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One of the traditional methods of preparing Cu (In, Ga) Se2 (CIGS) is the three-step co-evaporation. Using this technique, four elements of Cu, In, Ga, and Se form a parabolic Ga gradient distribution through their inter-diffusion and interaction. In this paper, CIGS films and solar cells with different Ga gradient distributions are prepared through adjusting the temperature of Ga source. The effects of different Ga gradients on structural and electrical properties of CIGS film surface and back surface are studied through a variety of measurement methods. The influences of surface conduction band offset value and back surface electric field on the performance of solar cell are investigated and analysed. Finally, an optimal Ga gradient distribution is obtained, where the spectral response is improved, and the solar cell shows better performance.
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Keywords:
- Cu(In,Ga)Se2 film solar cell /
- Ga gradient distribution /
- surface conduction band offset /
- back surface electric field
[1] Liu F F, Zhang L, He Q 2013 Acta Phys. Sin. 62 077201 (in Chinese) [刘芳芳, 张力, 何青 2013 62 077201]
[2] Marudachalam M, Birkmire R W, Hichri H 1997 J. Appl. Phys. 82 2869
[3] Schroeder D J, Berry G D A 1996 Appl. Phys. Lett. 69 4068
[4] Lundberg O, Edoff M, Stolt L 2005 Thin Solid Films 480 520
[5] Jung S H, Ahn S J, Yun J H, Gwak J Y, Kim D W, Yoon K H 2010 Current Appl. Phys. 10 990
[6] Gorji N E, Reggiani U, Sandrolini L 2012 Solar Energy 86 920
[7] Chen D S, Yang J, Xu F, Zhou P H, Du H W, Shi J W, Yu Z S, Zhang Y H, Bartholomeusz B, Ma Z Q 2013 Chin. Phys. B 22 284
[8] Liu F F, Zhang L, He Q 2013 Acta Phys. Sin. 62 077201 (in Chinese) [刘芳芳, 张力, 何青 2013 62 077201]
[9] Liu F F 2009 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [刘芳芳 2009 博士学位论文 (天津: 南开大学)]
[10] Dimmler B, Dittrich H, Menner R, Schock H W 1987 19th IEEE Photovoltaic Spec. Conf. (New York: IEEE) 1987 pp1454-1455
[11] Xue Y M 2007 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [薛玉明 2007 博士学位论文 (天津: 南开大学)]
[12] Gloeckler M 2005 Ph. D. Dissertation (Colorado: Colorado State University)
[13] Li W 2006 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [李伟 2006 博士学位论文 (天津: 南开大学)]
[14] Green M A 1992 Ph. D. Dissertation (Kensington: The University of New South Wales)
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[1] Liu F F, Zhang L, He Q 2013 Acta Phys. Sin. 62 077201 (in Chinese) [刘芳芳, 张力, 何青 2013 62 077201]
[2] Marudachalam M, Birkmire R W, Hichri H 1997 J. Appl. Phys. 82 2869
[3] Schroeder D J, Berry G D A 1996 Appl. Phys. Lett. 69 4068
[4] Lundberg O, Edoff M, Stolt L 2005 Thin Solid Films 480 520
[5] Jung S H, Ahn S J, Yun J H, Gwak J Y, Kim D W, Yoon K H 2010 Current Appl. Phys. 10 990
[6] Gorji N E, Reggiani U, Sandrolini L 2012 Solar Energy 86 920
[7] Chen D S, Yang J, Xu F, Zhou P H, Du H W, Shi J W, Yu Z S, Zhang Y H, Bartholomeusz B, Ma Z Q 2013 Chin. Phys. B 22 284
[8] Liu F F, Zhang L, He Q 2013 Acta Phys. Sin. 62 077201 (in Chinese) [刘芳芳, 张力, 何青 2013 62 077201]
[9] Liu F F 2009 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [刘芳芳 2009 博士学位论文 (天津: 南开大学)]
[10] Dimmler B, Dittrich H, Menner R, Schock H W 1987 19th IEEE Photovoltaic Spec. Conf. (New York: IEEE) 1987 pp1454-1455
[11] Xue Y M 2007 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [薛玉明 2007 博士学位论文 (天津: 南开大学)]
[12] Gloeckler M 2005 Ph. D. Dissertation (Colorado: Colorado State University)
[13] Li W 2006 Ph. D. Dissertation (Tianjin: Nankai University) (in Chinese) [李伟 2006 博士学位论文 (天津: 南开大学)]
[14] Green M A 1992 Ph. D. Dissertation (Kensington: The University of New South Wales)
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