Abstract
All-inorganic perovskite CsPbI2Br thin films are formed by the dual-source thermal evaporation of CsBr and PbI2. The resultant perovskite layers possess a uniform and dense microstructure with a bandgap of 1.97 eV. Planar heterojunction perovskite solar cells are fabricated using TiO2 and spiro-OMeTAD charge-transporting layers in the regular n-i-p form. The devices exhibit a best efficiency of 5.7%. Thermal stability evaluation is performed at 85 °C under atmosphere, and ~ 85% of the initial efficiency is maintained after 24 h.
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