Photovoltaic Polarity Inversion in Thin Filma of Titanoxophthalocyanine/N,N-Bistolylperylene Tetracarboxylic Dimimide Composite Films

Chem. J. Chinese Universities ›› 2006, Vol. 27 ›› Issue (2): 323.

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Photovoltaic Polarity Inversion in Thin Filma of Titanoxophthalocyanine/N,N-Bistolylperylene Tetracarboxylic Dimimide Composite Films

SUN Jing-Zhi, CAO Jian, XU Hai-Feng, HONG Huang

Department of Polymer Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China

Received:2005-01-19 Online:2006-02-10 Published:2006-02-10
Contact: SUN Jing-Zhi,E-mail:oplsunjz@zju.edu.cn

Abstract

Abstract:

Surface photovoltaic behavior of titanoxophthalocyanine(TiOPc)/N,N-bistolylperylene tetracarboxylic diimide(ToPTCDI) composite films was investigated with surface photovoltaic spectroscopy(SPS) and field induced surface photovoltaic spectroscopy(FISPS). It was found that the introduction of ToPTCDI into TiOPC could result in negative SPS response both in visible and in near-infrared spectral regions, which was assigned to the phenomenon of photovoltaic polarity inversion. The polarity of the SPS signals could be tuned by external bias, showing the characteristic of surface electronic states. Based on the n\|type nature of ToPTCDI, the energy space between the optical transitions from valence band to surface state and from surface state to conduction band, as well the bias-direction dependent FISPS signals, the origin of the surface electronic state was ascribed to ToPTCDI component.

Key words: 光伏极性反转; 表面态; 复合材料; 表面光电压

CLC Number:

O643

TrendMD:

SUN Jing-Zhi, CAO Jian, XU Hai-Feng, HONG Huang. Photovoltaic Polarity Inversion in Thin Filma of Titanoxophthalocyanine/N,N-Bistolylperylene Tetracarboxylic Dimimide Composite Films[J]. Chem. J. Chinese Universities, 2006, 27(2): 323.

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Photovoltaic Polarity Inversion in Thin Filma of Titanoxophthalocyanine/N,N-Bistolylperylene Tetracarboxylic Dimimide Composite Films

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