| 초록 |
In recent years, inorganic-organic hybrid perovskite solar cells have drawn much attention due to the rapid increase in its efficiency using inexpensive, facile methods of deposition. The record efficiency of perovskite solar cells has already exceeded 20% using the standard ‘n-i-p’ structure which includes a high temperature processed mesoporous TiO2 layer infiltrated with a perovskite absorber layer. However, other perovskite solar cell structures, such as the more simple planar structure has failed to keep up in terms of efficiency. Yet it is still worth pursuing the planar structure as it is considered to have several advantages over its mesoporous counterpart, such as simplicity in fabrication, the absence of a high temperature processed mesoporous layer and less use of materials which are important factors to consider for the industrialization of perovskite photovoltaics. In this work, we introduce a compact SnO2 layer as a replacement for the traditional compact TiO2 layer to give comparable efficiencies at lower processing temperatures. The use of SnO2 is thought to be promising as it has higher electron mobility compared to TiO2, favorable band alignment with the absorber layer and can be processed at low enough temperatures for future applications in flexible perovskite solar cells. |
