Effect of electric field and doping on photovoltaic properties of α-bromine-terthiophene thin film

The photovoltaic properties of alpha -bromine-terthiophene thin film were investigated by means of surface photovoltage spectroscopy and field-induced surface photovoltage spectroscopy. The surface photovoltaic (SPV) response intensity of the pi arrow right pi * transition band (300-430 nm) was enha...

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Bibliographic Details
Published in:Thin solid films 2001-08, Vol.394 (1-2), p.207-212
Main Authors: XIE, T. F, WANG, D. J, YANG, W. S, ZHANG, Y. H, XU, J. J, ZHU, L. J, LI, T. J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface conductivity and carrier phenomena
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Summary:The photovoltaic properties of alpha -bromine-terthiophene thin film were investigated by means of surface photovoltage spectroscopy and field-induced surface photovoltage spectroscopy. The surface photovoltaic (SPV) response intensity of the pi arrow right pi * transition band (300-430 nm) was enhanced when a positive electric field was applied and it was weakened when a negative electric field was applied. Interestingly, three new photovoltaic response bands were observed in the visible and near-IR region (430-1200 nm) under an external electric field. After the film was doped with iodine vapor, the three photovoltaic response bands can be observed without an external electric field being applied. According to the principle of FISPS and phase technique, the three bands can be explained by the charge-resonance of the dimer radical cations in the doped film. copyright 2001 Elsevier Science B.V. All right reserved.
ISSN:0040-6090
1879-2731