1. Solution-based SnGaO thin-film transistors for Zn- and In-free oxide electronic devices
- Author
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Qian Wu, Chuan Liu, Changdong Chen, Jin Wu, Minmin Li, Jiwen Zheng, Zhaogui Wang, and Bolong Huang
- Subjects
010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Band gap ,Transistor ,Oxide ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Tin oxide ,01 natural sciences ,Amorphous solid ,law.invention ,chemistry.chemical_compound ,Semiconductor ,chemistry ,Thin-film transistor ,law ,0103 physical sciences ,Optoelectronics ,Electronics ,0210 nano-technology ,business - Abstract
Oxide-based electronics call for low-cost and stable semiconductors to reduce cost and enable long-term operations. Transistors based on Sn show high field-effect mobility but generally exhibit weak stability and difficulty in solution-processed patterning. Here, we report solution-processed tin-gallium-oxide (SnGaO) thin-film transistors (TFTs) for In- and Zn-free electronics. Different from tin oxide, the amorphous SnGaO semiconductor features a wide bandgap of 4.6 eV, can be wet-etched and patterned by photolithography, and exhibits a large on-off ratio and good device stability in TFTs. The films are deposited via a sol-gel process and, in the photoelectron spectra, they exhibit typical signals of Sn4+ and Ga3+, which act as the electron provider and suppresser, respectively. By varying the elemental ratios, the average field-effect mobility could be well controlled over a wide range from 0.66 to 9.82 cm2/V s, the maximum mobility can reach 12 cm2/V s, and the on/off ratio is above 106. The devices exhibited good stability for positive and negative bias stressing as well as with illumination, probably attributed to Ga-O bonds which are stronger than the weak Zn-O bonds. The presented studies may provide useful information to understand thin-film devices based on tin oxide and gallium oxide semiconductors.
- Published
- 2018