Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism
Monolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-se...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/11/9/817 |
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| author | Sitansu Sekhar Nanda Minjik Kim Sung Jong Yoo Georgia C. Papaefthymiou Dong Kee Yi |
| author_facet | Sitansu Sekhar Nanda Minjik Kim Sung Jong Yoo Georgia C. Papaefthymiou Dong Kee Yi |
| author_sort | Sitansu Sekhar Nanda |
| collection | DOAJ |
| description | Monolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-sensor via an electrochemical cell mechanism; it was possible to tune current densities under light illumination. Electrochemical tests on a quantum dot capacitor, using different sized (red, yellow and green) cadmium-selenium quantum dots on indium tin oxide substrates, showed typical capacitive behavior of cyclic voltammetry curves in 2M H<sub>2</sub>SO<sub>4</sub> aqueous solutions. This arrangement provides a beneficial effect in, both, charge separation and light sensory characteristics. Importantly, the photocurrent density depended on quantum yield rendering tunable photo-sensing properties. |
| first_indexed | 2024-03-10T16:44:19Z |
| format | Article |
| id | doaj.art-db6f3a95b30449febcb0ae45ca4d6af4 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T16:44:19Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-db6f3a95b30449febcb0ae45ca4d6af42023-11-20T11:47:32ZengMDPI AGMicromachines2072-666X2020-08-0111981710.3390/mi11090817Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical MechanismSitansu Sekhar Nanda0Minjik Kim1Sung Jong Yoo2Georgia C. Papaefthymiou3Dong Kee Yi4Department of Chemistry, Myongji University, Yongin-si 17058, KoreaDepartment of Chemistry, Myongji University, Yongin-si 17058, KoreaCenter for Hydrogen·Fuel Cell Research, Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seoul 02792, KoreaDepartment of Physics, Villanova University, Villanova, PA 19085, USADepartment of Chemistry, Myongji University, Yongin-si 17058, KoreaMonolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-sensor via an electrochemical cell mechanism; it was possible to tune current densities under light illumination. Electrochemical tests on a quantum dot capacitor, using different sized (red, yellow and green) cadmium-selenium quantum dots on indium tin oxide substrates, showed typical capacitive behavior of cyclic voltammetry curves in 2M H<sub>2</sub>SO<sub>4</sub> aqueous solutions. This arrangement provides a beneficial effect in, both, charge separation and light sensory characteristics. Importantly, the photocurrent density depended on quantum yield rendering tunable photo-sensing properties.https://www.mdpi.com/2072-666X/11/9/817CdSequantum dotscapacitorsemiconductor electrodephoto-sensor |
| spellingShingle | Sitansu Sekhar Nanda Minjik Kim Sung Jong Yoo Georgia C. Papaefthymiou Dong Kee Yi Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism Micromachines CdSe quantum dots capacitor semiconductor electrode photo-sensor |
| title | Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism |
| title_full | Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism |
| title_fullStr | Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism |
| title_full_unstemmed | Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism |
| title_short | Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism |
| title_sort | monolayer quantum dot based light sensor by a photo electrochemical mechanism |
| topic | CdSe quantum dots capacitor semiconductor electrode photo-sensor |
| url | https://www.mdpi.com/2072-666X/11/9/817 |
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