Biocompatible/Degradable Silk Fibroin:Poly(Vinyl Alcohol)-Blended Dielectric Layer Towards High-Performance Organic Field-Effect Transistor

Xinming Zhuang; Wei Huang; Xin Yang; Shijiao Han; Lu Li; Junsheng Yu

doi:10.1186/s11671-016-1660-x

Biocompatible/Degradable Silk Fibroin:Poly(Vinyl Alcohol)-Blended Dielectric Layer Towards High-Performance Organic Field-Effect Transistor

Nanoscale Res Lett. 2016 Dec;11(1):439. doi: 10.1186/s11671-016-1660-x. Epub 2016 Oct 1.

Authors

Xinming Zhuang¹, Wei Huang^{1

2}, Xin Yang³, Shijiao Han¹, Lu Li⁴, Junsheng Yu^{5

6}

Affiliations

¹ State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China.
² Department of Chemistry and the Materials Research Center Northwestern University, 2145, Sheridan Road, Evanston, IL, 60208, USA.
³ Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Research Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing, 402160, China.
⁴ Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Research Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing, 402160, China. lli@cqwu.edu.cn.
⁵ State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, China. jsyu@uestc.edu.cn.
⁶ Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Research Institute for New Materials and Technology, Chongqing University of Arts and Sciences, Chongqing, 402160, China. jsyu@uestc.edu.cn.

Abstract

Biocompatible silk fibroin (SF):poly(vinyl alcohol) (PVA) blends were prepared as the dielectric layers of organic field-effect transistors (OFETs). Compared with those with pure SF dielectric layer, an optimal threshold voltage of ~0 V, high on/off ratio of ~10⁴, and enhanced field-effect mobility of 0.22 cm²/Vs of OFETs were obtained by carefully controlling the weight ratio of SF:PVA blends to 7:5. Through the morphology characterization of dielectrics and organic semiconductors by utilizing atom force microscopy and electrical characterization of the devices, the performance improvement of OFETs with SF:PVA hybrid gate dielectric layers were attributed to the smooth and homogeneous morphology of blend dielectrics. Furthermore, due to lower charge carrier trap density, the OFETs based on SF:PVA-blended dielectric exhibited a higher bias stability than those based on pure SF dielectric.

Keywords: Bias stability; Biocompatible; Organic field-effect transistor; Poly(vinyl alcohol); Silk fibroin.