Flexible High-Entropy Poly(vinyl alcohol) Dielectric Films Were Prepared at a Low Temperature and Applied to an Indium Gallium Zinc Oxide Thin-Film Transistor

Zhihao Liang; Weijing Wu; Xiao Fu; Honglong Ning; Wei Xu; Xin Xiong; Tian Qiu; Cheng Luo; Rihui Yao; Junbiao Peng

doi:10.1021/acs.jpclett.3c02462

Flexible High-Entropy Poly(vinyl alcohol) Dielectric Films Were Prepared at a Low Temperature and Applied to an Indium Gallium Zinc Oxide Thin-Film Transistor

J Phys Chem Lett. 2023 Oct 19;14(41):9245-9249. doi: 10.1021/acs.jpclett.3c02462. Epub 2023 Oct 9.

Authors

Zhihao Liang¹, Weijing Wu¹, Xiao Fu¹, Honglong Ning¹, Wei Xu¹, Xin Xiong¹, Tian Qiu², Cheng Luo³, Rihui Yao¹, Junbiao Peng¹

Affiliations

¹ Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China.
² Department of Intelligent Manufacturing, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China.
³ School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan, Hubei 442002, People's Republic of China.

PMID: 37812073
DOI: 10.1021/acs.jpclett.3c02462

Abstract

In recent years, more and more attention has been paid to flexible thin-film transistors (TFTs). Therefore, we combined HfMgTiYZrO_x high-entropy metal oxide and poly(vinyl alcohol) (PVA) organic material to prepare a flexible dielectric layer. We fabricated metal-insulator-metal (MIM) and TFT devices and carried out flexible tests. The test results show that the mixed dielectric layer attains a leakage current of 3.6 × 10^-11 A under the bending radius of 5 mm. In the application of the TFT, the device still has good performance after 10 000 bends with a mobility of 3.1 cm² V^-1 s^-1, an I_on/I_off of 1.4 × 10⁷, a threshold voltage of 3.3 V, and a threshold swing of 0.20 V/decade. In addition, the average transmittance of the hybrid dielectric layer in the visible range is 90.8%. Therefore, high-entropy PVA hybrid films have high transparency, low leakage current, and good bending resistance and have broad application prospects in transparent and flexible devices.