Studies of Charge Transport in DNA Films Using the Time-of-Flight (TOF) Technique (Postprint)
2011
Ouchen, Fahima | Grote, James G | Yaney, Perry P | Gorman, Timothy
Prepared in collaboration with Department of Physics, University of Dayton, OH. Proc. of SPIE Vol. 8103 81030H-7
Show more [+] Less [-]Measurements were carried out on salmon DNA-based films, including as-received DNA (molecular weight, MW2000 kDa) without and with hexacetyltrimethl-ammonium chloride (CTMA) surfactant, and sonicated DNA of MW200 kDa with CTMA. The test specimens were spin-coated or drop-cast films on ITO-coated quartz slides with a gold charge-collecting electrode. To protect the films from atmospheric influences, the TOF devices were coated with a 200-400 nm polyurethane passivation layer. A quadrupled 20 ns, pulsed Nd:YAG laser with output at 266 nm was used for charge injection. The room temperature photoconductive transients were dispersive to varying degrees with hole mobilities in DNA materials films ranging between 2E-5 to 6E-3 cm2/Vs for fields ranging from 8 to 58 kV/cm. Only hole response was observed in DNA. The dispersive data were analyzed using a simple, quasi-empirical equation for the photocurrent transient data.
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