Ricerc@Sapienza

CsPbBr3 perovskite is highly desired to fabricate many optoelectronic devices: high photovoltage solar cells, tandem solar cells, light-emitting diodes, lasers, photodetectors, field effect transistors etc. However, to realize these applications the resistance to humidity, one of the most important stressing agents, needs to be understood. In this article, we investigate the effect of prolonged exposure (up to 500h) of CsPbBr3 to ~60% and 80% relative humidity by in-situ X-ray diffraction and ex-situ scanning electron microscopy and UV-visible spectroscopy.

The fabrication of window layers more transparent than those based on amorphous silicon (a-Si:H) could be a key factor to enhance the efficiency of heterojunction (HJ) solar cells. In this work amorphous hydrogenated silicon oxide (a-SiOx:H) as a transparent passivating layer and substoichiometric tungsten oxide (WOx), with its wide band gap and high work function, are proposed to form efficient hole-selective contacts on silicon-based HJ solar cells. A comparison is made between WOx films grown by RF sputtering and by thermal evaporation.