Compositional and structural properties of pulsed laser-deposited ZnS: Cr films

Mohammadreza Nematollahi*, Xiaodong Yang, Eivind Seim, Per Erik Vullum, Randi Holmestad, Ursula J. Gibson, Turid W. Reenaas

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

We present the properties of Cr-doped zinc sulfide (ZnS:Cr) films deposited on Si(100) by pulsed laser deposition. The films are studied for solar cell applications, and to obtain a high absorption, a high Cr content (2.0–5.0 at.%) is used. It is determined by energy-dispersive X-ray spectroscopy that Cr is relatively uniformly distributed, and that local Cr increases correspond to Zn decreases. The results indicate that most Cr atoms substitute Zn sites. Consistently, electron energy loss and X-ray photoelectron spectroscopy showed that the films contain mainly Cr2+ ions. Structural analysis showed that the films are polycrystalline and textured. The films with ~4 % Cr are mainly grown along the hexagonal [001] direction in wurtzite phase. The average lateral grain size decreases with increasing Cr content, and at a given Cr content, increases with increasing growth temperature.

Original languageEnglish
Article number84
Number of pages11
JournalApplied physics A: Materials science and processing
Volume122
Issue number2
DOIs
Publication statusPublished - 1 Feb 2016
Externally publishedYes

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