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A) Schematic illustration of an implemented device. B) J–V cures of the best‐performing PSCs without and with BTACl treatments under reverse and forward scans. C) PCE distribution histogram (obtained from 12 independent devices), D) EQE spectra, and E) steady power output measurements for the control and BTACl‐treated PSCs. F) Normalized PCE of the nonencapsulated devices aged in a nitrogen glove box.
