The present study investigates the effect of the interface defects for ultrathin Cu (In1-xGax) Se2 solar cells using Silvaco TCAD. The initial simulation study is carried out with the reference cell configuration in which the PV parameters fit and match the fabricated cell characteristics. Our goal is to investigate the temperature dependence of the performance of u-CIGS solar cells in the temperature range of 10-70 °C and the loss mechanism caused by interface trap density (Dit) in different cell pitch sizes on cell performance. Dit defines the amount of carrier's traps at CIGS/Al2O3 interface to recombine with photogenerated carriers. The recombination mechanisms are found to play a crucial role in cell performance degradation. Further simulations quantify significant improvements in Jsc and Voc for different cell pitch sizes at a fixed opening width in the Al2O3 layer. Consequently, the optimum efficiency has been pointed out at a cell pitch size of 1.5 μm. MgF2 has been used as an ARC layer to boost the efficiency up to 14 %. The results from these simulations provide insights for passivated u-CIGS solar cell optimization.
Photogeneration losses from interface trap density in Passivated Ultrathin CIGS Solar Cell
Boukortt N. E. I.;Patane S.;
2022-01-01
Abstract
The present study investigates the effect of the interface defects for ultrathin Cu (In1-xGax) Se2 solar cells using Silvaco TCAD. The initial simulation study is carried out with the reference cell configuration in which the PV parameters fit and match the fabricated cell characteristics. Our goal is to investigate the temperature dependence of the performance of u-CIGS solar cells in the temperature range of 10-70 °C and the loss mechanism caused by interface trap density (Dit) in different cell pitch sizes on cell performance. Dit defines the amount of carrier's traps at CIGS/Al2O3 interface to recombine with photogenerated carriers. The recombination mechanisms are found to play a crucial role in cell performance degradation. Further simulations quantify significant improvements in Jsc and Voc for different cell pitch sizes at a fixed opening width in the Al2O3 layer. Consequently, the optimum efficiency has been pointed out at a cell pitch size of 1.5 μm. MgF2 has been used as an ARC layer to boost the efficiency up to 14 %. The results from these simulations provide insights for passivated u-CIGS solar cell optimization.Pubblicazioni consigliate
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