title: Microstructure and dielectric characteristics of high-k tetragonal ZrO2 films with various thicknesses processed by sol-gel method.
abstract: High-k ZrO2/Si films were fabricated by a sol-gel method and the effects of the thickness of ZrO2 on the phase formation, interface chemical structure, and dielectric performance were studied. The 0.1 M precursor sol was prepared by using Zr acetylacetonate, coated, dried on Si substrates, and finally annealed at 500 degrees C. The thickness of ZrO2 was varied in the range from 7 to 51 nm by repeating the coating and drying sequences. The deposited ZrO2 was amorphous for the sample with a thickness of -7 nm, but tetragonal (t-) phases appeared as the thickness increased. As the thickness increased, the flat-band voltage and hysteresis width in the capacitance-voltage curves increased. The sol-gel deposited ZrO2 dielectrics showed a high k value (-33) due to the formation of the t-phase, while retaining gate leakage current levels of less than -4.0 x 10(-5) A/cm2 at 1 MV/cm.
authors: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, Korea.
authors: Soo Min
authors: SM
authors: Hwang
authors: Seung Muk
authors: SM
authors: Lee
authors: Jun Hyuk
authors: JH
authors: Choi
authors: Kyung
authors: K
authors: Park
authors: Jinho
authors: J
authors: Joo
authors: Jun Hyung
authors: JH
authors: Lim
authors: Hyoungsub
authors: H
authors: Kim