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In recent years amorphous silicon solar cells have been receiving a great deal of interest due to their high energy conversion efficiency and low cost. The positions of absorption peak reflect the good absorption performance at specific frequency point or nearby spectra. However, the absorption peaks of amorphous silicon solar cell which are mainly determined by the properties of amorphous silicon and metal electrode, cannot be tuned. And the absorption efficiency can not be further enhanced also. Therefore, monolayer graphene film will be employed in the solar cells with periodic structure due to its remarkable electro-optic properties. With a suitable chemical potential applied, the dielectric constant of graphene can be tuned. This design mainly aims to tune the position of the absorption peak based on the graphene by using finite-difference frequency-domain method. Also, an approximate fitted function is developed in order to overcome the singularity in the exact expression. Numerical results show that the approximate closed form expression generates results within a maximum absolute error of 0.8%. Theoretical results provide the realistic organic thin-film solar cells with theoretical basis and technical support.
[1] Carlson D E, Wronski C R 1976 Appl. Phys. Lett. 28 671
[2] Sha W E I, Choy W C H, Chew W C 2010 Opt. Express 18 5993
[3] Wei Y, Xiao F, Wu B, Huang Z X, Wu X L 2014 Acta. Photon. Sin. 43 62 (in Chinese) [魏源, 肖峰, 吴博, 黄志祥, 吴先良 2014 光子学报 43 62]
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[5] Bao Q L, Kian P L 2012 ACS Nano 6 3677
[6] Wu H Q 2013 Chin. Phys. B 22 098106
[7] Nair R R, Blake P, Grigorenko A N, Novoselov K S, Booth T J, Stauber T, Peres N M R, Geim A K 2008 Science 320 1308
[8] Wang F, Zhang Y B, Tian C S, Girit C, Zettl A, Crommie M, Shen Y R 2008 Science 320 206
[9] Liu M, Yin X B, Ulin-Avila E, Geng B, Zentgraf T, Ju L, Wang F, Zhang X 2011 Nature 474 64
[10] Lu Z L, Zhao W S 2012 J. Opt. Soc. Am. B 29 1490
[11] Schwierz F 2010 Nat Nanotechnol 5 487
[12] Wu L, Chu H S, Koh W S, Li E P 2010 Opt. Express 18 14395
[13] Vakil A, Engheta N 2011 Science 10 1291
[14] Peierls R 1935 Annals de l'I. H. P. 5 177
[15] Landau L 1937 Phys. Z. Sowjetunion 11 26
[16] Yin W H, Han Q, Yang X H 2012 Acta Phys. Sin. 61 248502 (in Chinese) [尹伟红, 韩勤, 杨晓红 2012 61 248502]
[17] beilenhoff K, Heinrich W, Hartnagel H L 1992 IEEE T. Microw. Theory. 40 540
[18] Simsek E 2013 Opt. Lett. 38 1437
[19] Li Z Q, Henriksen E A, Jiang Z, Hao Z, Martin M C, Kim P, Stormer H L, Basov D N 2008 Nat. Phys. 4 532
[20] Chew W C 1990 Waves and Fields in Inhomogeneous Media (New York: Van Nostrand Reinhold) p121
[21] Wang H, Huang Z X, Wu X L, Ren X G 2011 Chin. Phys. B 20 114701
[22] Lu S L, Wu X L, Ren X G, Mei Y S, Shen J, Huang Z X 2012 Acta Phys. Sin. 61 194701 (in Chinese) [鲁思龙, 吴先良, 任信钢, 梅诣偲, 沈晶, 黄志祥 2012 61 194701]
[23] Ren X G, Sha W E I, Choy W C H 2013 Opt. Express 21 31824
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[1] Carlson D E, Wronski C R 1976 Appl. Phys. Lett. 28 671
[2] Sha W E I, Choy W C H, Chew W C 2010 Opt. Express 18 5993
[3] Wei Y, Xiao F, Wu B, Huang Z X, Wu X L 2014 Acta. Photon. Sin. 43 62 (in Chinese) [魏源, 肖峰, 吴博, 黄志祥, 吴先良 2014 光子学报 43 62]
[4] Novoselov K S, Geim A K, Morozov S V 2004 Science 306 666
[5] Bao Q L, Kian P L 2012 ACS Nano 6 3677
[6] Wu H Q 2013 Chin. Phys. B 22 098106
[7] Nair R R, Blake P, Grigorenko A N, Novoselov K S, Booth T J, Stauber T, Peres N M R, Geim A K 2008 Science 320 1308
[8] Wang F, Zhang Y B, Tian C S, Girit C, Zettl A, Crommie M, Shen Y R 2008 Science 320 206
[9] Liu M, Yin X B, Ulin-Avila E, Geng B, Zentgraf T, Ju L, Wang F, Zhang X 2011 Nature 474 64
[10] Lu Z L, Zhao W S 2012 J. Opt. Soc. Am. B 29 1490
[11] Schwierz F 2010 Nat Nanotechnol 5 487
[12] Wu L, Chu H S, Koh W S, Li E P 2010 Opt. Express 18 14395
[13] Vakil A, Engheta N 2011 Science 10 1291
[14] Peierls R 1935 Annals de l'I. H. P. 5 177
[15] Landau L 1937 Phys. Z. Sowjetunion 11 26
[16] Yin W H, Han Q, Yang X H 2012 Acta Phys. Sin. 61 248502 (in Chinese) [尹伟红, 韩勤, 杨晓红 2012 61 248502]
[17] beilenhoff K, Heinrich W, Hartnagel H L 1992 IEEE T. Microw. Theory. 40 540
[18] Simsek E 2013 Opt. Lett. 38 1437
[19] Li Z Q, Henriksen E A, Jiang Z, Hao Z, Martin M C, Kim P, Stormer H L, Basov D N 2008 Nat. Phys. 4 532
[20] Chew W C 1990 Waves and Fields in Inhomogeneous Media (New York: Van Nostrand Reinhold) p121
[21] Wang H, Huang Z X, Wu X L, Ren X G 2011 Chin. Phys. B 20 114701
[22] Lu S L, Wu X L, Ren X G, Mei Y S, Shen J, Huang Z X 2012 Acta Phys. Sin. 61 194701 (in Chinese) [鲁思龙, 吴先良, 任信钢, 梅诣偲, 沈晶, 黄志祥 2012 61 194701]
[23] Ren X G, Sha W E I, Choy W C H 2013 Opt. Express 21 31824
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