Institute for Lasers, Photonics and Biophotonics, Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
Nanotechnology. 2013 Aug 23;24(33):335203. doi: 10.1088/0957-4484/24/33/335203. Epub 2013 Jul 29.
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.
通过引入载流子迁移率增强剂，实现了阳离子咔唑连接的脱氧核糖核酸（Cz-DNA）在薄膜器件中增强的直流电导率和光电导性能。使用基于蒽的有机半导体（即 4HPA-Ant）和无机半导体硫化镉（CdS）多足纳米晶体（NC）作为载流子迁移率增强剂。空间电荷限制电流（SCLC）实验表明，与 Cz-DNA 薄膜相比，CdS:Cz-DNA 复合膜中的空穴迁移率显著提高，约提高一个数量级。同样，4HPA-Ant 略微增强了复合膜的直流电导率。在 Cz-DNA 复合材料中，4HPA-Ant 和 CdS 多足 NC 都提高了光电导性能。通过使用 DNA 复合光电探测器进行电流-电压（I-V）特性分析，证明了光电流的增强超过一个数量级。
