Title

Photo-Emf Effect In Polydiacetylene Pts

Keywords

Organic crystals; Photo-emf; Photoconductivity; Polydiacetylene; Quantum wire

Abstract

In this work we report for the first time observation of AC photocurrents generated by photo-emf effect in high quality crystals of the conjugated polymer 2,4-hexadiyne-1,6-diol-bis-(para-toluene sulfonate) or polydiacetylene PTS (usually referred simply as PTS). We used illumination at λ=633nm where the absorption spectra has its peak. In principle, photocurrent at this wavelength should be small due to the large exciton binding energy, however we show that relative large photocurrents can be observed at modest electric fields (up 2000 V/cm). When the sample is illuminated with a periodically oscillating interference pattern it leads to spatial redistribution of charge carriers among traps. Spatial overlap of the resulting space-charge field with the oscillating photoconductivity pattern gives rise to an oscillating photocurrent (photo-emf signal). From photo-emf measurements, a Maxwell relaxation time of 0.17 sec at 6 W/cm2 and lifetime of carriers of 6 ms were estimated. The later was confirmed from photoconductivity measurements.

Publication Date

12-1-2002

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

4802

Number of Pages

130-137

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.452441

Socpus ID

0036983669 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0036983669

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