Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes
Heterojunctions are typically used to generate large photovoltages and to influence the direction of flow of charge carriers on photovoltaic and photocatalytic devices. Herein, we propose how heterojunctions can be used as a pathway for tuning the peak position of redox active monolayers. This was p...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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AMER CHEMICAL SOC
2020
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/CE14100036 http://hdl.handle.net/20.500.11937/80751 |
| _version_ | 1848764265371009024 |
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| author | Gonçales, V.R. Lian, J. Gautam, S. Hagness, D. Yang, Y. Tilley, R.D. Ciampi, Simone Gooding, J.J. |
| author_facet | Gonçales, V.R. Lian, J. Gautam, S. Hagness, D. Yang, Y. Tilley, R.D. Ciampi, Simone Gooding, J.J. |
| author_sort | Gonçales, V.R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Heterojunctions are typically used to generate large photovoltages and to influence the direction of flow of charge carriers on photovoltaic and photocatalytic devices. Herein, we propose how heterojunctions can be used as a pathway for tuning the peak position of redox active monolayers. This was possible by exploring the principle of contact between materials in heterojunctions leading to a common equilibrium Fermi level for both sides of the heterojunction. The phenomenon was demonstrated with thin layers of intrinsic amorphous silicon deposited on platinum, indium tin oxide, and either n-type or p-type crystalline silicon electrodes. At fixed light-intensity conditions, the potential required for electron transfer of a model redox probe was modulated according to the substrate on which the amorphous silicon was deposited. This allowed us to alter the peak position of a redox process occurring on the electrolyte side of the junction despite it being isolated from the underlying conducting material. We show how such an effect can be explored in a potential range that encompasses any of the redox monolayers electroactive in aqueous electrolytes. |
| first_indexed | 2025-11-14T11:16:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-80751 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:16:36Z |
| publishDate | 2020 |
| publisher | AMER CHEMICAL SOC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-807512021-01-06T00:35:25Z Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes Gonçales, V.R. Lian, J. Gautam, S. Hagness, D. Yang, Y. Tilley, R.D. Ciampi, Simone Gooding, J.J. Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science CLICK CHEMISTRY LIGHT ELECTRODES FUNCTIONALIZATION ELECTROCHEMISTRY SEMICONDUCTORS OPTIMIZATION INTENSITY OXIDATION Heterojunctions are typically used to generate large photovoltages and to influence the direction of flow of charge carriers on photovoltaic and photocatalytic devices. Herein, we propose how heterojunctions can be used as a pathway for tuning the peak position of redox active monolayers. This was possible by exploring the principle of contact between materials in heterojunctions leading to a common equilibrium Fermi level for both sides of the heterojunction. The phenomenon was demonstrated with thin layers of intrinsic amorphous silicon deposited on platinum, indium tin oxide, and either n-type or p-type crystalline silicon electrodes. At fixed light-intensity conditions, the potential required for electron transfer of a model redox probe was modulated according to the substrate on which the amorphous silicon was deposited. This allowed us to alter the peak position of a redox process occurring on the electrolyte side of the junction despite it being isolated from the underlying conducting material. We show how such an effect can be explored in a potential range that encompasses any of the redox monolayers electroactive in aqueous electrolytes. 2020 Journal Article http://hdl.handle.net/20.500.11937/80751 10.1021/acs.jpcc.9b11252 English http://purl.org/au-research/grants/arc/CE14100036 http://purl.org/au-research/grants/arc/FL150100060 AMER CHEMICAL SOC fulltext |
| spellingShingle | Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science CLICK CHEMISTRY LIGHT ELECTRODES FUNCTIONALIZATION ELECTROCHEMISTRY SEMICONDUCTORS OPTIMIZATION INTENSITY OXIDATION Gonçales, V.R. Lian, J. Gautam, S. Hagness, D. Yang, Y. Tilley, R.D. Ciampi, Simone Gooding, J.J. Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title | Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title_full | Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title_fullStr | Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title_full_unstemmed | Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title_short | Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes |
| title_sort | heterojunctions based on amorphous silicon: a versatile surface engineering strategy to tune peak position of redox monolayers on photoelectrodes |
| topic | Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science CLICK CHEMISTRY LIGHT ELECTRODES FUNCTIONALIZATION ELECTROCHEMISTRY SEMICONDUCTORS OPTIMIZATION INTENSITY OXIDATION |
| url | http://purl.org/au-research/grants/arc/CE14100036 http://purl.org/au-research/grants/arc/CE14100036 http://hdl.handle.net/20.500.11937/80751 |