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Influence of the thickness and cathode material on the performance of the polymer solar cell

Wen Yuan-Xin Yu Huang-Zhong

Influence of the thickness and cathode material on the performance of the polymer solar cell

Wen Yuan-Xin, Yu Huang-Zhong
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  • The solar cells based on the blend of MEH-PPV(poly(2-methoxy-5-(2'-ethylhexyloxy) -1,4-phenylene vinylene)) and PCBM (1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6)C61) as acceptor were fabricated. The thickness dependence of the performance of solar cells was studied. The results showed that the solar cells with active layer thickness of 100 nm have the best performance. Increasing device thickness resulted in an increase of charge recombination and a lowering of the fill factor, which leads to lower overall power conversion efficiency. The reasons for the S-shaped kink in the thick device were also analyzed. Influence of the cathode material on the performance of the devices was discussed. The results showed that the solar cells using LiF/Al as the negative electrode formed ohmic contacts at the cathode and anode, which favored the collecting of the charge, increased the transmission of the charge and the absorption of solar light, and improved the performance of the solar cell.
    • Funds:
    [1]

    Yu G, Gao J, Hummelen C, Wudl F, Heeger A J 1995 Science 270 1789

    [2]

    Chen J W, Cao Y 2009 Acc. Chem. Res. 42 1709

    [3]

    Li G, Shrotriya V, Huang J S, Yao Y, Moriarty T, Emery K, Yang Y 2005 Nat. Mater. 4 864

    [4]

    Wang E G, Wang L, Lan L F, Peng J B, Cao Y 2008 Appl. Phys. Lett. 92 033307

    [5]

    Liang Y, Xu Z, Xia J, Tsai S, Wu Y, Li G, Ray C, Yu L 2010 Adv. Mater. 22 1

    [6]

    He Y J, Chen H Y, Hou J H, Li Y F 2010 J. Am. Chem. Soc. 132 1377

    [7]

    Wang Y, Hou Y B, Tang A W, Feng Z H, Feng B, Li Y, Teng F 2009 Nanoscale Research Letters 4 674

    [8]

    Yu H Z, Peng J B 2008 Chin. Phys. B 17 3143

    [9]

    Feng Z H, Hou Y B, Shi Q M, Qin L F, Li Y, Zhang L, Liu X J, Teng F, Wang Y S, Xia R D 2010 Chin. Phys. B 19 038601

    [10]

    Sang G Y, Zou Y P, Huang Y, Zhao G J, Yang Y, Li Y F 2009 Appl. Phys. Lett. 94 193302

    [11]

    Zhou Y H, Yang Z F, Wu W C, Xia H J, Wen S P, Tian W J 2007 Chin. Phys. 16 2136

    [12]

    You H L, Zhang C F 2009 Chin. Phys. B 18 2096

    [13]

    Yu H Z, Peng J B, Liu J C 2009 Acta Phys. Sin. 58 669 (in Chinese)[於黄忠、彭俊彪、刘金成 2009 物理学报 58 669]

    [14]

    Zhang Y, de B B, Blom P W M 2010 Phys. Rev. B 81 085201

    [15]

    Xu M, Peng J B 2010 Acta Phys. Sin. 59 2131 (in Chinese) [徐 苗、彭俊彪 2010 物理学报 59 2131]

    [16]

    Yu H Z, Peng J B 2008 Organic Electronic 9 1022

    [17]

    Zheng L P, Zhou Q M, Deng X Y, Yuan M, Yu G, Cao Y 2004 J. Phys. Chem. B 108 11921

    [18]

    Tan Z A, Yang C H, Zhou E J, Wang X, Li Y F 2007 Appl. Phys. Lett. 91 023509

    [19]

    Yu H Z, Peng J B, Zhou X M 2008 Acta Phys. Sin. 57 3898 (in Chinese)[於黄忠、彭俊彪、周晓明 2008 物理学报 57 3898]

    [20]

    Shirland F 1966 Adv. Energy. Conversion 6 201

    [21]

    Mihailetchi V D, Wildeman J, Blom P W M 2005 Phys. Rev. Lett. 94 126602

    [22]

    Kumar A, Sista S, Yang Y J 2009 Appl. Phys. 105 094512

    [23]

    Glatthaar M, Riede M, Keegan N, Sylvester-Hvid K, Zimmermann B, Niggemann M, Hinsch A, Gombert A 2007 Sol. Energy Mater. Sol. Cells 91 390

    [24]

    Gadisa A, Svensson M, Mats R, Inganas O 2004 Appl. Phys. Lett. 84 1609

    [25]

    Brabec C J, Cravino A, Meissner D, Sariciftci N S, Fromherz T, Rispens M T, Sanchez L, Hummelen J C 2001 Adv. Funct. Mater. 11 374

    [26]

    Liu J, Shi Y J, Yang Y 2001 Adv. Funct. Mater. 11 420

    [27]

    Mihailetchi V D, Blom P W M, Hummelen J C,Rispens M T 2003 J. Appl. Phys. 94 6849

    [28]

    Bassler H 1993 Phys. Status Solidi 175 15

    [29]

    Veenstra S C, Heeres A, Hadziioannou G, Sawatzky G A, Jonkman H T 2002 Appl. Phys. A: Mater. Sci. Process 75 661

  • [1]

