Effects of Thickness Effect and Rapid Thermal Annealing on pH Sensing Characteristics of Thin HfO2 Films Formed by Atomic Layer Deposition

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概要

• 論文の詳細を見る

• In this article, thin hafnium oxide (HfO2) films deposited by atomic layer deposition (ALD) were investigated as a sensing layer on an electrolyte--insulator--semiconductor (EIS) structure for pH sensor applications. Compared with sputtering, ALD provides the possibility of shrinking the thickness of the HfO2 sensing layer down to 3.5 nm with a low drift coefficient ({<}0.2 mV/h). To increase the pH response, an additional rapid thermal annealing was performed on a 3.5-nm-thick ALD-HfO2 film. After annealing at 900 °C, the pH sensitivity could be effectively increased to that near the Nernstian response (59.6 mV/pH), and the drift coefficient ({<}1 mV/h) and hysteresis width (4.26 mV) are still sufficient. On the basis of the results of atomic force microscopy (AFM) analysis, the increase in surface roughness is possibly the reason for the increase in pH response after annealing. For compatibility with advanced complementary metal--oxide--semiconductor (CMOS) technology, the thin ALD-HfO2 film is a promising candidate for pH sensor fabrications.

• 2011-10-25

著者

• Lai Chao-sung

  Department Of Electronic Engineering Chang Gung University

• Lu Tseng-fu

  Department Of Electronic Engineering Chang Gung University

• Wang Jer-chyi

  Department Of Electronic Engineering Chang Gung University

• Lai Chao-Sung

  Department of Electronic Engineering, Chang Gung University, Kweishan, Taoyuan 333, Taiwan

• Chuang Hao-Chun

  Department of Electronic Engineering, Chang Gung University, Kweishan, Taoyuan 333, Taiwan

• Yang Chia-Ming

  Inotera Memories, Inc., Kweishan, Taoyuan 333, Taiwan

• Kuo Pei-Chun

  Department of Electronic Engineering, Chang Gung University, Kweishan, Taoyuan 333, Taiwan

• Lu Tseng-Fu

  Department of Electronic Engineering, Chang Gung University, Kweishan, Taoyuan 333, Taiwan

• Yang Chia-Ming

  Inotera Memories, Inc., 667 Fu-Hsing 3rd Road, Hwa-Ya Technology Park, Kweishan 333, Taoyuan, Taiwan

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