Performance of GaAs Nanowire Array Solar Cells for Varying Incidence Angles
| Autor: | Omid Madani Ghahfarokhi, Ingvar Åberg, Lars Samuelson, Nicklas Anttu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanowire Physics::Optics 02 engineering and technology 01 natural sciences 7. Clean energy law.invention Gallium arsenide chemistry.chemical_compound Optics law 0103 physical sciences Solar cell Electrical and Electronic Engineering Absorption (electromagnetic radiation) 010302 applied physics business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Ray Electronic Optical and Magnetic Materials Wavelength Tilt (optics) chemistry Optoelectronics Diffuse reflection 0210 nano-technology business |
| Zdroj: | IEEE Journal of Photovoltaics |
| ISSN: | 2156-3403 2156-3381 |
| DOI: | 10.1109/jphotov.2016.2604564 |
| Popis: | Nanowire array solar cells show intrinsic light trapping and absorption enhancement properties due to the diffraction and optical resonances. Here, we report the effect of varying incidence angle on the performance of GaAs nanowire array solar cells. We provide experimental evidence that nanowire array solar cells are highly efficient at gathering diffuse or tilted incident light, even at very high incidence angles; hence, the performance of the nanowire solar cell is retained up to these high incident light angles. Specifically, the measured efficiency at an incidence angle of 60° is 95% of the efficiency at normal incidence. Moreover, our measurements show that a nonzero incidence angle is beneficial for wavelengths above 600 nm, which results in an efficiency improvement by 0.5% absolute points. This increase is so large that we even measure a small increase in absolute output power at 15° tilt, thus, more than fully compensating for the reduced incoming power over the cell with increasing tilt. We show how this gain arises from an enhanced absorption in the part of the nanowire with a high probability of charge extraction. Thus, nanowires show great promise for the delivery of high efficiency in practical nontracking positioning conditions, as well as under diffuse light illumination. |
| Databáze: | OpenAIRE |
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