The improvement on the performance of quantum dot-sensitized solar cells with functionalized Si
| Autor: | Masaharu Shiratani, Giichiro Uchida, Naho Itagaki, Kunihiro Kamataki, Yuting Wang, Hyunwoong Seo, Kazunori Koga, Muneharu Sato |
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| Rok vydání: | 2013 |
| Předmět: |
Photocurrent
Materials science business.industry Exciton Photovoltaic system Metals and Alloys Nanotechnology Surfaces and Interfaces Chemical vapor deposition Surfaces Coatings and Films Electronic Optical and Magnetic Materials Multiple exciton generation Electron transfer Quantum dot Materials Chemistry Optoelectronics Surface modification business |
| Zdroj: | Thin Solid Films. 546:284-288 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2013.04.073 |
| Popis: | Quantum dots (QDs) have been attractive recently with their multiple exciton generation characteristics. QD solar cells can more effectively use the incident energy because one or more electrons are generated with the photon of high energy. They have less heat loss and higher theoretical efficiency (44%) than single exciton generation solar cells (33%). This work focused on Si as alternative to conventional QD materials. Si has QD's unique characteristics such as the quantum size effect and quantum confinement with non-toxicity and abundance. Si QDs were fabricated by the multi-hollow discharge plasma chemical vapor deposition and applied to QD-sensitized solar cells (QDSCs). Contrary to the good characteristics of Si QDs, Si QDSCs had poor performance as compared with conventional QDSCs because of the weak combination between Si QDs and TiO 2 . Small amounts of adsorbed Si QD on TiO 2 made low photocurrent and TiO 2 surface widely exposed to redox electrolyte caused charge recombination, the decrease of open-circuit voltage, and low fill factor. For improving their combination, Si QDs were functionalized. The electron transfer from Si to TiO 2 and the bonding with TiO 2 were improved and more Si QDs were adsorbed by the functionalization. In the functionalization process, the linking source is one of the key parameters. Therefore, 4-vinylbenzoic acid was controlled and its effect was analyzed. The change in the photovoltaic parameters according to the concentration of 4-vinylbenzoic acid and the performance dependence were investigated. In order to verify their characteristics, the effects in terms of the photovoltaic performance, electrochemical impedance, and optical properties were examined. |
| Databáze: | OpenAIRE |
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