Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells
The optical band gap of the light absorber and the alignment of its bands with the underlying wide band gap metal oxide are critical for efficient light harvesting and charge separation in semiconductor-sensitized solar cells (SSCs). In practice, these two requirements are however not always fulfill...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/101221 http://hdl.handle.net/10220/11070 |
| _version_ | 1811693041091608576 |
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| author | Hossain, Md. Anower Jennings, James Robert Mathews, Nripan Wang, Qing |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Hossain, Md. Anower Jennings, James Robert Mathews, Nripan Wang, Qing |
| author_sort | Hossain, Md. Anower |
| collection | NTU |
| description | The optical band gap of the light absorber and the alignment of its bands with the underlying wide band gap metal oxide are critical for efficient light harvesting and charge separation in semiconductor-sensitized solar cells (SSCs). In practice, these two requirements are however not always fulfilled concomitantly in SSCs. Favourable band alignment in CdSe-sensitized TiO2 requires utilization of quantum sized CdSe, which causes great losses in the harvesting of long wavelength photons due to quantum confinement effects. In the present study, ternary cadmium sulfoselenide (CdSxSe1−x), which has a tunable band gap between those of CdSe and CdS without reducing the dimension, was proposed as a sensitizer for TiO2. CdSxSe1−x was successfully synthesized by alternately depositing CdS and CdSe layers under ambient conditions. SSCs utilizing CdSxSe1−x-sensitized TiO2 yielded a power conversion efficiency of 4.05% under simulated AM1.5 100 mW cm−2 illumination, rivalling the well-studied cascaded CdS/CdSe electrodes when an aqueous polysulfide solution was used as the electrolyte and Cu2S as the counter electrode. The findings of the present study provide an alternative and viable approach for optimizing the energetics of semiconductor sensitizers for efficient charge separation, while also maintaining good light harvesting. |
| first_indexed | 2024-10-01T06:45:22Z |
| format | Journal Article |
| id | ntu-10356/101221 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:45:22Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/1012212020-06-01T10:01:35Z Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells Hossain, Md. Anower Jennings, James Robert Mathews, Nripan Wang, Qing School of Materials Science & Engineering The optical band gap of the light absorber and the alignment of its bands with the underlying wide band gap metal oxide are critical for efficient light harvesting and charge separation in semiconductor-sensitized solar cells (SSCs). In practice, these two requirements are however not always fulfilled concomitantly in SSCs. Favourable band alignment in CdSe-sensitized TiO2 requires utilization of quantum sized CdSe, which causes great losses in the harvesting of long wavelength photons due to quantum confinement effects. In the present study, ternary cadmium sulfoselenide (CdSxSe1−x), which has a tunable band gap between those of CdSe and CdS without reducing the dimension, was proposed as a sensitizer for TiO2. CdSxSe1−x was successfully synthesized by alternately depositing CdS and CdSe layers under ambient conditions. SSCs utilizing CdSxSe1−x-sensitized TiO2 yielded a power conversion efficiency of 4.05% under simulated AM1.5 100 mW cm−2 illumination, rivalling the well-studied cascaded CdS/CdSe electrodes when an aqueous polysulfide solution was used as the electrolyte and Cu2S as the counter electrode. The findings of the present study provide an alternative and viable approach for optimizing the energetics of semiconductor sensitizers for efficient charge separation, while also maintaining good light harvesting. 2013-07-09T07:13:43Z 2019-12-06T20:35:21Z 2013-07-09T07:13:43Z 2019-12-06T20:35:21Z 2012 2012 Journal Article Hossain, M. A., Jennings, J. R., Mathews, N., Wang, Q. (2012). Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells. Physical Chemistry Chemical Physics, 14(19), 7154-7161. https://hdl.handle.net/10356/101221 http://hdl.handle.net/10220/11070 10.1039/C2CP40277G en Phyiscal chemistry chemical physics © 2012 The Owner Societies. |
| spellingShingle | Hossain, Md. Anower Jennings, James Robert Mathews, Nripan Wang, Qing Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title | Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title_full | Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title_fullStr | Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title_full_unstemmed | Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title_short | Band engineered ternary solid solution CdSxSe1−x-sensitized mesoscopic TiO2 solar cells |
| title_sort | band engineered ternary solid solution cdsxse1 x sensitized mesoscopic tio2 solar cells |
| url | https://hdl.handle.net/10356/101221 http://hdl.handle.net/10220/11070 |
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