Perovskite Photovoltaics for Dim-Light Applications

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 approximate to 27.4%, no hysteresis behavior, and an exceptionally low maximum power point voltage variation of approximate to 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.