7/4/2023 0 Comments Download solar cabinExperimental proof is provided by the design and fabrication of quaternary OSCs with the reduced energetic disorders and the generation of trap states, where a “charge bridge” for charge transfer and transport through the interfacial region is constructed by regulating energy landscape with the introduced polymer donor and acceptor. Then, we show that a feasible “charge bridge” approach, which serves to decouple exciton-phonon interactions of bulk heterojunctions, brings an enhancement in device efficiency and photothermal stability by dredging non-radiative photocarrier trapping pathways. The kinetic fittings with exciton-exciton annihilation model demonstrate the intensitied exciton-phonon coupling under continuous photothermal stress. Herein, the signature of photocarrier trapping associated with exciton-phonon coupling is identified by investigating the pump fluence-dependent exciton diffusion and annihilation dynamics. The operational stability of high-performance organic solar cells (OSCs) based on Y-series small-molecule acceptors is hindered by strong photocarrier trapping processes as governed by thermodynamic relaxation in the mixed morphological domains.
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