中国物理B ›› 2008, Vol. 17 ›› Issue (4): 1448-1453.doi: 10.1088/1674-1056/17/4/050

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X-shape oligo(thiophene)s as donor materials for vacuum-deposited organic photovoltaic cells

刘云圻1, 王亚楠2, 周印华2, 孙晓波2, 吴伟才2, 田文晶2, 徐跃3   

  1. (1)Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China; (2)State Key Laboratory for Supramolecular Structure and Materials, Jilin University, Changchun 130012, China; (3)The Analysis and Testing Experimental Center, Jilin University, Changchun 130021, China
  • 收稿日期:2007-08-17 修回日期:2007-10-18 出版日期:2008-04-20 发布日期:2008-04-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 2002CB613401), the National Natural Science Foundation of China (Grant Nos 20474023 and 50673035), the Cooperation Research Project of National Natural Science Fo

X-shape oligo(thiophene)s as donor materials for vacuum-deposited organic photovoltaic cells

Wang Ya-Nan(王亚楠)a), Zhou Yin-Hua(周印华)a), Xu Yue(徐跃)b), Sun Xiao-Bo(孙晓波)c), Wu Wei-Cai(吴伟才)a), Tian Wen-Jing(田文晶)a)†, and Liu Yun-Qi(刘云圻)c)   

  1. a State Key Laboratory for Supramolecular Structure and Materials, Jilin University, Changchun 130012, China; b The Analysis and Testing Experimental Center, Jilin University, Changchun 130021, China; c Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2007-08-17 Revised:2007-10-18 Online:2008-04-20 Published:2008-04-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No 2002CB613401), the National Natural Science Foundation of China (Grant Nos 20474023 and 50673035), the Cooperation Research Project of National Natural Science Fo

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摘要： The films of two $x$-shape oligo(thiophene)s, 3, 4-dibithienyl-2, 5-dithienylthiophene (7T) and 2, 5-dibithienyl-3, 4-ditrithienylthiophene (11T), which are prepared by vacuum evaporation, have been investigated as novel electron donor layers in two-layer photovoltaic cells. UV--Vis absorptions show red-shifted and broadened absorptions of the vacuum-evaporated films as compared with those of the corresponding solutions and spin-coating films, which is beneficial for photovoltaic properties. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements show that the vacuum-evaporated films are almost amorphous. Two-layer photovoltaic cells have been realized by the thermal evaporation of 7T and 11T as donors and $N$, $N'-$bis(1-ethylpropyl)-3, 4:9,10-perylene bis(tetracarboxyl diimide) (EP-PTC) as an acceptor. An energy conversion efficiency (ECE) of 0.18{\%} of the cell based on 7T with an irradiation of white light at 100\,mw/cm$^{2}$ has been demonstrated by the measurements of current ($I$)- voltage ($V$) curves of the cells to be higher than the ECE of the reference system based on donor dihexylterthienyl (H3T) that is linear and without $\alpha $, $\beta $ linkage.

关键词: oligo(thiophene)s, vacuum-evaporated film, solar cell

Abstract: The films of two $x$-shape oligo(thiophene)s, 3, 4-dibithienyl-2, 5-dithienylthiophene (7T) and 2, 5-dibithienyl-3, 4-ditrithienylthiophene (11T), which are prepared by vacuum evaporation, have been investigated as novel electron donor layers in two-layer photovoltaic cells. UV--Vis absorptions show red-shifted and broadened absorptions of the vacuum-evaporated films as compared with those of the corresponding solutions and spin-coating films, which is beneficial for photovoltaic properties. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements show that the vacuum-evaporated films are almost amorphous. Two-layer photovoltaic cells have been realized by the thermal evaporation of 7T and 11T as donors and $N$, $N'-$bis(1-ethylpropyl)-3, 4:9,10-perylene bis(tetracarboxyl diimide) (EP-PTC) as an acceptor. An energy conversion efficiency (ECE) of 0.18% of the cell based on 7T with an irradiation of white light at 100 mw/cm$^{2}$ has been demonstrated by the measurements of current ($I$)- voltage ($V$) curves of the cells to be higher than the ECE of the reference system based on donor dihexylterthienyl (H3T) that is linear and without $\alpha $, $\beta $ linkage.

Key words: oligo(thiophene)s, vacuum-evaporated film, solar cell

中图分类号:  (X-ray diffraction)

  • 61.05.cp
78.40.Me (Organic compounds and polymers) 78.66.Qn (Polymers; organic compounds) 85.60.-q (Optoelectronic devices)