A Detailed Analysis for the Absorption Coefficient of Multilevel Uncooled Infrared Detectors

Date

2011-04-29

Author

Küçük, Serhat
Akın, Tayfun

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

252
views

0
downloads

This paper introduces a detailed analysis on the calculation of the absorption coefficient of multilevel uncooled infrared detectors. The analysis is carried out considering a two-level 25 mu m pixel pitch infrared detector with a sandwich type resistor which is divided into sub-regions consisting of different stacks of layers. The absorption coefficients of these different sub-regions are calculated individually by using the cascaded transmission line model, including the main body, arms, and the regions where the resistors are implemented. Then, the total absorption coefficient of the detector is found by calculating the weighted average of these individual absorption coefficients, where the areas of sub-regions are taken into account. The absorption can be calculated as a function of the sacrificial and structural layer thicknesses together with the sheet resistance of the absorber layer to find the optimum value. However, the thermal conductance of the detector must be considered while adjusting the structural layer thickness. The proposed analysis also takes the thermal conductance into account in order not to compromise the overall detector performance. Analysis shows that a maximum absorption coefficient of 0.92 for a specific two-level pixel can be obtained at the 10 mu m wavelength, while the pixel results in a time constant of 11.3 ms with 27.2 nW/K thermal conductance in the thermal simulation. It is shown that the absorption coefficient of the pixel is maximized when the sheet resistance of the absorber is 380 Omega/square, which is almost equal to the free space impedance, as expected.

Subject Keywords

Absorption coefficient, Cascaded transmission line model, Uncooled ınfrared detectors, Microbolometer

URI

https://hdl.handle.net/11511/34341

DOI

https://doi.org/10.1117/12.890236

Collections

Department of Petroleum and Natural Gas Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A new method to estimate the absorption coefficient for uncooled infrared detectors Tanrikulu, M. Yusuf; Civitci, Fehmi; Akın, Tayfun (2008-03-20) his paper introduces a new method to estimate the total absorption coefficient of uncooled infrared detectors. Current approaches in the literature model the infrared detectors as cascaded transmission lines representing the detector layers, and this model can easily be used to estimate the absorption coefficient if the detector has the same structure at every point. However, the state of the art uncooled infrared detectors do not have same structure at every point, making it not feasible to use this simple...
A New Method for Leakage Inductance Calculation of Transverse Flux Machines Zafarani, Mohsen; Moallem, Mehdi; Ghadamyari, Mohammad Adib (2011-09-10) This paper presents a new analytical method for leakage inductance calculation of transverse flux permanent magnet machines. In this method, leakage flux paths are predicted base on the finite element results, and then all paths would be modeled by flux tubes. Finally, the inductance of the machine would be obtained by calculation of the permeance of flux tubes. The validity of the proposed model is verified by comparing the Finite Element results with the results obtained from the proposed approach. Compar...
A Thermal Conductance Optimization and Measurement Approach for Uncooled Microbolometers Senveli, S. Ufuk; Tanrikulu, M. Yusuf; Akın, Tayfun (2011-04-29) This paper introduces an optimization approach of thermal conductance for single level uncooled microbolometer detectors. An efficient detector design is required due to the limited availability of silicon area per pixel, i.e., the pixel pitch, and due to the capabilities of the fabrication line. The trade-offs between physical parameters are studied to attain the best performance, including the thermal conductance, the thermal time constant, the effective temperature coefficient of resistance (TCR), and th...
Two-Dimensional Numerical Analysis of Phosphorus Diffused Emitters on Black Silicon Surfaces TÜRKAY, Deniz; Yerci, Selçuk (2018-07-06) In this work, we present an analysis on electrical performance of phosphorus diffused emitters on black silicon surfaces through two-dimensional simulations. In particular, we focus on the extraction and analysis of the emitter saturation current density (J(0e)), the sheet resistance (R-sh), spatial collection efficiency profile and relatedly J(sc) of a solar cell. Using process simulations, we form emitters on periodic triangular structures with various aspect ratios (R) and emitter profiles. We show that ...
A theoretical study of chemical doping and width effect on zigzag graphene nanoribbons Pekoz, Rengin; Erkoç, Şakir (Elsevier BV, 2009-12-01) The energetics and the electronic properties of nitrogen- and boron-doped graphene nanoribbons with zigzag edges have been investigated using density functional theory calculations. For the optimized geometry configurations, vibrational frequency analysis and wavefunction stability tests have been carried out. Different doping site optimizations for a model nanoribbon have been performed and formation energy values of these sites revealed that zigzag edgesite for both of the dopants were the most favorable ...

Citation Formats

S. Küçük and T. Akın, “A Detailed Analysis for the Absorption Coefficient of Multilevel Uncooled Infrared Detectors,” 2011, vol. 8012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34341.