Performance improvement of CdS/Cu(In,Ga)Se2 solar cells after rapid thermal annealing

doi:10.1088/1674-1056/22/1/018801

Abstract In this paper, we investigated the effect of rapid thermal annealing (RTA) on solar cell performance. An opto-electric conversion efficiency of 11.75% (V_oc= 0.64 V, J_sc= 25.88 mA/cm², FF=72.08%) was obtained under AM 1.5G when the cell was annealed at 300 ℃ for 30 s. The annealed solar cell showed an average absolute efficiency 1.5% higher than that of the as-deposited one. For the microstructure analysis and the physical phase confirmation, X-ray diffraction (XRD), Raman spectra, front surface reflection (FSR), internal quantum efficiency (IQE), and X-ray photoelectron spectroscopy (XPS) were respectively applied to distinguish the causes inducing the efficiency variation. All experimental results implied that the RTA eliminated recombination centers at the p-n junction, reduced the surface optical losses, enhanced the blue response of the CdS buffer layer, and improved the ohmic contact between Mo and Cu(In, Ga)Se₂ (CIGS) layers. This leaded to the improved performance of CIGS solar cell.

Keywords: CdS/Cu(In, Ga)Se₂ solar cell rapid thermal annealing performance improvement

Received: 27 April 2012
Revised: 15 July 2012
Accepted manuscript online:

PACS:	88.40.jn	(Thin film Cu-based I-III-VI2 solar cells)
	68.35.-p	(Solid surfaces and solid-solid interfaces: structure and energetics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60876045), the Shanghai Leading Basic Research Project, China (Grant No. 09JC1405900), the Shanghai Leading Academic Discipline Project, China (Grant No. S30105), and the R&D Foundation of SHU-SOENs PV Joint Lab, China (Grant No. SS-E0700601). Part measurement was supported by Analysis and Testing Center of Shanghai University, China.

Corresponding Authors: Ma Zhong-Quan
E-mail: zqma@shu.edu.cn

Cite this article:

Chen Dong-Sheng (陈东生), Yang Jie (杨洁), Xu Fei (徐飞), Zhou Ping-Hua (周平华), Du Hui-Wei (杜汇伟), Shi Jian-Wei (石建伟), Yu Zheng-Shan (于征汕), Zhang Yu-Hong (张玉红), Brian Bartholomeusz, Ma Zhong-Quan (马忠权) Performance improvement of CdS/Cu(In,Ga)Se₂ solar cells after rapid thermal annealing 2013 Chin. Phys. B 22 018801

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Performance improvement of CdS/Cu(In,Ga)Se2 solar cells after rapid thermal annealing

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Performance improvement of CdS/Cu(In,Ga)Se₂ solar cells after rapid thermal annealing