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International Journal of Photoenergy
Volume 2014, Article ID 568648, 8 pages
http://dx.doi.org/10.1155/2014/568648
Research Article

The Effects of Annealing Parameters on the Crystallization and Morphology of Cu(In,Ga)Se2 Absorber Layers Prepared by Annealing Stacked Metallic Precursors

1Department of Mechanical Engineering, Lunghwa University of Science and Technology, Taoyuan 33306, Taiwan
2Department of Mechanical Engineering, China University of Science and Technology, Taipei 11581, Taiwan

Received 24 February 2014; Revised 7 May 2014; Accepted 7 May 2014; Published 11 June 2014

Academic Editor: Ho Chang

Copyright © 2014 Chia-Ho Huang and Dong-Cherng Wen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

CIGS films are prepared by single-stage annealing of the solid Se-coated In/Cu-Ga bilayer precursor. The annealing processes were performed using various Ar pressures, heating rates, and soaking times. A higher Ar pressure is needed to fabricate highly crystalline CIGS films, as no extra Se-vapor source is supplied. As the heating rate increases, the surface morphologies of the CIGS films become looser and some cracks are observed. However, the influence of soaking time is insignificant and the selenization process only requires a short time when the precursors are selenized at a higher temperature with a lower heating rate and a higher Ar pressure. In this study, a dense chalcopyrite CIGS film with a thickness of about 1.5-1.6 μm, with large grains ( 1.2 μm) and no cracking or peeling is obtained after selenizing at a temperature of 550°C, an Ar pressure of 300 Torr, a heating rate of 60°C/min, and a soaking time of 20 min. By adequate design of the stacked precursor and controlling the annealing parameters, single-stage annealing of the solid Se-coated In/Cu-Ga bilayer precursor is simplified for the fabrication of a fully crystallized chalcopyrite CIGS absorber layers with good crystallization and large grains.