Influence of Nanosemiconductor Materials on Thermal Stability of Solar Cells

In order to overcome the problem of long-term stability of perovskite solar cells, the author proposes a method to study the effects of nanosemiconductor materials on the thermal stability of solar cells. In this method, n = 3 and n = 1 (C₆H₅(CH₂)₂NH₃)₂(CH₃NH₃)_n-1Pbn I_3n+1 two-dimensional nanoperovskite films were investigated on glass substrates and indium tin oxide (ITO) substrates, respectively, on the thermal stability. Experimental results show that the glass-based nanoperovskite PMPI₃ film was partially decomposed into PbI₂ after being heated at 160°C. When the temperature reaches 180°C, the film is completely decomposed into PbI₂, and the perovskite PMPI₃ film with ITO as the substrate is completely decomposed into PbI₂ when the heating temperature reaches 140°C. The charge transfer between the perovskite film and the substrate is the physical reason for its easier thermal decomposition on the ITO substrate. Suggestions for improving the thermal stability of perovskite solar cell devices are given from the aspects of device design and fabrication process.