npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2012; 62: 289-293

Published online March 30, 2012 https://doi.org/10.3938/NPSM.62.289

Copyright © New Physics: Sae Mulli.

Effects of the Conditions of a Rapid Thermal Process for CIGS Films on the Characteristics of CIGS Solar Cells

Chan KIM1, Ilsu RHEE*1, Dae-Hwan KIM2

1Department of Physics, Kyungpook National University, Daegu 702-701

2Division of Energy Research, Institute of Science and Technology, Daegu 711-873

Correspondence to:ilrhee@knu.ac.kr

Abstract

Amorphous Cu(In,Ga)Se2 (CIGS) films were deposited on molybdenum-coated soda-lime glass by using a co-evaporation method and were crystallized by using a rapid thermal process (RTP). Several different conditions for the RTP were used to investigate the effects of those conditions on the composition and the crystallization of the CIGS films. Less loss of selenium and more crystallization were observed in the CIGS film heat-treated at atmospheric pressure than in the film heat-treated in vacuum. In the film heat-treated with a glass cover, the loss of selenium was found to be even less, but the crystallization was not sufficient for use in CIGS solar cells. CIGS solar cells with a structure of AZO/ZnO/CdS/CIGS/Mo were fabricated with the CIGS films heat-treated under various conditions, and their characteristics were measured. The characteristics of the CIGS solar cells improved with the use of well-crystallized CIGS film. The energy conversion efficiency was largest for the CIGS solar cell with a CIGS film heat-treated at atmospheric pressure with no glass cover and with continuous argon flow.

Keywords: A-CIGS, RTP, Crystallization, Solar cell, Efficiency

몰리브덴이 증착되어 있는 유리기판 위에 비정질 Cu(In,Ga)Se2 (CIGS) 박막을 동시증발 방법으로 증착한 후 급속열처리 과정을 거쳐 결정화시켰다. 이때 급속열처리 환경이 박막의 성분비와 결정화 정도에 미치는 영향을 관찰하였다. 진공에서보다 상압에서의 열처리가 Se의 소실은 줄이고, 결정 성장은 더 크게 만드는 것을 알 수 있었다. 그리고 덮게 유리를 이용한 경우에는 Se의 소실은 줄일 수 있었지만 태양전지에 사용할 정도로 결정성장이 충분히 되지 않는다는 것을 확인하였다. 이렇게 형성된 CIGS 박막들을 이용하여 AZO/ZnO/CdS/CIGS/Mo 구조의 태양전지를 제작하고 특성을 확인하였다. CIGS 태양전지의 특성은 결정이 크게 성장된 CIGS 박막을 이용한 태양전지에서 더 좋게 나왔으며, 덮게 유리 없이 아르곤 가스가 흐르는 상압에서 열처리를 한 CIGS를 이용한 태양전지 시료에서 가장 높은 에너지 변환효율인 4.0 %를 보여주었다.

Keywords: 비정질 CIGS, 급속열처리, 결정화, CIGS 태양전지, 효율

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