Journal of University of Science and Technology of China ›› 2010, Vol. 40 ›› Issue (7): 718-726.DOI: 10.3969/j.issn.0253-2778.2010.07.010
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HOU Zerong
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Abstract: A structure of Glass/FTO/CdS/CdTe/CdS based on the CdTe solar cell (Glass/FTO/CdS/CdTe) was adopted to study the effect of CdCl2 annealing treatment on the interdiffusion and the related reaction at the CdS/CdTe interface. Investigations show that surface morphology changs dramatically under different annealing treatment temperatures. The crystal size of CdS increases from 20 nm to 70 nm between 300~350 ℃. This temperature range is consistent with that of the CdS sphalerite to wurtzite phase transformation. CdS/CdTe interdiffusion happens at around 350 ℃, and CdS0.85Te0.15 with hexagonal-wurtzite structure is detected at 550 ℃. The CdS is quickly consumed up through interdiffusion with CdTe and forming CdSxTe1-x alloy. CdTeO3 begins to form at 450℃. Raman scattering shows that the intensity of CdS 1LO peak decreases from 350 ℃ and shifts to lower frequency, which reveals the formation of CdSxTe1-x. The XPS spectrum of samples confirms the formation of CdSxTe1-x and CdTeO3. CdCl2 protects CdS/CdTe from oxidation and promotes interdiffusion at the interface and formation of CdSxTe1-x during air annealing.
Key words: interface interdiffusion, CdS, CdTe, CdSxTe1-x, CdTe solar cell
HOU Zerong, WAN Lei, BAI Zhizhong, WANG Deliang. Effect of CdCl2 annealing treatment on interdiffusion and reaction at the CdS/CdTe interface[J]. Journal of University of Science and Technology of China, 2010, 40(7): 718-726.
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URL: http://just-cn.ustc.edu.cn/EN/10.3969/j.issn.0253-2778.2010.07.010
http://just-cn.ustc.edu.cn/EN/Y2010/V40/I7/718