Reduced bimolecular charge recombination in efficient organic solar cells comprising non-fullerene acceptors.

ABSTRACT: Bimolecular charge recombination is one of the most important loss processes in organic solar cells. However, the bimolecular recombination rate in solar cells based on novel non-fullerene acceptors is mostly unclear. Moreover, the origin of the reduced-Langevin recombination rate in bulk heterojunction solar cells in general is still poorly understood. Here, we investigate the bimolecular recombination rate and charge transport in a series of high-performance organic solar cells based on non-fullerene acceptors. From steady-state dark injection measurements and drift-diffusion simulations of the current-voltage characteristics under illumination, Langevin reduction factors of up to over two orders of magnitude are observed. The reduced recombination is essential for the high fill factors

SUBMITTER: Wu Y 

PROVIDER: S-EPMC10033508 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature