Mid-infrared emissivity of crystalline silicon solar cells
| Autor: | D. Alonso Alvarez, Nicholas J. Ekins-Daukes, Christos N. Markides, Alexander Mellor, L. Ferre Llin, Daniel Chemisana, Alberto Riverola, Douglas J. Paul, I. Guarracino |
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| Přispěvatelé: | Commission of the European Communities, Engineering & Physical Science Research Council (EPSRC), Engineering & Physical Science Research Council (E |
| Rok vydání: | 2018 |
| Předmět: |
Normal cell operating temperature
Astrophysics::High Energy Astrophysical Phenomena 020209 energy Astrophysics::Cosmology and Extragalactic Astrophysics 02 engineering and technology 7. Clean energy 09 Engineering law.invention Low emissivity Optics law Solar cell Thermal 0202 electrical engineering electronic engineering information engineering Radiative transfer Emissivity Crystalline silicon Absorption (electromagnetic radiation) Mid-infrared Astrophysics::Galaxy Astrophysics 02 Physical Sciences Energy Renewable Energy Sustainability and the Environment business.industry Photovoltaic system Surfaces Coatings and Films Electronic Optical and Magnetic Materials Hybrid photovoltaic-thermal Optoelectronics 03 Chemical Sciences business |
| Zdroj: | Repositorio Abierto de la UdL Universitad de Lleida Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/j.solmat.2017.10.002 |
| Popis: | The thermal emissivity of crystalline silicon photovoltaic (PV) solar cells plays a role in determining the operating temperature of a solar cell. To elucidate the physical origin of thermal emissivity, we have made an experimental measurement of the full radiative spectrum of the crystalline silicon (c-Si) solar cell, which includes both absorption in the ultraviolet to near-infrared range and emission in the mid-infrared. Using optical modelling, we have identified the origin of radiative emissivity in both encapsulated and unencapsulated solar cells. We find that both encapsulated and unencapsulated c-Si solar cells are good radiative emitters but achieve this through different effects. The emissivity of an unencapsulated c-Si solar cell is determined to be 75% in the MIR range, and is dominated by free-carrier emission in the highly doped emitter and back surface field layers; both effects are greatly augmented through the enhanced optical outcoupling arising from the front surface texture. An encapsulated glass-covered cell has an average emissivity around 90% on the MIR, and dips to 70% at 10 µm and is dominated by the emissivity of the cover glass. These findings serve to illustrate the opportunity for optimising the emissivity of c-Si based collectors, either in conventional c-Si PV modules where high emissivity and low-temperature operation is desirable, or in hybrid PV-thermal collectors where low emissivity enables a higher thermal output to be achieved. This research was supported by the 'Ministerio de Economía y Competitividad' of Spain (grants ENE2013-48325-R, BES-2014-069596 and EEBB-I-16-11459) and the by the UK Engineering and Physical Science Research Council (EPSRC) [grant number EP/M025012/1]. A. Mellor was supported by the European Commission through Marie Sklodowska Curie International Fellowship, Grant No. DLV-657359. Re fl ection and Transmission measurements were performed by Dr. Volker Kübler in the Micro-structured Surfaces Group of Fraunhofer- ISE, Freiburg, Germany. |
| Databáze: | OpenAIRE |
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