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Simultaneous improvement of Jsc, Voc and FF of polymer solar cells with CuI as hole transport layer

  • 1.

    Department of Mechanical and Electrical Engineering, Chuzhou Vocational and Technical College, Chuzhou 239000, China

  • 2.

    School of Mechanical and Electronic Engineering, Chuzhou University, Chuzhou 239000, China

  • 3.

    School of Foreign Languages, Chuzhou University, Chuzhou 239000, China.

Funds:  Supported by the University Natural Science Research Project of Anhui Province (KJ2017A417, KJ2015A153), Scientific Research Starting Fund of Chuzhou University (2016qd05).
Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2017.07.010
More Information
  • Author Bio:

    SU Hetang, male, born in 1966, Master/Associate Professor. Research field: Solar cells, machine electricity. E-mail: chuzhoushu@163.com

  • Corresponding author: YU Wenjuan
  • Received Date: 16 December 2016
  • Rev Recd Date: 17 July 2017
  • Publish Date: 31 July 2017
    Abstract

  • Abstract

    A novel buffer layer copper iodide (CuI) was introduced into PCDTBT, PC70BM polymer solar cells (PSCs), where the CuI acts simultaneously as of hole transport layer (HTL) and electron block layer (EBL). Through depositing the CuI between the polymer and Ag and Au anodes, the hole collection ability has been increased. By optimizing the thickness of CuI and top anode, simultaneous enhancement of short-circuit current density (Jsc), open-circuit voltage (Voc), and fill factor (FF) has been achieved, leading to a dramatic increase of device efficiency, from 0.67% to 5.47% with 3 nm CuI and Au anode in comparison with the device without CuI. With thicker CuI, the efficiency decreases noticeably both for Au and Ag anodes due to the block effect. The result indicates that the CuI is an effective buffer layer for PCDTBT, PC70BM PSCs.

