Journal
THIN SOLID FILMS
Volume 519, Issue 20, Pages 6849-6852Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.01.402
Keywords
Thin film transistors (TFTs); Amorphous oxide semiconductors (AOSs); Hafnium-zinc oxide (HZO); Hafnium-zinc-tin oxide (HZTO); Negative bias temperature instability (NBTI)
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We assessed the performance of ZnO TFTs using Si3N4 gate dielectrics after various treatments. A remarkable improvement in the transfer characteristics was obtained for the O-2 plasma treated ZnO TFT and SiO2 interlayer deposited ZnO TFT. Also, we developed amorphous hafnium-zinc-tin oxide (HZTO) thin film transistors (TFTs) and investigated the influence of hafnium (Hf) doping on the electrical characteristics of the hafnium-zinc oxide (HZO) thin film transistors. Doping with Hf can decrease the carrier concentration, which may result from a decrease of the field effect mobility, and reduce oxygen vacancy related defects in the interfacial layer. Adding tin (Sn) can suppress the growth of a crystalline phase in the HZTO films. The HZTO TFTs exhibited good electrical properties with a field effect mobility of 14.33 cm(2)/Vs, a subthreshold swing of 0.97 V/decade, and a high I-ON/OFF ratio of over 10(9). (C) 2011 Elsevier B.V. All rights reserved.
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