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Design of a microwave system for measuring dark and photo-conductivity of semiconductors

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thesis
posted on 28.03.2022, 14:47 by Rakshita Ravi
The semiconductor industry is evolving with new emerging semiconductor materials. Researchers and engineers constantly test and analyse these new materials for their conductivity to further develop this technology. The most traditional method of testing these has been through soldering electrical contacts onto the material. However, this is time consuming. The microwave probe technique used in this thesis is robust and uses relatively easy setup to analyse the electronic properties of the samples. The semiconductor materials are simulated in a rectangular open waveguide and cavity resonator. Different samples with varying conductivity, dielectric constant and sample thickness are probed to measure microwave absorption. Real photovoltaic samples, OPV, silicon, cadmium telluride (CdTe) and gallium arsenide (GaAs) are simulated for their dark and photoconductivity by changing their doping. For dark conductivity simulations, GaAs has the highest conductivity and power absorption of 23%, and OPV has the lowest conductivity and power absorption of 1.5% for low doping. For photoconductivity simulations, the proposed cavity model worked only for low conductivity samples such as OPV, and it has the capacity to absorb a maximum power of 6%. Silicon, CdTe and GaAs were simulated in open waveguide as they were shorting the cavity due to high reflection. GaAs absorbs a maximum power of 35%, silicon absorbs 14% and CdTe absorbs 9%. These results indicate that the proposed design is suitable for probing low conductivity semiconductor materials.

History

Table of Contents

1. Introduction -- 2. Background -- 3. Semiconductor materials in open waveguide -- 4. Semiconductor materials in a cavity -- 5. Photoconductivity -- 6. Summary and future work -- 7. Abbreviations -- Appendix -- Bibliography.

Notes

Empirical thesis. Bibliography: page 103

Awarding Institution

Macquarie University

Degree Type

Thesis bachelor honours

Degree

BSc (Hons), Macquarie University, Faculty of Science and Engineering, School of Engineering

Department, Centre or School

School of Engineering

Year of Award

2017

Principal Supervisor

Nikos Kopidakis

Rights

Copyright Rakshita Ravi 2017. Copyright disclaimer: http://mq.edu.au/library/copyright

Language

English

Extent

1 online resource (xiii, 103 pages colour illustrations)

Former Identifiers

mq:70426 http://hdl.handle.net/1959.14/1263633

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