostructure of PM6:Y6 light absorber changes a lot after introduction of BP nanosheets. Thus, weak charge recombination loss, high exciton generation rate and dissociation probability, and low transport resistance are observed in BP nanosheets doped PEDOT:PSS HTLs based cells, which result in improved power conversion efficiency (PCE). As a result, significant improvement of PCE (>18%) is observed in both non-fullerene and fullerene blend systems based cells. This result demonstrates a simple and effective strategy to form efficient HTLs in high-efficiency PSCs.
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