摘要
The use of photovoltaic cells with an organometallic perovskite as the active layer for indoor dim-light energy harvesting is evaluated. By designing the electron-transporting materials and fabrication processes, the traps in the perovskite active layers and carrier dynamics can be controlled, and efficient devices are demonstrated. The best-performing small-area perovskite photovoltaics exhibit a promising high power conversion efficiency up to ≈27.4%, no hysteresis behavior, and an exceptionally low maximum power point voltage variation of ≈0.1 V under fluorescent lamp illumination at 100-1000 lux. The 5.44 cm 2 large-area device also shows a high efficiency of 20.4% and a promising long-term stability. Compared with the most efficient inorganic and organic solar cells nowadays, the competitive efficiency, low fabrication cost, and low raw material costs make perovskite photovoltaics ideal for indoor light harvesting and as Internet of Things power provider. Device engineering of perovskite photovoltaics dedicated to indoor dim-light applications is reported. The trap density in the perovskite layer is effectively eliminated by judiciously controlling the fabrication of the electron-transporting layers. Small-area lab cell and 5.44 cm 2 large-area device attain maximum efficiencies up to 27.4% and 20.4% under indoor illumination, respectively.