Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 217-222.doi: 10.3866/PKU.WHXB201111111

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

Investigation on Photocurrent Polarity of a Bulk Heterojunction Organic Photovoltaic Device Using a Ferroelectric Thin Film

LI Bo   

  1. Department of Applied Physics, College of Science, Zhejiang University of Technology, Hangzhou 310023, P. R. China
  • Received:2011-09-06 Revised:2011-10-26 Published:2011-12-29
  • Contact: LI Bo
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61008008).

Abstract: The ferroelectric thin film of lead magnesium niobate-lead titanate (PMN-PT) was fabricated and characterized using UV-Vis transmission spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM). To determine the photocurrent properties of the bulk heterojunction organic blend film a photovoltaic device with the structure of tin indium oxide (ITO)/PMN-PT/organic blend film/aluminum (Al) was fabricated. Under modulated laser irradiation the amplitude and polarity of the transient photocurrent varied with the bias voltage, which shows that the photocurrent polarity of a conventional bulk heterojunction organic photovoltaic device is determined by the internal electric field that is induced by the difference between the work function of the anode and cathode electrodes. A new method is proposed for investigating the photocurrent properties of bulk heterojunction organic photovoltaic devices.

Key words: Ferroelectric thin film, Organics, Photovoltaic device, Bulk heterojunction, Transient photocurrent, Lead magnesium niobate-lead titanate, Polarity


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