Highly efficient flexible CuIn 0.7 Ga 0.3 Se 2 solar cells with a thick Na/Mo layer deposited directly on stainless steel

Myeongho Lee, Seung Min Lee, Seungchul Jung, Seunggyu Ahn, Jun Sik Cho, Juhyeong Park, Yeongju Eh, Jihye Gwak, Keeshik Shin, Kyunghoon Yoon, Yong Soo Cho, Jae Ho Yun

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10 Citations (Scopus)


Bi-layered back contact structures consisting of Mo-capping and Na-doped Mo layers have been investigated for the purpose of providing extra Na for CuIn 0.7 Ga 0.3 Se 2 (CIGS) absorbers for high efficiency solar cells on a stainless steel substrate. This approach utilizing a thick back contact layer does not require a buffer layer on the substrate. The cell performance depends largely on the content of Na in the Mo:Na layer as Na easily diffuses into the absorber layer. The best cell efficiency of 15.04% is obtained for the cell incorporating the 600 nm Mo-capping and 900 nm 10% Na-incorporating Mo layers. This enhancement is attributed mainly due to the substantial increase of V oc as a result of higher carrier concentration and lower leakage current of the extra Na-involved absorber.

Original languageEnglish
Pages (from-to)562-566
Number of pages5
JournalApplied Surface Science
Publication statusPublished - 2015 Aug 15

Bibliographical note

Funding Information:
This research was financially supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Korean Ministry of Knowledge Economy (grant no. 10037233 ) and by KRCF (Korea Research Council of Fundamental Science & Technology) and KIER (Korea Institute of Energy Research) for the ‘NAP (National Agenda Project) program’.

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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