Transient photoconductivity and light-activated p-n junction device based on bilayer-substituted polythiophene derivatives

Yaron Greenwald; Jorge M. Poplawski; Eitan A. Ehrenfreund; Shammai Speiser

doi:10.1117/12.251818

30 September 1996 Transient photoconductivity and light-activated p-n junction device based on bilayer-substituted polythiophene derivatives

Yaron Greenwald, Jorge M. Poplawski, Eitan A. Ehrenfreund, Shammai Speiser

Author Affiliations +

Proceedings Volume 2851, Photopolymer Device Physics, Chemistry, and Applications III; (1996) https://doi.org/10.1117/12.251818
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We have studied acceptor substituted poly(3-butyl)thiophene in an attempt to examine the role of acceptor molecules as intrinsic charge traps under light excitations by measuring the transient photoconductivity response following pulse excitation. The specially synthesized acceptor molecule is a chemically prepared high electron affinity (HEA) monomer, 1- (4-nitrophenyl)-2-(3-thienyl) ethene. In the co-polymers prepared with this acceptor monomer we have observed a simultaneous decrease of the sub-nanosecond photoconductivity and increase of the slow component is attributed to a bimolecular recombination process. A new photoinduced current rectifier based on an all-organic donor-acceptor bilayer substituted polythiophene derivative is described. Under visible and UV illumination, a p-n junction is formed leading to current rectification. Maximum photo-rectified current is obtained at approximately 400 nm, with a sharp decrease at shorter wavelengths. This sharp decrease indicates that photons with energy higher than 3.1 eV quench the light activation of this bilayer device.

Citation Download Citation

Yaron Greenwald, Jorge M. Poplawski, Eitan A. Ehrenfreund, and Shammai Speiser "Transient photoconductivity and light-activated p-n junction device based on bilayer-substituted polythiophene derivatives", Proc. SPIE 2851, Photopolymer Device Physics, Chemistry, and Applications III, (30 September 1996); https://doi.org/10.1117/12.251818

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