Conversion efficiency of strained wurtzite In_xGa_1−x N/ZnSnN₂ core/shell quantum dot solar cells under external electric field

Abstract

In this study, the conversion efficiency (CE), open-circuit voltage (V_OC) and short-circuit current density (J_SC) of wurtzite In_xGa_1−xN/ZnSnN₂ core/shell quantum dot (QD) solar cells are studied by using the detailed balance model. The effects of strain and external electric field have been considered. The results show that with the increase of the core size, the V_OC increases, while the J_SC and CE decrease. With the increase of shell size or In content, the V_OC decreases, while the J_SC and CE increase. In addition, our calculations show that the band gap of QD increases due to strain, which leads to an increase of the V_OC, but decreases of the CE and J_SC. By contrast, the situation is opposite under the effect of external electric field.