Abstract
Besides the high-quality perovskite light absorbing layer, the electron and hole transport layers also play significant roles in achieving high-efficiency planar perovskite solar cells (PVSCs). In this study, a facile, environmentally friendly, one-step spinning coating method is employed to fabricate high-quality indium zinc oxide (IZO) electron transport layer (ETL). Improvements in charge transport, conductivity, and light transmittance of IZO ETL relative to that of TiO2-ETL should be responsible for the large short circuit current density of PVSCs. Using this optimized IZO ETL film, a high-power conversion efficiency (PCE) of 16.25% was achieved, which resulted in an absolute efficiency gain of 2.42% compared with TiO2-based PVSC (13.83%). A steady-state efficiency of 15.8% with negligible hysteresis was also demonstrated.
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