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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

COUPLING EFFECTS OF NANOSTRUCTURES ON THE PHOTOVOLTAICS PERFORMANCE IN MULTI-PHYSICS

Yi-Peng Zhou
Xian Jiaotong University, 28 Xian Ning West Rd. Xi'an, Shaanxi 710049, China

Ya-Ling He
Key Laboratory of Thermo-fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China

Du Shen
Xian Jiaotong University, 28 Xian Ning West Rd. Xi'an, Shaanxi 710049, China

DOI: 10.1615/IHTC16.nmt.022237
pages 6915-6922


SCHLÜSSELWÖRTER: Solar energy, Nano/Micro scale measurement and simulation, multi-physics, photovoltaics

Abstrakt

Nanostructured front surface is an important way to improve the solar irradiance absorption of the photovoltaics. However, the nanostructure with lower reflectance results in the higher temperature and the higher surface recombination, which reduce the photovoltaics efficiency. A coupling mathematic model is developed for the multi-physics in photovoltaics, which includes the near-field optics, the photovoltaic conversion, and the heat transfer. An all-back-contact N-type silicon photovoltaics model with the cone nanostructured front surface is built. Five cone nanostructures with different dimensions are chosen for the analysis. Their average reflectance Ra is inversely proportional to the surface area enhancement ratio Ar. Under the conditions of AM1.5 and the ambient temperature of 300K, the maximum output power density increases first and then decreases with the increase of Ra. This is because, when Ra is too low, high surface recombination and high temperature will diminish the advantage of the cone nanostructure with low average reflectance (more electron-hole pairs), and become the main factors in reducing photovoltaics performance. In dynamic analysis, the daily power generation per square meter of photovoltaics with the Ra of 5.07% is 8.24% more than that with the Ra of 0.70% in the spring. Furthermore, the annual power generation per square meter of photovoltaics with the Ra of 5.07% is 38.8 kW*h/m2 more than that with the Ra of 0.70%. Therefore, it is unnecessary to make the reflectance of nanostructure as low as possible.

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