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微纳光栅结构增强聚合物太阳能电池光吸收的研究

李国龙 李进

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微纳光栅结构增强聚合物太阳能电池光吸收的研究

李国龙, 李进

The light absorption enhancement in polymer solar cells with periodic nano-structures gratings

Li Guo-Long, Li Jin
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  • 基于共轭聚合物给体材料P3HT和富勒烯衍生物受体材料PCBM共混的体异质结结构的聚合物太阳能电池, 因其空穴载流子迁移率低而限制了P3HT:PCBM功能层厚度,从而影响了器件对入射光的吸收. 在聚合物功能层表面引入微纳光栅结构可以使器件内电场重新分布并改善器件的光吸收. 本文基于时域有限差分方法仿真得到了光栅周期为1 μ,占空比为0.5以及入射波长分别为500和700 nm 时二维器件内光电场分布;并基于严格耦合波分析方法计算得到了不同光栅深度和光栅占空比的器件光吸收. 理论分析表明:插入微纳光栅结构后,由于光栅衍射增强作用使器件内出现了光聚焦现象;当占空比为0.5时, 光栅深度为10 nm的器件在入射波长为512 nm时,器件光学吸收增加了4.2%. 基于聚二甲基硅氧烷的微压印技术,制备了微纳光栅结构聚合物太阳能,器件结构为 ITO/PEDOT:PSS光栅层/P3HT:PCBM/LiF/Al.该器件与平板器件的性能对比实验证实, 通过在PEDOT:PSS上引入微纳光栅结构,器件能量转化效率增加了31%.
    The thickness of the active layer is limited by its low carrier mobility in the polymer solar cell composed of the blend bulk-heterojunction formed by P3HT as donor material and PCBM as acceptor material, which can affect the light absorption in the polymer solar cell. Nano-structure gratings inserted into polymer layer can redistribute the electrical field inside the device and improve its light absorption. Two-dimensional electrical field distributions inside the polymer solar cell are simulated with the grating period of 1 μ, fill ratio of 0.5 and incident wavelengths of 500 nm and 700 nm based on finite difference time domain. The light absorptions by the devices with different grating depths and fill ratios are calculated based on rigorous coupled wave. The analysis illustrates that light spots occur in the device due to the light diffraction caused by the gratings and the light absorption is increased by 4.2% with a grating fill ratio of 0.5, depth of 10 nm and an incident light wavelength of 512 nm. In experiment, nano-structure gratings are introduced into the devices by the micro-printing technology with PDMS and polymer solar cell is structured with ITO/ PEDOT:PSS gratings/ P3HT:PCBM/ LiF/ Al. The experimental results from the planar and the grating devices prove that the nano-structure gratings embedded in PEDOT:PSS layer increase the power conversion efficiency by 31%.
    • 基金项目: 宁夏科技支撑项目资助的课题.
    • Funds: Project supported by the Supported Science and Technology Program of Ningxia, China.
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    Li G, Shrotriya V, Huang J S, Yao Y, Moriarty T, Emery K, Yang Y 2005 Nature Mater. 4 864

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    [6]

    Li Y F 2012 Acc. Chem. Res. 45 723

    [7]

    Chen D, Nakahara A, Wei D, Nordlund D, Thomas P R 2011 Nano Lett. 11 561

    [8]

    Armbruster O, Lungenschmied C, Bauer S 2011 Phys. Rev. B 84 085208

    [9]

    Monestier F, Simon J J, Torchio P, Escoubas L, Flory F, Bailly S, Bettignies R, Stephane G, Defranoux C 2007 Sol. Energy Mater. Sol. Cells 91 405

    [10]

    Chen M X, Nilsson D, Kugler T, Berggren M, Remonen T 2002 Appl. Phys. Lett. 81 2011

    [11]

    Wang J Z, Gu J, Zenhausern F, Sirringhaus H 2006 Appl. Phys. Lett. 88 133502

    [12]

    Emelie P Y, Cagin E, Siddiqui J, Phillips J D, Fulk C, Garland J, Sivananthan S 2007 J. Electron. Mater. 36 841

    [13]

    Green M A, Jordan D 1998 Progress in Photovoltaics 6 169

    [14]

    Roman L S, Inganäs O, Granlund T, Nyberg T, Svensson M, Andersson M R, Hummelen J C 2000 Adv. Mater. 12 189

    [15]

    Nilsson D, Chen M X, Kugler T, Remonen T, Armgarth M, Berggren M 2002 Adv. Mater. 14 51

    [16]

    Boroumand F A, Fry P W, Lidzey D G 2005 Nano Lett. 5 67

    [17]

    Hohnholz D, Okuzaki H, MacDiarmid A G 2005 Adv. Func. Mater. 15 51

    [18]

    Lang U, Rust P, Dual J 2008 Microelectron. Eng. 85 1050

    [19]

    Halik M, Klauk H, Zschieschang U, Kriem T, Schmid G, Radlik W, Wussow K 2002 Appl. Phys. Lett. 81 289

    [20]

    Kang K S, Lim H K, Cho K Y, Han K J, Kim J 2008 J. Phys. D: Appl. Phys. 41 012003

    [21]

    Xia Y, Whitesides G M 1998 Angew. Chem. Int. Ed. Engl. 37 551

    [22]

    Xia Y, Whitesides G M 1998 Annu. Rev. Mater. Sci. 28 153

    [23]

    Quake S R, Scherer A 2000 Science 290 1536

    [24]

    Wei B, Ge D B 2010 Acta Phys. Sin. 54 648 (in Chinese) [魏兵, 葛德彪 2010 物理学报 54 648]

    [25]

    Moharam M G, Gaylord T K 1982 J. Opt. Soc. Am. 72 1385

    [26]

    Na S I, Kim S S, Jo J, Oh S H, Kim J, Kim D Y 2008 Adv. Funct. Mater. 18 3956

    [27]

    Liu X C, Chakraborty A, Parthasarathib G, Luo C 2007 Proc. SPIE 6556 655602

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出版历程
  • 收稿日期:  2012-04-16
  • 修回日期:  2012-05-07
  • 刊出日期:  2012-10-05

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