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Probing the charge generation and recombination in thin-film, optoelectronic devices / STEFAN ZEISKE

Swansea University Author: STEFAN ZEISKE

DOI (Published version): 10.23889/SUthesis.59296

Abstract

Sustainably and environment-friendly manufactured semiconductors are at-tractive candidates for next generation electronic and optoelectronic appli-cations ranging from memory storage and computation, to power manage-ment and energy generation. In this regard, organic semiconductors, i.e., semicondu...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Meredith, Paul ; Armin, Ardalan
URI: https://cronfa.swan.ac.uk/Record/cronfa59296
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spelling 2022-02-02T13:52:04.6725385 v2 59296 2022-02-02 Probing the charge generation and recombination in thin-film, optoelectronic devices 97df283d21b8fdfcad174628827e4c0b STEFAN ZEISKE STEFAN ZEISKE true false 2022-02-02 Sustainably and environment-friendly manufactured semiconductors are at-tractive candidates for next generation electronic and optoelectronic appli-cations ranging from memory storage and computation, to power manage-ment and energy generation. In this regard, organic semiconductors, i.e., semiconductors based on conjugated carbon-based molecules and polymers derived from earth abundant elements, are the subject of intense basic re-search and technological development efforts. Understanding the funda-mental processes governing these low-mobility and disordered semiconduct-ing materials is therefore key to establish next generation applications based upon flexible and solution-processible organic semiconductors as global com-mercial technologies.The work presented in this thesis focuses on the investigation of charge generation and recombination processes on thin film optoelectronic devices based upon organic semiconductors. A suite of experimental techniques, im-proved measurement setups, and expanded approaches are presented, and form the basis of comprehensive studies on state-of-the-art, high-efficiency organic photovoltaic systems. Specifically, an external quantum efficiency measurement technique with unprecedented dynamic range will be detailed. Using this enhanced apparatus, an approach allowing one to accurately de-termine charge generation quantum yields is introduced. After this, an extended technique to probe photogenerated charge carrier densities is out-lined and applied to thin-film solar cells. Having emphasized the importance of studying charge generation, a combined theoretical and experimental ex-ploration of the light intensity dependence of photocurrent and charge col-lection efficiency under the influence of various loss mechanisms is described. These insights provide the basis of a comprehensive study on organic so-lar cells, where recombination caused by localized trap states is found to be universally present under operational conditions limiting photocurrent and power-conversion efficiency. Overall, the work presented in this thesis expands on existing techniques and approaches, and yields important new understanding as to the device physics of thin-film, optoelectronic applica-tions. E-Thesis Swansea Photovoltaic, Organic semiconductors, Solar cells, Charge generation, Recombination 2 2 2022 2022-02-02 10.23889/SUthesis.59296 COLLEGE NANME COLLEGE CODE Swansea University Meredith, Paul ; Armin, Ardalan Doctoral Ph.D EPSRC Doctoral Training Partnership studentship; Grant number: EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics 2022-02-02T13:52:04.6725385 2022-02-02T13:19:26.7964163 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics STEFAN ZEISKE 1 59296__22288__82ea87d1a6f3497490b2cc4aa54eaaa3.pdf Zeiske_Stefan_PhD_Thesis_Redacted_Signature.pdf 2022-02-02T13:34:47.3266387 Output 9309088 application/pdf E-Thesis – open access true Copyright: The author, Stefan Zeiske, 2022. true eng
title Probing the charge generation and recombination in thin-film, optoelectronic devices
spellingShingle Probing the charge generation and recombination in thin-film, optoelectronic devices
STEFAN ZEISKE
title_short Probing the charge generation and recombination in thin-film, optoelectronic devices
title_full Probing the charge generation and recombination in thin-film, optoelectronic devices
title_fullStr Probing the charge generation and recombination in thin-film, optoelectronic devices
title_full_unstemmed Probing the charge generation and recombination in thin-film, optoelectronic devices
title_sort Probing the charge generation and recombination in thin-film, optoelectronic devices
author_id_str_mv 97df283d21b8fdfcad174628827e4c0b
author_id_fullname_str_mv 97df283d21b8fdfcad174628827e4c0b_***_STEFAN ZEISKE
author STEFAN ZEISKE
author2 STEFAN ZEISKE
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.59296
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Sustainably and environment-friendly manufactured semiconductors are at-tractive candidates for next generation electronic and optoelectronic appli-cations ranging from memory storage and computation, to power manage-ment and energy generation. In this regard, organic semiconductors, i.e., semiconductors based on conjugated carbon-based molecules and polymers derived from earth abundant elements, are the subject of intense basic re-search and technological development efforts. Understanding the funda-mental processes governing these low-mobility and disordered semiconduct-ing materials is therefore key to establish next generation applications based upon flexible and solution-processible organic semiconductors as global com-mercial technologies.The work presented in this thesis focuses on the investigation of charge generation and recombination processes on thin film optoelectronic devices based upon organic semiconductors. A suite of experimental techniques, im-proved measurement setups, and expanded approaches are presented, and form the basis of comprehensive studies on state-of-the-art, high-efficiency organic photovoltaic systems. Specifically, an external quantum efficiency measurement technique with unprecedented dynamic range will be detailed. Using this enhanced apparatus, an approach allowing one to accurately de-termine charge generation quantum yields is introduced. After this, an extended technique to probe photogenerated charge carrier densities is out-lined and applied to thin-film solar cells. Having emphasized the importance of studying charge generation, a combined theoretical and experimental ex-ploration of the light intensity dependence of photocurrent and charge col-lection efficiency under the influence of various loss mechanisms is described. These insights provide the basis of a comprehensive study on organic so-lar cells, where recombination caused by localized trap states is found to be universally present under operational conditions limiting photocurrent and power-conversion efficiency. Overall, the work presented in this thesis expands on existing techniques and approaches, and yields important new understanding as to the device physics of thin-film, optoelectronic applica-tions.
published_date 2022-02-02T04:16:29Z
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score 11.012678

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