    Abstract

    A novel buffer layer copper iodide (CuI) was introduced into PCDTBT, PC70BM polymer solar cells (PSCs), where the CuI acts simultaneously as of hole transport layer (HTL) and electron block layer (EBL). Through depositing the CuI between the polymer and Ag and Au anodes, the hole collection ability has been increased. By optimizing the thickness of CuI and top anode, simultaneous enhancement of short-circuit current density (Jsc), open-circuit voltage (Voc), and fill factor (FF) has been achieved, leading to a dramatic increase of device efficiency, from 0.67% to 5.47% with 3 nm CuI and Au anode in comparison with the device without CuI. With thicker CuI, the efficiency decreases noticeably both for Au and Ag anodes due to the block effect. The result indicates that the CuI is an effective buffer layer for PCDTBT, PC70BM PSCs.
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    • References(20)
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    HE Z C, ZHONG C M, SU S J, et al. Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure[J]. Nature Photonics, 2012, 6(9): 593-597.
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    WANG Haitao, ZHANG Wenfeng, CHENG Boxue, et al. Enhancing power conversion efficiency of polymer solar cells via treatment of PEDOT: PSS anode buffer layer using DMF solvent[J]. Journal of University of Science and Technology of China,2012, 42(10): 775-784.
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    BLOM P W M, MIHAILETCHI V D, KOSTER L J A, et al. Device physics of polymer: Fullerene bulk heterojunction solar cells[J]. Advanced Materials, 2007, 19 (12): 1551-1566.
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    LIU J, SHAO S Y, FANG G. et al. High-efficiency inverted polymer solar cells with transparent and work-function tunable MoO3-Al composite film as cathode buffer layer[J]. Advanced Materials, 2012, 24(20): 2774-2779.
    [13]
    KUWABARA T, NAKAYAMA T, UOZUMI K, et al. Highly durable inverted-type organic solar cell using amorphous titanium oxide as electron collection electrode inserted between ITO and organic layer [J]. Solar Energy Materials & Solar Cells, 2008, 92(11): 1476-1482.
    [14]
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    [15]
    PARK S H, ROY A, BEAUPR S, et al. Bulk heterojunction solar cells with internal quantum efficiency approaching 100%[J]. Nature Photonics, 2009, 3(5): 297-302.
    [16]
    HE Z C, ZHONG C M, HUANG X, et al. Simultaneous enhancement of open-circuit voltage, short-circuit current density, and fill factor in polymer solar cells[J]. Advanced Materials, 2011, 23(40): 4636-4643.
    [17]
    PERERA V P S, TENNAKONE K. Recombination processes in dye-sensitized solid-state solar cells with CuI as the hole collector[J]. Solar Energy Materials & Solar Cells, 2003, 79(2): 249-255.
    [18]
    CHRISTIANS J A, FUNG R C, KAMAT P V. An inorganic hole conductor for organo-lead halide perovskite solar cells improved hole conductivity with copper iodide[J]. Journal of the American Chemical Society, 2014, 136(2): 758-764.
    [19]
    YOU J, CHEN C C, DOU L, et al. Metal oxide nanoparticles as an electron-transport layer in high-performance and stable inverted polymer solar cells[J]. Advanced Materials, 2012, 24(38): 5267-5272.
    [20]
    BISQUERT J. Chemical capacitance of nanostructured semiconductors: Its origin and significance for nanocomposite solar cells[J]. Physical Chemistry Chemical Physics, 2003, 5(24): 5360-5364.
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    [1]
    YIP H L, JEN K Y. Recent advances in solution-processed interfacial materials for efficient and stable polymer solar cells[J]. Energy Environment Science, 2012, 5(3): 5994-6011.
    [2]
    HE Z C, ZHONG C M, SU S J, et al. Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure[J]. Nature Photonics, 2012, 6(9): 593-597.
    [3]
    SUN Y, SEO J H., TAKACS C J, et al. Inverted polymer solar cells integrated with a low-temperature-annealed sol-gel-derived ZnO film as an electron transport layer[J]. Advanced Materials, 2011, 23(14): 1679-1683.
    [4]
    VANDEWAL K, GADISA A, OOSTERBAAN W D, et al. The relation between open-circuit voltage and the onset of photocurrent generation by charge-transfer absorption in polymer:fullerene bulk heterojunction solar cells[J]. Advanced Functional Materials, 2010, 18(14): 2064-2070.
    [5]
    LENES M, KOSTER L, MIHAILETCHI V D, et al. Thickness dependence of the efficiency of polymer: Fullerene bulk heterojunction solar cells[J]. Applied Physics Letters, 2006, 88 (24): 243502(1-3).
    [6]
    CHOI H W, LEE K S, ALFORD T L, et al. Optimization of antireflective zinc oxide nanorod arrays on seedless substrate for bulk-heterojunction organic solar cells[J]. Applied Physics Letters, 2012, 101(15): 153301(1-4).
    [7]
    STEIM R, KOGLER F R, BRABEC C J. Interface materials for organic solar cells[J]. Journal of Materials Chemistry, 2010, 20(13): 2499-2512.
    [8]
    谢丽欣, 赵雪梅, 赵志强, 等. 绕丹宁修饰富勒烯作为新型聚合物太阳能电池受体光伏材料增强光吸收[J]. 中国科学技术大学学报, 2014, 44(8): 623-626.
    XIE Lixin, ZHAO Xuemei, ZHAO Zhipqiang, et al. Rhodanine-containing fullerene derivative as a new acceptor in polymer solar cells with enhanced light absorption[J]. Journal of University of Science and Technology of China, 2014, 44(8):623-626.
    [9]
    王海涛, 章文峰, 陈博学, 等. 利用溶剂DMF处理聚合物太阳能电池的PEDOT:PSS阳极缓冲层提高能量转换效率[J]. 中国科学技术大学学报, 2012, 42(10): 775-784.
    WANG Haitao, ZHANG Wenfeng, CHENG Boxue, et al. Enhancing power conversion efficiency of polymer solar cells via treatment of PEDOT: PSS anode buffer layer using DMF solvent[J]. Journal of University of Science and Technology of China,2012, 42(10): 775-784.
    [10]
    BLOM P W M, MIHAILETCHI V D, KOSTER L J A, et al. Device physics of polymer: Fullerene bulk heterojunction solar cells[J]. Advanced Materials, 2007, 19 (12): 1551-1566.
    [11]
    YIP H L, HAU S K, BAEK N S, et al. Polymer solar cells that use self-assembled-monolayer-modified ZnO/Metals as cathodes[J]. Advanced Materials, 2008, 20(12): 2376-2382.
    [12]
    LIU J, SHAO S Y, FANG G. et al. High-efficiency inverted polymer solar cells with transparent and work-function tunable MoO3-Al composite film as cathode buffer layer[J]. Advanced Materials, 2012, 24(20): 2774-2779.
    [13]
    KUWABARA T, NAKAYAMA T, UOZUMI K, et al. Highly durable inverted-type organic solar cell using amorphous titanium oxide as electron collection electrode inserted between ITO and organic layer [J]. Solar Energy Materials & Solar Cells, 2008, 92(11): 1476-1482.
    [14]
    BLOUIN N, MICHAUD A, LECLERC M. A low-bandgap poly(2,7-carbazole) derivative for use in high-performance solar cells[J]. Advanced Materials, 2007, 19 (17): 2295-2300.
    [15]
    PARK S H, ROY A, BEAUPR S, et al. Bulk heterojunction solar cells with internal quantum efficiency approaching 100%[J]. Nature Photonics, 2009, 3(5): 297-302.
    [16]
    HE Z C, ZHONG C M, HUANG X, et al. Simultaneous enhancement of open-circuit voltage, short-circuit current density, and fill factor in polymer solar cells[J]. Advanced Materials, 2011, 23(40): 4636-4643.
    [17]
    PERERA V P S, TENNAKONE K. Recombination processes in dye-sensitized solid-state solar cells with CuI as the hole collector[J]. Solar Energy Materials & Solar Cells, 2003, 79(2): 249-255.
    [18]
    CHRISTIANS J A, FUNG R C, KAMAT P V. An inorganic hole conductor for organo-lead halide perovskite solar cells improved hole conductivity with copper iodide[J]. Journal of the American Chemical Society, 2014, 136(2): 758-764.
    [19]
    YOU J, CHEN C C, DOU L, et al. Metal oxide nanoparticles as an electron-transport layer in high-performance and stable inverted polymer solar cells[J]. Advanced Materials, 2012, 24(38): 5267-5272.
    [20]
    BISQUERT J. Chemical capacitance of nanostructured semiconductors: Its origin and significance for nanocomposite solar cells[J]. Physical Chemistry Chemical Physics, 2003, 5(24): 5360-5364.
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