Kesterite CZTS nanocrystals: PH-dependent synthesis

Mahesh Suryawanshi, Seung Wook Shin, Woo Ri Bae, Kishor Gurav, Myun Gil Kang, Ganesh Agawane, Pramod Patil, Jae Ho Yun, Jeong Yong Lee, Annasaheb Moholkar, Jin Hyeok Kim

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The kesterite Cu 2 ZnSnS 4 (CZTS) nanocrystals (NCs) were successfully synthesized using a relatively simple and one-step hydrothermal route. The structural, compositional, and optical properties of the kesterite CZTS NCs have been studied in detail. The pH-dependent CZTS phase formation has been elucidated for the first time. The X-ray diffraction and Raman spectroscopy confirmed the formation of a main phase kesterite CZTS structure only at pH 7. However, for pH values (4.3, 5, and 9), the formation of CZTS alongwith few secondary phases like Cu 2 SnS 3 (CTS), Cu 2-x S, and SnS 2 /Sn 2 S 3 have been detected. CZTS NCs of size 10-100nm were obtained at 200°C and pH 7. The synthesized NCs showed a pH-dependent variation in optical band gap values from 1.15 to 1.44eV, which is near optimum value for low cost thin film solar cells.

Original languageEnglish (US)
Pages (from-to)1531-1534
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume211
Issue number7
DOIs
StatePublished - Jul 2014

Keywords

  • hydrothermal synthesis
  • solar cells
  • thin films

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