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Performance evaluation of thin film silicon solar cell based on dual diffraction grating.

Dubey RS, Saravanan S, Kalainathan S - Nanoscale Res Lett (2014)

Bottom Line: Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance.Use of metal layer as a part of back reflector has found to be promising for minimum requirement of DBR pairs.The effect of grating and anti-reflection coating thicknesses are also investigated for absorption enhancement.

View Article: PubMed Central - PubMed

Affiliation: Advanced Research Laboratory for Nanomaterials and Devices, Department of Nanotechnology, Swarnandhra College of Engineering and Technology, Seetharampuram, Narsapur, Andhra Pradesh, India, rag_pcw@yahoo.co.in.

ABSTRACT
Light-trapping structures are more demanding for optimal light absorption in thin film silicon solar cells. Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance. This paper deals with a design of thin film silicon solar cells and explores the influence of bottom grating and combination of top and bottom (dual) grating as a part of back reflector with a distributed Bragg reflector (DBR). Use of metal layer as a part of back reflector has found to be promising for minimum requirement of DBR pairs. The effect of grating and anti-reflection coating thicknesses are also investigated for absorption enhancement. With optimization, high performance has been achieved from dual grating-based solar cell with a relative enhancement in short-circuit current approximately 68% while it was approximately 55% in case of bottom grating-based solar cell. Our designing efforts show enhanced absorption of light in UV and infrared part of solar spectrum.

No MeSH data available.


Absorption spectra. Absorption spectra of solar cell designs A, B, C, and D (a) and short-circuit current as a function of DBR pairs (b), respectively.
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Fig2: Absorption spectra. Absorption spectra of solar cell designs A, B, C, and D (a) and short-circuit current as a function of DBR pairs (b), respectively.

Mentions: In this work, we have explored the analysis of single layer (SG) (refer to Figure 1b), double layer (DG), and dual grating-based solar cells (refer to inset Figure 4b). We have designed four solar cells named as cell A (ARC + SG + 2 DBR), cell B (ARC + SG + 2 DBR + metal), cell C (ARC + DG + 1 DBR), and cell D (ARC + DG + 1 DBR + metal). Figure 2a shows absorption spectra of four solar cells A, B, C, and D. The curve of solar cell A depicts overlapped absorption curves with others at shorter wavelength but enhanced absorption beyond approximately 510 nm. Further, improved absorption can be noticed at approximately 850 and 1060 nm. By increasing number of DBR, an enhancement of light absorption was observed (not shown here) but it was maximum for two pairs of DBR-based solar cell. For cell B, use of a metal layer has given a similar trend in curve but with enhanced absorption as compared to the case of without metal layer. By comparing curves of cells A and B, we can observe enhanced absorption from cell B in wavelength range 507 to 1060 nm. The obtained short-circuit current are for cell A approximately 26.95 and cell B approximately 27.17 mA/cm2, respectively. Absorption curves of cells C ad D show distinct results when single grating is replaced with double grating. By comparing curves of cells A and B, we can observe an enhancement in absorption; however, it is dominant in infrared region of incident solar spectrum. It is noteworthy that one DBR pair with double grating combination produces short-circuit current up to approximately 27.65 mA/cm2 whereas it was 26.95 mA/cm2 for two DBR pairs with a single grating combination. Further, the use of a metal layer (cell D) has improved the performance of solar cell in the wavelength approximately 510 to 1060 nm.Figure 2


Performance evaluation of thin film silicon solar cell based on dual diffraction grating.

Dubey RS, Saravanan S, Kalainathan S - Nanoscale Res Lett (2014)

Absorption spectra. Absorption spectra of solar cell designs A, B, C, and D (a) and short-circuit current as a function of DBR pairs (b), respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494017&req=5

Fig2: Absorption spectra. Absorption spectra of solar cell designs A, B, C, and D (a) and short-circuit current as a function of DBR pairs (b), respectively.
Mentions: In this work, we have explored the analysis of single layer (SG) (refer to Figure 1b), double layer (DG), and dual grating-based solar cells (refer to inset Figure 4b). We have designed four solar cells named as cell A (ARC + SG + 2 DBR), cell B (ARC + SG + 2 DBR + metal), cell C (ARC + DG + 1 DBR), and cell D (ARC + DG + 1 DBR + metal). Figure 2a shows absorption spectra of four solar cells A, B, C, and D. The curve of solar cell A depicts overlapped absorption curves with others at shorter wavelength but enhanced absorption beyond approximately 510 nm. Further, improved absorption can be noticed at approximately 850 and 1060 nm. By increasing number of DBR, an enhancement of light absorption was observed (not shown here) but it was maximum for two pairs of DBR-based solar cell. For cell B, use of a metal layer has given a similar trend in curve but with enhanced absorption as compared to the case of without metal layer. By comparing curves of cells A and B, we can observe enhanced absorption from cell B in wavelength range 507 to 1060 nm. The obtained short-circuit current are for cell A approximately 26.95 and cell B approximately 27.17 mA/cm2, respectively. Absorption curves of cells C ad D show distinct results when single grating is replaced with double grating. By comparing curves of cells A and B, we can observe an enhancement in absorption; however, it is dominant in infrared region of incident solar spectrum. It is noteworthy that one DBR pair with double grating combination produces short-circuit current up to approximately 27.65 mA/cm2 whereas it was 26.95 mA/cm2 for two DBR pairs with a single grating combination. Further, the use of a metal layer (cell D) has improved the performance of solar cell in the wavelength approximately 510 to 1060 nm.Figure 2

Bottom Line: Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance.Use of metal layer as a part of back reflector has found to be promising for minimum requirement of DBR pairs.The effect of grating and anti-reflection coating thicknesses are also investigated for absorption enhancement.

View Article: PubMed Central - PubMed

Affiliation: Advanced Research Laboratory for Nanomaterials and Devices, Department of Nanotechnology, Swarnandhra College of Engineering and Technology, Seetharampuram, Narsapur, Andhra Pradesh, India, rag_pcw@yahoo.co.in.

ABSTRACT
Light-trapping structures are more demanding for optimal light absorption in thin film silicon solar cells. Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance. This paper deals with a design of thin film silicon solar cells and explores the influence of bottom grating and combination of top and bottom (dual) grating as a part of back reflector with a distributed Bragg reflector (DBR). Use of metal layer as a part of back reflector has found to be promising for minimum requirement of DBR pairs. The effect of grating and anti-reflection coating thicknesses are also investigated for absorption enhancement. With optimization, high performance has been achieved from dual grating-based solar cell with a relative enhancement in short-circuit current approximately 68% while it was approximately 55% in case of bottom grating-based solar cell. Our designing efforts show enhanced absorption of light in UV and infrared part of solar spectrum.

No MeSH data available.