npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Physics: Sae Mulli 2015; 65: 129-134

Published online February 27, 2015

Copyright © New Physics: Sae Mulli.

Effects of Heat Treatment in Air on Cu$_{2}$ZnSnS$_{4}$ Thin Films Fabricated by Using Spray Pyrolysis Deposition

Chan KIM1, Ilsu RHEE1, Sungwook HONG*2

1 Department of Physics, Kyungpook National University, Daegu 702-701, Korea
2 Division of Science Education, Daegu University, Gyeongsan 712-714, Korea


Received: December 11, 2014; Revised: January 27, 2015; Accepted: February 5, 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cu$_{2}$ZnSnS$_{4}$ (CZTS) thin films were fabricated by using spray pyrolysis deposition. CZTS ink was prepared from CuCl$_{2}$, ZnCl$_{2}$, SnCl$_{2}$, and thiourea (CH$_{4}$N$_{2}$S) powders that were dispersed in a mixed solution of 2-methoxyethanol and ethanolamine by using a sonochemical method. The films were fabricated by heat-treating the specimen in air and uniformly spraying CZTS ink on the glass. Heat treatment was performed at several different temperatures (300, 400, 500 $^\circ$C) and different durations (1, 2, 3 min). The best crystallinity and crystal size of the CZTS thin films were obtained at a temperature of 500 $^\circ$C for a 1-min treatment, according to X-ray diffraction measurement results. These results agree well with the data provided by the images of scanning electron microscopy. Furthermore, Hall-effect measurements on the sample confirmed that it was a p-type semiconductor and that its carrier concentration was 28.98 $\times$ 10$^{17}$ cm$^{-3}$.

Keywords: CZTS, Spray pyrolysis, Heat treatment in Air, Thin film, Solar cell

Cu$_{2}$ZnSnS$_{4}$ (CZTS) 박막을 스프레이 열분해 코팅방법으로 제작하였다. 스프레이 코팅을 위한 CZTS 용액은 2-methoxyethanol과 ethanolamine의 혼합 용액에 염화구리 (CuCl$_{2}$), 염화아연 (ZnCl$_{2}$), 염화주석 (SnCl$_{2}$), Thiourea (CH$_{4}$N$_{2}$S) 분말을 넣은 후 초음파로 분산시켜 제조하였다. 이 CZTS용액을 유리 기판에 고르게 분사한 후 공기 중에서 300, 400, 500 $^\circ$C 의 온도에서 각각 1, 2, 3분간 열처리하여 CZTS 박막을 형성하였다. X-선 회절 분석 결과 500 $^\circ$C 의 온도에서 1분간 열처리한 박막의 결정성과 결정립의 크기가 가장 우수하였으며, 이는 주사현미경으로 확인한 결정 알갱이의 크기 결과와 잘 일치하였다. 또한 이 박막은 홀 효과 측정으로 28.98 $\times$ 10$^{17}$ cm$^{-3}$ 의 전하 운반자 농도를 가지는 p-형 반도체임을 확인 하였다.

Keywords: CZTS, 스프레이, 공기 중 열처리, 박막, 태양전지

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