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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 and short-circuit current. Absorption spectra as a function of incident spectrum (a) and short-circuit current (b) as a function of cell thickness of cells E and F, respectively.
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Fig4: Absorption spectra and short-circuit current. Absorption spectra as a function of incident spectrum (a) and short-circuit current (b) as a function of cell thickness of cells E and F, respectively.

Mentions: To observe the improved performance of the above designed solar cell based on double grating back reflector, we have placed one more grating at the top of active silicon region. Figure 4a shows the comparison of absorption in silicon active region of solar cells without top grating (named cell E) and with top and bottom grating/dual grating (named cell F). An improvement in absorption can be observed for shorter wavelength as well as longer wavelength from approximately 780 to 1200 nm. This shows an efficient harvesting of light into solar cell based on dual grating. The short-circuit current (Jsc) obtained from cells E and F as a function of cell thickness is plotted in Figure 4b. The designed solar cell structures with and without top grating is shown in the inset of Figure 4b. Both curves depict as usual effect of cell thickness while dual grating based solar cell is found to be more efficient design with improved short-circuit current as comparison to cell E. The optimal obtained short-circuit current of cell E and F are approximately 30 and 31 mA/cm2, respectively. Remarkably, the use of top grating showed diffraction of shorter wavelength (UV) whereas longer wavelength (IR) trapping is observed by bottom reflector.Figure 4


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 and short-circuit current. Absorption spectra as a function of incident spectrum (a) and short-circuit current (b) as a function of cell thickness of cells E and F, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig4: Absorption spectra and short-circuit current. Absorption spectra as a function of incident spectrum (a) and short-circuit current (b) as a function of cell thickness of cells E and F, respectively.
Mentions: To observe the improved performance of the above designed solar cell based on double grating back reflector, we have placed one more grating at the top of active silicon region. Figure 4a shows the comparison of absorption in silicon active region of solar cells without top grating (named cell E) and with top and bottom grating/dual grating (named cell F). An improvement in absorption can be observed for shorter wavelength as well as longer wavelength from approximately 780 to 1200 nm. This shows an efficient harvesting of light into solar cell based on dual grating. The short-circuit current (Jsc) obtained from cells E and F as a function of cell thickness is plotted in Figure 4b. The designed solar cell structures with and without top grating is shown in the inset of Figure 4b. Both curves depict as usual effect of cell thickness while dual grating based solar cell is found to be more efficient design with improved short-circuit current as comparison to cell E. The optimal obtained short-circuit current of cell E and F are approximately 30 and 31 mA/cm2, respectively. Remarkably, the use of top grating showed diffraction of shorter wavelength (UV) whereas longer wavelength (IR) trapping is observed by bottom reflector.Figure 4

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.