Substrate and temperature dependence of the formation of the Earth abundant solar absorber Cu2ZnSnS4 by ex situ sulfidation of cosputtered Cu-Zn-Sn films

Melissa Johnson, Michael Manno, Xin Zhang, Chris Leighton, Eray Aydil

Research output: Contribution to journalArticle

Abstract

Copper zinc tin sulfide (CZTS) thin films were synthesized by ex situ sulfidation of Cu-Zn-Sn metal alloy precursor films cosputtered from Cu, Cu-Zn, and Cu-Sn targets onto five different substrate materials: single crystal quartz, fused quartz, sapphire, Pyrex, and soda lime glass (SLG). Cosputtered precursor films, which were found to consist of Cu, Zn, and Sn metals and Cu6.26Sn5 ordered alloys, were sulfidized between 100 and 600°C, corresponding to an S pressure range of 0.051-36 Torr. While CZTS forms at temperatures as low as 300°C on all substrates, the film's phase composition is dominated by binary metal sulfides between 300 and 400°C. Significant phase composition variations among films synthesized on different substrates begin to emerge at 400°C. Films grown on SLG are nearly phase pure CZTS by 500°C, with small amounts of ZnS. In contrast, films deposited on all other substrates persistently contain significant amounts of impurity phases such as SnS2 and Cu4Sn7S16 until the sulfidation temperature is increased to 600°C. Significant grain growth also begins between 500 and 600°C. At 600°C, CZTS films synthesized on SLG were found to have significantly larger grains than films grown on any of the other substrates. These results demonstrate that CZTS phase purity and grain size, properties that may affect solar cell performance, are affected by impurity diffusion from the SLG substrate, further emphasizing the importance of selecting appropriate substrates.

Original languageEnglish (US)
Article number061203
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume32
Issue number6
DOIs
StatePublished - Nov 1 2014

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Solar absorbers
sulfidation
absorbers
Earth (planet)
sulfides
temperature dependence
Tin
Zinc
Copper
calcium oxides
Substrates
tin
Lime
zinc
copper
Glass
Temperature
Quartz
glass
Metals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Substrate and temperature dependence of the formation of the Earth abundant solar absorber Cu2ZnSnS4 by ex situ sulfidation of cosputtered Cu-Zn-Sn films. / Johnson, Melissa; Manno, Michael; Zhang, Xin; Leighton, Chris; Aydil, Eray.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 32, No. 6, 061203, 01.11.2014.

Research output: Contribution to journalArticle

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