Electrical charge transport and optical properties of iron pyrite

Iron pyrite is among the promising solar materials owing to its remarkably high optical absorption, optimal band gap, abundance, and non-toxicity. However, its solar conversion efficiency is limited to about 3 % mainly due to its low photovoltage. To address that, thin films prepared by spray pyr...

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Main Author: Shukla, Sudhanshu
Other Authors: Thirumany Sritharan
Format: Thesis-Doctor of Philosophy
Language:English
Published: Nanyang Technological University 2017
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Online Access:http://hdl.handle.net/10356/70587
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-705872020-11-01T05:02:51Z Electrical charge transport and optical properties of iron pyrite Shukla, Sudhanshu Thirumany Sritharan DRNTU::Engineering::Materials Iron pyrite is among the promising solar materials owing to its remarkably high optical absorption, optimal band gap, abundance, and non-toxicity. However, its solar conversion efficiency is limited to about 3 % mainly due to its low photovoltage. To address that, thin films prepared by spray pyrolysis, spin-coating of hot-injection synthesized nanocubes and pulsed laser deposition were sulfurized to obtain the pure pyrite phase. The film showed similar electrical properties and degenerate semiconducting behavior with Mott-VRH charge transport over a wide temperature range. Charge carrier dynamics in nanocube thin film revealed fast carrier localization and long-lived trap states in the pure pyrite. Temperature dependent electrical and magnetic behaviors supported the existence of intrinsic localized gap states. A non-standard, electrical experiment was carried out on a natural pyrite single crystal to assess the surface and bulk resistivities of pyrite which showed a significant difference in them for temperatures less than 120 K. It is concluded that the poor photovoltage generated by pyrite solar devices is due to the intrinsic defects in the material rather than to impurities or secondary phases. Doctor of Philosophy (IGS) 2017-05-02T08:27:46Z 2017-05-02T08:27:46Z 2017 Thesis-Doctor of Philosophy Shukla, S. (2018). Electrical charge transport and optical properties of iron pyrite. Doctoral thesis, Nanyang Technological University, Singapore. http://hdl.handle.net/10356/70587 10.32657/10356/70587 en 226 p. application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Shukla, Sudhanshu
Electrical charge transport and optical properties of iron pyrite
description Iron pyrite is among the promising solar materials owing to its remarkably high optical absorption, optimal band gap, abundance, and non-toxicity. However, its solar conversion efficiency is limited to about 3 % mainly due to its low photovoltage. To address that, thin films prepared by spray pyrolysis, spin-coating of hot-injection synthesized nanocubes and pulsed laser deposition were sulfurized to obtain the pure pyrite phase. The film showed similar electrical properties and degenerate semiconducting behavior with Mott-VRH charge transport over a wide temperature range. Charge carrier dynamics in nanocube thin film revealed fast carrier localization and long-lived trap states in the pure pyrite. Temperature dependent electrical and magnetic behaviors supported the existence of intrinsic localized gap states. A non-standard, electrical experiment was carried out on a natural pyrite single crystal to assess the surface and bulk resistivities of pyrite which showed a significant difference in them for temperatures less than 120 K. It is concluded that the poor photovoltage generated by pyrite solar devices is due to the intrinsic defects in the material rather than to impurities or secondary phases.
author2 Thirumany Sritharan
author_facet Thirumany Sritharan
Shukla, Sudhanshu
format Thesis-Doctor of Philosophy
author Shukla, Sudhanshu
author_sort Shukla, Sudhanshu
title Electrical charge transport and optical properties of iron pyrite
title_short Electrical charge transport and optical properties of iron pyrite
title_full Electrical charge transport and optical properties of iron pyrite
title_fullStr Electrical charge transport and optical properties of iron pyrite
title_full_unstemmed Electrical charge transport and optical properties of iron pyrite
title_sort electrical charge transport and optical properties of iron pyrite
publisher Nanyang Technological University
publishDate 2017
url http://hdl.handle.net/10356/70587
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