Efficiency enhancement of CIGS solar cell by WS2 as window layer through numerical modelling tool. (1st September 2020) - Sobayel, K.
Highlights: This work emphasizes on modelling of TMDC material, WS2, as a potential window layer material for CIGS solar cell. So far none has reported on proposed new CIGS/WS2 structure. This research identifies the impact of interface defect state on the photovoltaic parameters of CIGS/WS2 solar cell and evaluates the tolerance of defect by numerical simulation. This research paves the way for WS2 thin film as a potential window layer material for CIGS solar cells. Abstract: Device modelling of copper indium gallium selenide (CIGS) solar cell with tungsten di-suphide (WS2 ) as a window layer has been carried out in order to achieve higher conversion efficiency. Conversion efficiency for all band-gap energies of CIGS were calculated based on proposed new CIGS/WS2 structure. Numerical modelling tools were used to investigate the effects conduction band offset and interface defect state on the photovoltaic parameters of CIGS/WS2 solar cell. The model predicts the density of defect tolerance in the interface is 1 × 10 11 cm 3 . Based on optimization, the highest efficiency of 26.4% has been achieved for CIGS/WS2 solar cell with Eg(CIGS) = 1.4 eV (Voc = 1.026 V, Jsc = 29.57 mA/cm 2 and FF = 86.96%) which is better than that of CIGS (23.4%) solar cell. The simulation further identifies that proposed CIGS/WS2 structure is less temperature sensitive compared to conventional Si solar cell. This research paves the way for WS2 thin film as a potential window layer material for CIGS solar cells.