Role of anions in aqueous sol-gel process enabling flexible Cu(In,Ga)S2 thin-film solar cells

Yunjung Oh, Kyoohee Woo, Daehee Lee, Hongseuk Lee, Kyujin Kim, Inhyuk Kim, Zhaoyang Zhong, Sunho Jeong, Jooho Moon

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Recently, environmental-friendly, solution-processed, flexible Cu(In,Ga)(S,Se)2 devices have gained significant interest, primarily because the solution deposition method enables large-scale and low-cost production of photovoltaics, and a flexible substrate can be implemented on uneven surfaces in various applications. Here, we suggest a novel green-chemistry aqueous ink that is readily achievable through the incorporation of molecular precursors in an aqueous medium. A copper formate precursor was introduced to lower the fabrication temperature, provide compatibility with a polyimide plastic substrate, and allow for high photovoltaic performance. Through a comparative spectroscopic study on temperature-dependent chemical/crystal structural evolution, the chemical role of copper formate was elucidated, which led to the chalcopyrite framework that was appropriate to low-temperature annealed Cu(In,Ga)S2 absorber layers at 400 °C. This Cu(In,Ga)S2 solar cell exhibited a power conversion efficiency of 7.04% on a rigid substrate and 5.60% on a polymeric substrate. Our cell on the polymeric substrate also demonstrated both acceptable mechanical flexibility and durability throughout a repeated bending test of 200 cycles.

Original languageEnglish
Pages (from-to)17740-17747
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number20
DOIs
Publication statusPublished - 2014 Oct 22

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formic acid
Sol-gel process
Anions
Negative ions
Substrates
Copper
Bending tests
Ink
Polyimides
Temperature
Conversion efficiency
Solar cells
Durability
Thin film solar cells
Plastics
Fabrication
Crystals
Costs

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Oh, Yunjung ; Woo, Kyoohee ; Lee, Daehee ; Lee, Hongseuk ; Kim, Kyujin ; Kim, Inhyuk ; Zhong, Zhaoyang ; Jeong, Sunho ; Moon, Jooho. / Role of anions in aqueous sol-gel process enabling flexible Cu(In,Ga)S2 thin-film solar cells. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 20. pp. 17740-17747.
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Role of anions in aqueous sol-gel process enabling flexible Cu(In,Ga)S2 thin-film solar cells. / Oh, Yunjung; Woo, Kyoohee; Lee, Daehee; Lee, Hongseuk; Kim, Kyujin; Kim, Inhyuk; Zhong, Zhaoyang; Jeong, Sunho; Moon, Jooho.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 20, 22.10.2014, p. 17740-17747.

Research output: Contribution to journalArticle

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AU - Jeong, Sunho

AU - Moon, Jooho

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