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A mixed halide perovskite solar cell with a 1.72 eV bandgap is developed by incorporating Br into perovskite through a low-temperature solution process. A high efficiency of 13.1% is achieved by carefully tuning the thickness, morphology, and surface passivation of the perovskite layers. The fabrication techniques and conditions are compatible with future perovskite/Si tandem cell studies.
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Bi et al. (2014) studied this question.
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