The Effect of Adsorbent Layer Thickness and Gallium Concentration on the Efficiency of a Dual-Junction Copper Indium Gallium Diselenide Solar Cell

  • Maryam Hedayati
  • Saeed OlyaeeEmail author
  • Seyed Mohamad Bagher Ghorashi


The split of the sunlight spectrum by the bandgap energy of multi-junction solar cells is a highly effective way to increase solar cell efficiency. The reason is that the energy of photons is effectively absorbed, and there is a reduction in solar cell loss. In this contribution, we report on the performance of a double-junction copper gallium diselenide/copper indium gallium diselenide (CGS/CIGS) solar cell with a cadmium sulfide (CdS) buffer layer simulator. The JV characteristics and the external quantum efficiency were simulated under AM1.5 illumination. Increased efficiency was seen as a result of the change in the thickness of layers and different molar ratio amounts of gallium, and the optimal amount of each factor was obtained. In this study, a single CGS solar cell was used as the top cell and a single CIGS solar cell as the bottom cell in the tandem configuration, which showed conversion efficiencies of 16.175% and 15.696%, respectively. Finally, solar cell efficiency of 32.3% was obtained in the double-junction state, an increase of 6% compared with the reference cell.


Numerical simulation four-terminal solar cell CGS/CIGS double-junction solar cells efficiency 


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© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Nano-photonics and Optoelectronics Research Laboratory (NORLab), Faculty of Electrical EngineeringShahid Rajaee Teacher Training University (SRTTU)Lavizan, TehranIran
  2. 2.Atomic and Molecular Group, Faculty of PhysicsUniversity of KashanKashanIran

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