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Transparent Electronics Using One Binary Oxide for All Transistor Layers
Author(s) -
Alshammari Fwzah H.,
Hota Mrinal K.,
Alshareef Husam N.
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201803969
Subject(s) - materials science , transistor , optoelectronics , thin film transistor , threshold voltage , flexible electronics , atomic layer deposition , gate dielectric , layer (electronics) , nanotechnology , voltage , electrical engineering , engineering
A novel process is developed in which thin film transistors (TFTs) comprising one binary oxide for all transistor layers (gate, source/drain, semiconductor channel, and dielectric) are fabricated in a single deposition system at low temperature. By simply changing the flow ratio of two chemical precursors, C 8 H 24 HfN 4 and (C 2 H 5 ) 2 Zn, in an atomic layer deposition system, the electronic properties of the binary oxide (Hf x Zn 1− x O 2− δ or HZO) are tuned from conducting, to semiconducting, to insulating. Furthermore, by carefully optimizing the properties of the various transistor HZO layers, all‐HZO thin film transistors are achieved with excellent performance on both glass and plastic substrates. Specifically, the optimized all‐HZO TFTs show a saturation mobility of ≈17.9 cm 2 V −1 s −1 , low subthreshold swing of ≈480 mV dec −1 , high I on / I off ratio of >10 9 , and excellent gate bias stability at elevated temperatures. In addition, all‐HZO inverters with high DC voltage gain (≈470), and all‐HZO ring oscillators with low stage delay (≈408 ns) and high oscillation frequency of 245 kHz are demonstrated. This approach presents a novel, simple, high performance, and cost‐effective process for the fabrication of indium‐free transparent electronics.