    Yu G, Gao J, Hummelen C, Wudl F, Heeger A J 1995 Science 270 1789

    [2]

    Chen J W, Cao Y 2009 Acc. Chem. Res. 42 1709

    [3]

    Li G, Shrotriya V, Huang J S, Yao Y, Moriarty T, Emery K, Yang Y 2005 Nat. Mater. 4 864

    [4]

    Wang E G, Wang L, Lan L F, Peng J B, Cao Y 2008 Appl. Phys. Lett. 92 033307

    [5]

    Liang Y, Xu Z, Xia J, Tsai S, Wu Y, Li G, Ray C, Yu L 2010 Adv. Mater. 22 1

    [6]

    He Y J, Chen H Y, Hou J H, Li Y F 2010 J. Am. Chem. Soc. 132 1377

    [7]

    Wang Y, Hou Y B, Tang A W, Feng Z H, Feng B, Li Y, Teng F 2009 Nanoscale Research Letters 4 674

    [8]

    Yu H Z, Peng J B 2008 Chin. Phys. B 17 3143

    [9]

    Feng Z H, Hou Y B, Shi Q M, Qin L F, Li Y, Zhang L, Liu X J, Teng F, Wang Y S, Xia R D 2010 Chin. Phys. B 19 038601

    [10]

    Sang G Y, Zou Y P, Huang Y, Zhao G J, Yang Y, Li Y F 2009 Appl. Phys. Lett. 94 193302

    [11]

    Zhou Y H, Yang Z F, Wu W C, Xia H J, Wen S P, Tian W J 2007 Chin. Phys. 16 2136

    [12]

    You H L, Zhang C F 2009 Chin. Phys. B 18 2096

    [13]

    Yu H Z, Peng J B, Liu J C 2009 Acta Phys. Sin. 58 669 (in Chinese)[於黄忠、彭俊彪、刘金成 2009 物理学报 58 669]

    [14]

    Zhang Y, de B B, Blom P W M 2010 Phys. Rev. B 81 085201

    [15]

    Xu M, Peng J B 2010 Acta Phys. Sin. 59 2131 (in Chinese) [徐 苗、彭俊彪 2010 物理学报 59 2131]

    [16]

    Yu H Z, Peng J B 2008 Organic Electronic 9 1022

    [17]

    Zheng L P, Zhou Q M, Deng X Y, Yuan M, Yu G, Cao Y 2004 J. Phys. Chem. B 108 11921

    [18]

    Tan Z A, Yang C H, Zhou E J, Wang X, Li Y F 2007 Appl. Phys. Lett. 91 023509

    [19]

    Yu H Z, Peng J B, Zhou X M 2008 Acta Phys. Sin. 57 3898 (in Chinese)[於黄忠、彭俊彪、周晓明 2008 物理学报 57 3898]

    [20]

    Shirland F 1966 Adv. Energy. Conversion 6 201

    [21]

    Mihailetchi V D, Wildeman J, Blom P W M 2005 Phys. Rev. Lett. 94 126602

    [22]

    Kumar A, Sista S, Yang Y J 2009 Appl. Phys. 105 094512

    [23]

    Glatthaar M, Riede M, Keegan N, Sylvester-Hvid K, Zimmermann B, Niggemann M, Hinsch A, Gombert A 2007 Sol. Energy Mater. Sol. Cells 91 390

    [24]

    Gadisa A, Svensson M, Mats R, Inganas O 2004 Appl. Phys. Lett. 84 1609

    [25]

    Brabec C J, Cravino A, Meissner D, Sariciftci N S, Fromherz T, Rispens M T, Sanchez L, Hummelen J C 2001 Adv. Funct. Mater. 11 374

    [26]

    Liu J, Shi Y J, Yang Y 2001 Adv. Funct. Mater. 11 420

    [27]

    Mihailetchi V D, Blom P W M, Hummelen J C,Rispens M T 2003 J. Appl. Phys. 94 6849

    [28]

    Bassler H 1993 Phys. Status Solidi 175 15

    [29]

    Veenstra S C, Heeres A, Hadziioannou G, Sawatzky G A, Jonkman H T 2002 Appl. Phys. A: Mater. Sci. Process 75 661

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  • Received Date:  09 June 2010
  • Accepted Date:  30 June 2010
  • Published Online:  15 March 2011

Influence of the thickness and cathode material on the performance of the polymer solar cell

  • 1. (1)Department of Physics, South China University of Technology, Guangzhou 510640, China; (2)Department of Physics, South China University of Technology, Guangzhou 510640, China;State Key Lab of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Abstract: The solar cells based on the blend of MEH-PPV(poly(2-methoxy-5-(2'-ethylhexyloxy) -1,4-phenylene vinylene)) and PCBM (1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6)C61) as acceptor were fabricated. The thickness dependence of the performance of solar cells was studied. The results showed that the solar cells with active layer thickness of 100 nm have the best performance. Increasing device thickness resulted in an increase of charge recombination and a lowering of the fill factor, which leads to lower overall power conversion efficiency. The reasons for the S-shaped kink in the thick device were also analyzed. Influence of the cathode material on the performance of the devices was discussed. The results showed that the solar cells using LiF/Al as the negative electrode formed ohmic contacts at the cathode and anode, which favored the collecting of the charge, increased the transmission of the charge and the absorption of solar light, and improved the performance of the solar cell.

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