Organo lead halide perovskite absorbers were prepared by a two-step solution-processing method under ambient air conditions. Large cuboid crystalline grains that form a porous surface in junction with an organic hole conductor enable power conversion efficiency up to 15.3%, exhibiting minimal J–V hysteresis and stable performance against light intensity change. The cell without encapsulation showed sufficiently high stability under exposure to air.
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Wu et al. (2014) studied this question.
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