Improved efficiency of a large-area Cu(In,Ga)Se 2 solar cell by a nontoxic hydrogen-assisted solid Se vapor selenization process

Tsung Ta Wu, Fan Hu, Jyun Hong Huang, Chia Ho Chang, Chih Chung Lai, Yu Ting Yen, Hou Ying Huang, Hwen Fen Hong, Zhiming M. Wang, Chang Hong Shen, Jia Min Shieh, Yu Lun Chueh

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20 Citations (Scopus)


A nontoxic hydrogen-assisted solid Se vapor selenization process (HASVS) technique to achieve a large-area (40 × 30 cm 2 ) Cu(In,Ga)Se 2 (CIGS) solar panel with enhanced efficiencies from 7.1 to 10.8% (12.0% for active area) was demonstrated. The remarkable improvement of efficiency and fill factor comes from improved open circuit voltage (V oc ) and reduced dark current due to (1) decreased interface recombination raised from the formation of a widened buried homojunction with n-type Cd Cu participation and (2) enhanced separation of electron and hole carriers resulting from the accumulation of Na atoms on the surface of the CIGS film. The effects of microstructural, compositional, and electrical characteristics with hydrogen-assisted Se vapor selenization, including interdiffusion of atoms and formation of buried homojunction, were examined in detail. This methodology can be also applied to CIS (CuInSe 2 ) thin film solar cells with enhanced efficiencies from 5.3% to 8.5% (9.4% for active area) and provides a facile approach to improve quality of CIGS and stimulate the nontoxic progress in the large scale CIGS PV industry.

Original languageEnglish
Pages (from-to)4842-4849
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number7
Publication statusPublished - Apr 9 2014
Externally publishedYes


  • buried homojunction
  • hydrogen-assisted selenization
  • Na diffusion

ASJC Scopus subject areas

  • Materials Science(all)


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