After finishing the gold evaporation and antireflective coating, the solar cells were measured using a 300-W Xenon light source from Oriel. The spectral mismatch between AM 1.5G and the solar simulator was calibrated by a Schott K113 Tempax filter (Prazosopms Glas & Optik GmbH). A silicon photodiode was used as light intensity calibrator for each measurement. Keithley 2400 was used for the current-voltage scan by applying an external voltage bias and measuring the response current with a scan rate of 50 mV/s. The cells were masked with a black metal mask with an area of 0.16 cm2. IPCE was recorded with a commercial apparatus (Aekeo-Ariadne, Cicci Research s.r.l.) based on a 300-W Xenon lamp. Stability of the cells was measured under a white light-emitting diode lamp with biologic MPG2 potentiostat and was performed under open air. The device area was masked to around 0.13 cm2. The spectral mismatch between AM 1.5G and the solar simulator was calibrated by a Schott K113 Tempax filter, whose light intensity was calibrated with a silicon diode. The light intensity was around 83 mW cm−2, and the actual current was adjusted according to in-time calibration result from the silicon diode. The stability data were acquired from the MPP tracking of a nonencapsulated device exposed to open air. The relative humidity of the ambient atmosphere varies from 40 to 60%. Upon higher humidity level, a mild nitrogen flow was applied to adjust the humidity to ~40%. Relative humidity was monitored by Sigma-Aldrich Humidity/Temperature Pen 445580.

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