Fig. 6: Dark stability test and cross-sectional SEM images of full NIP stack PSC devices.

a Thermal/humidity stability test under 85% H at 65 °C and b Humidity stability test under 70% H at room temperature for P3HT/ carbon, PEDOT/ carbon, and spiro/ gold PSCs, c False color cross-sectional SEM images of full stack nip carbon electrode PSCs with P3HT and d PEDOT (scale bar 200 nm).