The J-V curves were measured using a BioLogic VMP3 potentiostat in 4-wire sense configuration. All measurements (J-V dark, J-V light, stability and maximum power point tracking) were taken automatically without human interaction employing a high-throughput measurement technique developed by Surmiak et al. A 5 minutes break was applied where the devices were cooled down by a laminar flow of N2. The voltage step was set to 10 mV s -1 , starting voltage was in the reverse direction, and no bias conditioning or light soaking was applied. The working area of the devices was set to 0.1 cm 2 .