物理化学学报 >> 2013, Vol. 29 >> Issue (08): 1735-1744.doi: 10.3866/PKU.WHXB201305241

电化学和新能源 上一篇    下一篇

聚(3-己基噻吩)作为光谱增感层在有机太阳电池光谱响应增强中的应用

吴振武1,2, 刘扬3, 韦尚江4, 黄训4, 张东煜2, 周明3, 陈立桅4, 马昌期2, 王华1   

  1. 1 太原理工大学新材料工程技术研究中心, 新材料界面科学与工程教育部重点实验室, 太原030024;
    2 中国科学院苏州纳米技术与仿生研究所, 印刷电子技术研究中心, 江苏苏州 215123;
    3 中国科学院苏州纳米技术与仿生研究所, 纳米生物医学研究部, 江苏苏州 215123;
    4 中国科学院苏州纳米技术与仿生研究所, 国际实验室, 江苏苏州 215123
  • 收稿日期:2013-03-29 修回日期:2013-05-20 发布日期:2013-07-09
  • 通讯作者: 王华, 马昌期 E-mail:wanghua001@tyut.edu.cn;cqma2011@sinano.ac.cn
  • 基金资助:

    国家自然科学基金(91123034, 61274056)和山西省科技创新重点团队(2012041011)资助项目

Spectrum Response Enhancement of Organic Solar Cell Using a Poly(3-hexylthiophene) Photosensitizing Layer

WU Zhen-Wu1,2, LIU Yang3, WEI Shang-Jiang4, HUANG Xun4, ZHANG Dongyu2, ZHOU Ming3, CHEN Liwei4, MA Chang-Qi2, WANG Hua1   

  1. 1 Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, 030024, P. R. China;
    2 Printable Electronics Research Center, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, P. R. China;
    3 Division of Nanobiomedicine, SINANO, Chinese Academy of Sciences, Suzhou 215123, P. R. China;
    4 International Laboratory, SINANO, Chinese Academy of Sciences, Suzhou 215123, P. R. China
  • Received:2013-03-29 Revised:2013-05-20 Published:2013-07-09
  • Contact: WANG Hua, MA Chang-Qi E-mail:wanghua001@tyut.edu.cn;cqma2011@sinano.ac.cn
  • Supported by:

    The project was supported by the National Natural Sciene Foundation of China (91123034, 61274056) and Shanxi Provincial Key Innovative Research Team in Science and Technology, China (2012041011).

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摘要：

报道了利用聚(3-己基噻吩)(P3HT)作为前置缓冲层来弥补(4,8-双-(2-乙基己氧基)-苯并[1,2-b:4,5-b']二噻吩)-(4-氟代噻并[3,4-b]噻吩(PBDT-TT-F):[6,6]-苯基-C61-丁酸甲酯(PC61BM)共混体相异质结(BHJ)电池对450-600 nm处光谱响应不足的新的器件结构设计思路. 光谱带隙为1.8 eV的PBDT-TT-F 在550-700 nm处有很强的光谱吸收, 在有机太阳电池器件上有很好的应用潜能. 但其在350-550 nm处的吸收不强, 影响了器件对太阳光谱的利用效率. 与此相比, P3HT薄膜的光谱吸收主要在450-600 nm范围内, 同PBDT-TT-F 形成良好的互补关系. 新设计的器件外量子效率(EQE)研究结果表明, 利用P3HT 作为前置缓冲层可以与PBDT-TT-F:PC61BM薄膜中的PC61BM形成平面异质结, 从而拓展了器件在450-600 nm处的光谱响应范围,实现光谱增感作用. 优化P3HT的厚度为20 nm左右, 器件对外输出的短路光电流密度从11.42 mA·cm-2提高到12.15 mA·cm-2, 达到了6.3%的提升.

关键词: 有机太阳电池, 新型太阳电池结构, 光谱增感层, 聚(3-己基噻吩), 光谱响应增强

Abstract:

We report here the photovoltaic performance of a solar cell using poly-{[4,8-bis[(2-ethylhexyl) oxy]-benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-alt-[3-fluore-2-(octyloxy)carbonyl-thieno[3,4-b]thiophene-4,6- diyl]} (PBDT-TT-F):[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the photoactive layer in combination with a thin poly(3-hexylthiophene) (P3HT) film as a photosensitizing layer. PBDT-TT-F strongly absorbs light in the wavelength range of 550-700 nm, but it absorbs relatively weakly in the range of 350-550 nm. In contrast, a P3HT film shows intensive absorption ability in the 450-600 nm region, suggesting that the absorptions of these two materials complement each other to give a broad range. An organic solar cell with the structure indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene)- polystyrenesulfonic acid (PEDOT:PSS)/P3HT/ PBDT-TT-F:[6,6]-phenyl C61-butyric acid methyl ester (PC61BM)/LiF/Al was fabricated in which P3HT was deposited between the hole transporting layer (PEDOT: PSS) and bulk heterojunction (BHJ) photoactive layer (PBDT-TT-F:PC61BM). This solar cell exhibited improved spectrum response in the wavelength range of 450-600 nm compared with one without a P3HT layer, which is attributed to the photosensitizing effect of the P3HT film. Optimization of the thickness of P3HT led to an increase of short-circuit current density (JSC) from 11.42 to 12.15 mA·cm-2.

Key words: Organic solar cell, New solar cell structure, Photosensitizing layer, Poly(3-hexylthiophene), Spectrum response enhancement

MSC2000: 

  • O649