ChemPhysChem · 2018 · 425 citations · 45 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials ChemistrySemiconductor MaterialsThin FilmsPerovskite MaterialsPhotovoltaic DevicesPhotovoltaic MaterialsSemiconductor Device MaterialsSolar Cell MaterialsSolar CellsBand GapCrystallinityEnergy Conversion EfficiencyFilm-forming AbilityPerovskite SemiconductorsPower ConversionPower Conversion EfficiencyThin-film Solar Cells
Abstract All‐inorganic double‐metal perovskite materials have recently gained much attention due to their three dimensionality (3D) and non‐toxic nature to replace lead‐based perovskite materials. Among all those double perovskite materials, theoretical works have demonstrated that Cs 2 AgBiBr 6 shows high stability and possesses a suitable band gap for solar‐cell applications. However, the film‐forming ability of Cs 2 AgBiBr 6 is found to be the utmost challenge hindering its development in thin‐film solar‐cell devices. In this work, a high‐quality Cs 2 AgBiBr 6 film with ultra‐smooth morphology, micro‐sized grains, and high crystallinity is realized via anti‐solvent dropping technology and post‐annealing at high temperature. After optimization, the first example of an inverted planar heterojunction solar‐cell device based on Cs 2 AgBiBr 6 exhibits a power conversion efficiency of 2.23 % with V OC =1.01 V, J SC =3.19 mA/cm 2 , and FF=69.2 %. Besides, the device shows no hysteresis and a high stability.
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