title: Nanocomposite approaches for enhancing the DC and photoconductivity of DNA films.
abstract: Enhanced DC conductivity and photoconductivity of cationic carbazole tethered deoxyribonucleic acid (Cz-DNA) in film devices is achieved by incorporating mobility enhancers. An anthracene-based organic semiconductor (namely 4HPA-Ant) and the inorganic semiconductor cadmium sulfide (CdS) multipod nanocrystal (NC) were used as the mobility enhancers. Space charge limited current (SCLC) experiments show that hole mobility in CdS:Cz-DNA composite film is improved significantly, by about an order of magnitude, compared to the Cz-DNA film. Similarly, the DC conductivity of the composite film is slightly enhanced by 4HPA-Ant. The photoconductivity is also improved in the Cz-DNA composite, with both 4HPA-Ant and CdS multipod NCs. The enhancement in photocurrent is by more than an order of magnitude, as demonstrated by current-voltage (I-V) characterization using DNA composite photodetectors.
authors.affiliation: Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
authors.forename: Won Jin
authors.initials: WJ
authors.lastname: Kim
authors.forename: Min Ju
authors.initials: MJ
authors.lastname: Cho
authors.forename: Jangwon
authors.initials: J
authors.lastname: Seo
authors.forename: Carrie M
authors.initials: CM
authors.lastname: Bartsch
authors.forename: James
authors.initials: J
authors.lastname: Grote
authors.forename: Paras N
authors.initials: PN
authors.lastname: Prasad
mesh_terms: D000873:Anthracenes; D019187:Cadmium Compounds; D002227:Carbazoles; D004247:DNA / Q000737:chemistry; D004553:Electric Conductivity; D008027:Light; D053761:Nanocomposites / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D012666:Semiconductors; D013440:Sulfides
chemical_list: D000873:Anthracenes; D019187:Cadmium Compounds; D002227:Carbazoles; D013440:Sulfides; C034939:cadmium sulfide; C041514:carbazole; D004247:DNA; C034020:anthracene