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)
aState Key Laboratory for Supramolecular Structure and Materials, Jilin University, Changchun 130012, China; bThe Analysis and Testing Experimental Center, Jilin University, Changchun 130021, China; cKey Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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.
Received: 17 August 2007
Revised: 18 October 2007
Accepted manuscript online:
Fund: 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
Cite this article:
Wang Ya-Nan(王亚楠), Zhou Yin-Hua(周印华), Xu Yue(徐跃), Sun Xiao-Bo(孙晓波), Wu Wei-Cai(吴伟才), Tian Wen-Jing(田文晶), and Liu Yun-Qi(刘云圻) X-shape oligo(thiophene)s as donor materials for vacuum-deposited organic photovoltaic cells 2008 Chin. Phys. B 17 1448
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