[17p-Z35-1~12] 13.9 Compound solar cells

▲ [17p-Z35-3] The Advantage of Low Electron Affinity Materials as the Window Layer of Buffer-free CIGS₂ Solar Cells

〇(D)Dwinanri Egyna¹, Kazuyoshi Nakada¹, Akira Yamada¹ (1.Tokyo Tech)

Keywords:CIGS solar cell, window layer, open-circuit voltage

In this work, the property of a suitable alternative material for the window layer of a CIGS₂ solar cell was investigated through a numerical study using SCAPS-1D. The different material property was represented by the variation of the electron affinity of the window layer in the simulation. The various window/absorber designs were examined under several interface conditions from an ideal interface to an interface with high defect concentration. From the study, we found that materials with a low electron affinity was able to maintain high open-circuit voltage up to the ideal voltage even under the effect of high defect density. Therefore, we inferred that buffer-free CIGS₂ material is feasible by coupling a CIGS₂ absorber with an n-type material with low electron affinity property.