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Soft annealing effect on the properties of sputter grown Cu2ZnSnS4 (CZTS) thin films for solar cell applications

Pandharkar, Subhash, Punde, Ashvini, Nasane, Mamta, Doiphode, Vidya, Shinde, Pratibha, Vairale, Priti, Hase, Yogesh, Bhorde, Ajinkya, Waghmare, Ashish, Rondiya, Sachin, Prasad, Mohit and Jadkar, Sandesh 2020. Soft annealing effect on the properties of sputter grown Cu2ZnSnS4 (CZTS) thin films for solar cell applications. Materials Today: Proceedings 10.1016/j.matpr.2020.03.652

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In present study, CZTS films were fabricated using 2 different processes and their properties have been compared. The first is a 2-stage process which includes deposition of CZT followed by sulfurization and the second is a 3-stage process which includes deposition of identical CZT, soft annealing (pre-heating) and sulfurization. Structural, morphological, optical and compositional properties of CZTS films are investigated by XRD, Raman spectroscopy, FE-SEM, UV–Visible spectroscopy, EDS and photoresponse measurements. Structural analysis revealed that films prepared by both processes have polycrystalline kesterite-CZTS structure and exhibit prefered orientation along (1 1 2) direction. It has been observed that soft annealing temperature in 3-stage process significantly improve the crystal quality of CZTS films. Surface morphology of films sulfurized at 550 °C shows a uniform and compact micrograin (∼0.31 µm) without cracks. The soft annealing temperature significantly improves micrograin size (∼0.49 µm) and compactness of CZTS films. UV–Visible spectroscopy showed that the band gap of all CZTS films is in optimal range. The CZTS films fabricated by 3-stage process, exhibits high photocurrent response under intermittent visible-light irradiation, implying that they can useful as an absorber layer in solar cells.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Chemistry
ISSN: 2214-7853
Date of Acceptance: 24 March 2020
Last Modified: 13 Jul 2020 11:15

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