Laser-Induced Intrinsic and Dye-Sensitized Photoconductivity in β-Carotene Glass

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Photoconductivity is studied in thin films of β-carotene glass, an amorphous mixture of β-carotene isomers. Photocurrents are produced by a pulsed dye laser and are on the order of microamperes. The mechanism for production of photocurrent is believed to be two-photon internal photoemission. Photoconduction is also investigated in a variety of organic dyes. These dyes and chlorophyll a are then used to sensitize the photoconduction of β-carotene glass to longer wavelengths than it would normally photoconduct. It is believed that chlorophyll and phthalocyanine donate holes to the carotene after photoexcitation, while the other dyes undergo an energy transfer process. The voltage, laser intensity, and wavelength dependences of the photocurrents are examined and compared with results from earlier studies.

Keywords: Laser-induced photoprocesses; Photoconductivity; Spectral sensitization; β-carotene

Document Type: Research Article


Affiliations: Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109

Publication date: August 1, 1988

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