Application Of Micro Fresnel Lenses In Output Enhancement Of Solar Cells
| dc.contributor.author | Liman Chiromawa, Nura | |
| dc.date.accessioned | 2017-01-12T01:54:48Z | |
| dc.date.available | 2017-01-12T01:54:48Z | |
| dc.date.issued | 2016-03 | |
| dc.description.abstract | Fresnel lens have been used in concentration photovoltaic applications to converge the incident solar irradiance on to the solar cells. However, this system suffers from long focal distance, non-uniform illumination on the solar cells and it occupies larger area as compared to that of solar cells. This thesis focuses on the use of smaller size with shorter focal distance (in micrometers) Poly (methyl methacrylate) (PMMA) Fresnel lenses array as a concentrator photovoltaic (CPV) system on silicon solar cells. The system was fabricated using the combinations of the electron beam lithography (EBL) the reactive ion etching (RIE) and the Polydimethylsiloxane (PDMS) replica molding techniques. The results obtained shows that, CPV system containing Fresnel lenses with maximum external diameter of 45.24 𝜇𝑚, have 3025-suns per 𝑐𝑚2 with the approximate focal length 𝑓 of 45 𝜇𝑚. The transmission efficiency of 93.7 % was achieved at an angle of incidence of ≈0𝑜 with f−number≤1 and the optical concentration ratio (OCR) of 95X. The resulting Fresnel lenses array system when place at the focal point (≈45 𝜇𝑚) from the surface of silicon solar cells (Si-Solar cells) increased the open circuit voltage 𝑉𝑂𝐶 from 538.83 mV to 556.73 mV, short current density 𝐽𝑆𝐶 from 11.46 mA/cm2 to 16.66 mA/cm2 and the maximum power 𝑃𝑚𝑎𝑥 from 21.64 mW to 33.06 mW. Meanwhile, this system also enhanced power conversion efficiency of Si-Solar cells from 9.01 % to 9.18 % and decreased the series resistance 𝑅𝑠 of Si-Solar cells from 1.95 Ohms to 1.14 Ohms. In general, these results clearly indicate the advantage of using small size CPV-system in investigating the improvement in the output characteristic parameters of silicon solar cells. Thus, conclusively, the system has the great potentiality in other material solar cells. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/3412 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | Fresnel lenses | en_US |
| dc.title | Application Of Micro Fresnel Lenses In Output Enhancement Of Solar Cells | en_US |
| dc.type | Thesis | en_US |
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