Perovskite solar cells are regarded as a promising alternative for the next generation solar cells. Despite a significant improvement in their power conversion efficiency (PCE), the dependence of open circuit voltage (Voc )on material parameters has not been fully understood. We have derived two analytical expressions for the Voc in perovskite solar cells as a function of material parameters, such as electron (hole) mobility µe (µh ) ,electron-carrier concentration (n),effective density of states of holes at the at the valence band edge(Nv), photo generation rate G , active layer thickness(d)and electron drift velocity(Ve ). It is found that using perovskite materials with low V N , higher electronhole mobility ratio (µe/µh ), and larger active layer thickness at high light intensity can lead to higher OC V and hence higher PCE in perovskite solar cells, which agree well with experimental results. These results may provide useful guidance in selecting materials leading to higher Voc and hence PCE in perovskite solar cells.
|Number of pages||8|
|Journal||International Journal of Global Advanced Materials and Nanotechnology|
|Publication status||Published - 12 Jun 2018|