Bias stress stable aqueous solution derived Y-doped ZnO thin film transistors?

Journal of Materials Chemistry Pub Date: 2011-08-12 DOI: 10.1039/C1JM11586C

Abstract

We demonstrate solution processed oxide semiconductor thin-film transistors (TFTs) with high performance as well as improved electrical/thermal temperature stress stabilities. Yttrium-doped ZnO (YZO) TFTs are fabricated using aqueous precursors prepared via direct dissolution of metal hydroxides. The Y contents in YZO films are critical for determining the intrinsic electrical properties as well as the positive bias stress-, negative bias stress-, and negative bias temperature stress-induced instabilities. Solution processed 1% Y-doped ZnO TFT annealed at 350 °C exhibits a noticeably lower threshold voltage shift of 3.78 V under positive bias stress and ?1.72 V under negative bias temperature stress as well as the good device performance with a mobility of ～1.8 cm2 V?1 s?1 and an on/off current ratio of ～107. Our results suggest that solution processed Y-doped ZnO TFTs have potential for use in high stability performance applications in transparent devices.

Graphical abstract: Bias stress stable aqueous solution derived Y-doped ZnO thin film transistors
Recommended Literature