SEMICONDUCTOR DEVICES

A novel dual-functional MEMS sensor integrating both pressure and temperature units

Chen Tao, Zhang Zhaohua, Ren Tianling, Miao Gujin, Zhou Changjian, Lin Huiwang and Liu Litian

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Abstract: This paper proposes a novel miniature dual-functional sensor integrating both pressure and temperature sensitive units on a single chip. The device wafer of SOI is used as a pizeoresistive diaphragm which features excellent consistency in thickness. The conventional anisotropic wet etching has been abandoned, while ICP etching has been employed to etch out the reference cave to minimize the area of individual device in the way that the 57.4 ℃ slope has been eliminated. As a result, the average cost of the single chip is reduced. Two PN junctions with constant ratio of the areas of depletion regions have also been integrated on the same chip to serve as a temperature sensor, and each PN junction shows high linearity over -40 to 100℃ and low power consumption. The iron implanting process for PN junction is exactly compatible with the piezoresistor, with no additional expenditure. The pressure sensitivity is 86 mV/MPa, while temperature sensitivity is 1.43 mV/℃, both complying with the design objective.

Key words: SOI

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    Received: 18 August 2015 Revised: 25 February 2010 Online: Published: 01 July 2010

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      Chen Tao, Zhang Zhaohua, Ren Tianling, Miao Gujin, Zhou Changjian, Lin Huiwang, Liu Litian. A novel dual-functional MEMS sensor integrating both pressure and temperature units[J]. Journal of Semiconductors, 2010, 31(7): 074013. doi: 10.1088/1674-4926/31/7/074013 Chen T, Zhang Z H, Ren T L, Miao G J, Zhou C J, Lin H W, Liu L T. A novel dual-functional MEMS sensor integrating both pressure and temperature units[J]. J. Semicond., 2010, 31(7): 074013. doi: 10.1088/1674-4926/31/7/074013.Export: BibTex EndNote
      Citation:
      Chen Tao, Zhang Zhaohua, Ren Tianling, Miao Gujin, Zhou Changjian, Lin Huiwang, Liu Litian. A novel dual-functional MEMS sensor integrating both pressure and temperature units[J]. Journal of Semiconductors, 2010, 31(7): 074013. doi: 10.1088/1674-4926/31/7/074013

      Chen T, Zhang Z H, Ren T L, Miao G J, Zhou C J, Lin H W, Liu L T. A novel dual-functional MEMS sensor integrating both pressure and temperature units[J]. J. Semicond., 2010, 31(7): 074013. doi: 10.1088/1674-4926/31/7/074013.
      Export: BibTex EndNote

      A novel dual-functional MEMS sensor integrating both pressure and temperature units

      doi: 10.1088/1674-4926/31/7/074013
      • Received Date: 2015-08-18
      • Accepted Date: 2009-12-19
      • Revised Date: 2010-02-25
      • Published Date: 2010-07-05

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