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Williams, Spencer T.
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article
Low-temperature processed high-performance flexible perovskite solar cells via rationally optimized solvent washing treatments
Abstract
High performance planar-heterojunction (PHJ) perovskite (CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>) solar cells fabricated through low-temperature annealing are demonstrated. Simple spin-coating with an optimized solvent washing process readily forms homogeneous and crystalline perovskite thin films. The perovskite films fabricated via this solvent washing process show a low dependence on annealing temperature in achieving high crystallinity and large grain size, prerequisites for high efficiency perovskite solar cells. The solar cell device fabricated by solvent washing and 100 °C annealing exhibited a high power conversion efficiency (PCE) over 14% with high short circuit current density (J<sub>SC</sub>) of 19.3 mA cm<sup>-2</sup> and fill factor (FF) of 0.80. More importantly, the device annealed at low temperature (