Atomic-layer-deposited zinc oxide as tunable uncooled infrared microbolometer material

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Date

2014-11-01

Author

Battal, Enes
Bolat, Sami
TANRIKULU, MAHMUD YUSUF
OKYAY, Ali Kemal
Akın, Tayfun

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ZnO is an attractive material for both electrical and optical applications due to its wide bandgap of 3.37eV and tunable electrical properties. Here, we investigate the application potential of atomic-layer-deposited ZnO in uncooled microbolometers. The temperature coefficient of resistance is observed to be as high as -10.4%K-1 near room temperature with the ZnO thin film grown at 120 degrees C. Spectral noise characteristics of thin films grown at various temperatures are also investigated and show that the 120 degrees C grown ZnO has a corner frequency of 2kHz. With its high TCR value and low electrical noise, atomic-layer-deposited (ALD) ZnO at 120 degrees C is shown to possess a great potential to be used as the active layer of uncooled microbolometers. The optical properties of the ALD-grown ZnO films in the infrared region are demonstrated to be tunable with growth temperature from near transparent to a strong absorber. We also show that ALD-grown ZnO can outperform commercially standard absorber materials and appears promising as a new structural material for microbolometer-based applications.

Subject Keywords

Atomic layer deposition, Bolometers, Electrical conduction, Semiconductors, Thin films, ZnO

URI

https://hdl.handle.net/11511/33257

Journal

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE

DOI

https://doi.org/10.1002/pssa.201431195

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

E. Battal, S. Bolat, M. Y. TANRIKULU, A. K. OKYAY, and T. Akın, “Atomic-layer-deposited zinc oxide as tunable uncooled infrared microbolometer material,” PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, pp. 2475–2482, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33257.