Enhancement of exciton separation in indoor perovskite photovoltaics by employing conjugated organic chromophores.

Indoor photovoltaics (IPVs) are favored for their speciality to provide sustainable and reliable energy for low-power electronic devices. As an ideal IPVs material, perovskite has been well explored in recent years. Herein, we focus on enhancing the photoelectric properties of the perovskite crystal under low light. By introducing N , N ′-bis(dimethylaminopropyl- N ‴-oxide)-perylene-3,4,9,10-tetracarboxidiimide (PDINO) into the perovskite, the crystallinity degree of the perovskite films are proven to be improved by synchrotron-based grazing incidence X-ray diffraction, thereby effectively enhancing the exciton transmission and separation in the perovskite. By using ultrafast spectroscopy, the influence of the optimized charge separation inside the perovskite under low light has been systematically analyzed. The final optimal perovskite solar cell showed an impressive indoor power conversion efficiency (PCE) of 37.9% under 1000 lux low light, and a PCE of 21.3% under 1 sun illumination. These findings proved doping of the perovskite by strong electron acceptors as a valid strategy for efficient charge transport, paving the way to their applications as IPVs. • The PDINO molecules can optimize the perovskite crystals formation and effectively reduce the defects in the film. • Analyzing tDOS and ultrafast spectroscopy, the defects passivation and the optimization of exciton separation were revealed. • A ∼37.9% efficient (1000 lux) indoor PSC is obtained based on PDINO-based device. [ABSTRACT FROM AUTHOR]