Investigation on Photocurrent Polarity of Lithium Phthalocyanine Thin Film

doi:10.7503/cjcu20120431

Abstract

Abstract:

The organic optoelectronic device consisting of lithium phthalocyanine(LiPc) thin film as active layer with the structure of indium tin oxide/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)/lithium phthalocyanine/polyvinylidene fluoride/aluminum(ITO/PEDOT: PSS/LiPc/PVDF/Al) was fabricated by spin coating and vacuum deposition methods. The photocurrent polarities of the device under the irradiation of visible and infrared pulse laser were investigated, respectively. Under the irradiation of 532 nm pulse laser the photocurrent direction of the device in the external circuit is from ITO to Al, but the photocurrent polarity will reverse by the irradiation of 1064 nm pulse laser, namely, photocurrent direction is from Al to ITO in the external circuit. The absorption spectrum of LiPc thin film indicates its broad absorption in visible and infrared region and it belongs to x-form confirmed by X-ray diffraction. The ambipolar property of LiPc radical could vary with the wavelength of incident light, which induces the above phenomena. It will have potential applications in light controllable switch and infrared light detection.

Key words: Lithium phthalocyanine, Photocurrent, Polarity, Radical, Organic thin film

CLC Number:

O649

TrendMD:

LI Bo. Investigation on Photocurrent Polarity of Lithium Phthalocyanine Thin Film[J]. Chem. J. Chinese Universities, 2013, 34(2): 429.

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Investigation on Photocurrent Polarity of Lithium Phthalocyanine Thin Film

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