Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (08): 1735-1744.doi: 10.3866/PKU.WHXB201305241

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

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;
  • 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).


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


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