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Proceedings Paper

Uncooled microbolometer infrared focal plane array in standard CMOS
Author(s): Deniz Sabuncuoglu Tezcan; Selim Eminoglu; Orhan Sevket Akar; Tayfun Akin
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Paper Abstract

This paper reports implementation of a low-cost microbolometer focal plane array using n-well layer in a CMOS process as the microbolometer material. N-well microbolometer structures are suspended for thermal isolation by post-etching of fabricated CMOS dies using silicon bulk-micromachining techniques. Although n-well has a moderate TCR of 0.5-0.65%/K at 300K, it still provides a reasonable performance due to its single crystal structure which contributes low 1/f noise. Detailed thermal simulations in ANSYS were performed to obtain an optimized structure. Various prototype FPAs with 16x16 array sizes have been implemented with 80 mm x 80 mm and 50 mm x 50 mm pixel sizes. The measurements and calculations show that the n-well microbolometers can provide a responsivity of 8.5 x 106 V/W, a detectivity of 5.5 x 109 cmHz1/2/W, and an NETD of 260 mK at 30 frames per second using a simple, fully-serial readout approach with an integrator output. The performance of the array can be increased with advanced readout techniques and improved pixel structures. The CMOS n-well microbolometer approach seems very cost-effective to produce large focal plane arrays for uncooled infrared imaging with reasonable performance.

Paper Details

Date Published: 12 June 2001
PDF: 10 pages
Proc. SPIE 4288, Photodetectors: Materials and Devices VI, (12 June 2001); doi: 10.1117/12.429399
Show Author Affiliations
Deniz Sabuncuoglu Tezcan, Middle East Technical Univ. (Turkey)
Selim Eminoglu, Middle East Technical Univ. (Turkey)
Orhan Sevket Akar, Middle East Technical Univ. (Turkey)
Tayfun Akin, Middle East Technical Univ. (Turkey)

Published in SPIE Proceedings Vol. 4288:
Photodetectors: Materials and Devices VI
Gail J. Brown; Manijeh Razeghi, Editor(s)

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