We investigate thin-film transistor (TFT) fabrication, using a novel amorphous boron-indium-zinc-oxide (a-BIZO) thin-film as an active channel layer and a radio-frequency sputtering technique. The structural, surface, and optical properties of the a-BIZO thin-film were studied. X-ray diffraction (XRD) patterns and high-resolution transmission electron microscopy (HR-TEM) analysis confirmed the amorphous nature of the a-BIZO thin-film. Atomic force microscopy revealed a smooth a-BIZO thin-film surface with a uniform and root mean square roughness of 0.45 nm. The transparency of a-BIZO thin-films was shown to be more than 80% in the wavelength range between 400 and 800 nm, which confirmed a good transparency. The a-BIZO TFT post-annealed at 250 °C under nitrogen atmospheric conditions showed a saturation field-effect mobility of 9.6 cm2 V-1 s-1, a threshold voltage of 5.3 V, and a subthreshold swing of 0.77 V per dec with an ION/IOFF current ratio of 2.5 × 107. The small amount of boron dopant acts as a strong carrier suppressor via the formation of oxygen vacancies in the a-IZO matrix.
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© The Royal Society of Chemistry 2015.
All Science Journal Classification (ASJC) codes
- Materials Chemistry