P-n heterojunction and Schottky barrier formation between poly(3-methylthiophene) and n-type cadmium sulfide

Arthur Jesse Frank; Spyridon Glenis

doi:10.1117/12.45113

1 March 1991 P-n heterojunction and Schottky barrier formation between poly(3-methylthiophene) and n-type cadmium sulfide

Arthur Jesse Frank, Spyridon Glenis

Author Affiliations +

Proceedings Volume 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films; (1991) https://doi.org/10.1117/12.45113
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

The electrical and optical properties of the junction between undoped semiconductor-like or highly doped metallic-like films of PMeT [PMeT equals poly(3-methylthiophene)] and n-CdS are described. The junctions were prepared by photoelectrochemical deposition of the polymer onto the semiconductor surface from a solution of the monomer. Dark J-V measurements of the PMeT(undoped):n-CdS contact indicate rectifying behavior characteristic of a p-n junction diode, thus confirming that the undoped polymer is p-type. The photocurrent- photovoltage characteristics of the heterojunction under illumination appear stable, showing little sign of deterioration over a five-day period of observation. The presence of charge recombination centers at the p-PMeT:n-CdS interface and in the bulk is indicated. The photoresponse spectrum of the cell suggests that the observed photocurrent is due to both the polymer and n-CdS. The dark J-V characteristics of the PMeT(doped):n-CdS junction also signify a rectifying barrier. The rectification ratio of the junction is typical of a good metal- semiconductor contact. The electrical and photovoltaic properties of the doped polymer-based cell compare favorably with those of metal:n-CdS Schottky barrier devices. The parameters of the hybrid organic-inorganic heterojunction are compared with those of the Schottky barrier.

Citation Download Citation

Arthur Jesse Frank and Spyridon Glenis "P-n heterojunction and Schottky barrier formation between poly(3-methylthiophene) and n-type cadmium sulfide", Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); https://doi.org/10.1117/12.45113

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