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Featured researches published by Kean Fong.


photovoltaic specialists conference | 2016

Rounded rear pyramidal texture for high efficiency silicon solar cells

Ngwe Soe Zin; Keith R. McIntosh; Teng Kho; Evan Franklin; Kean Fong; Matthew Stocks; Er-Chien Wang; T. Ratcliff; Andrew Blakers

Interdigitated back-contact (IBC) solar cells developed in the past two years have efficiencies in the range 24.4%-25.6% As high as these efficiencies are, there are opportunities to increase them further by improving on the light trapping. Silicon solar cells incorporating double-sided pyramidal texture are capable of superior light trapping than cells with texture on just the front. One of the principle losses of double-sided pyramidal texture is the light that escapes after a second pass through the cell when the facet angles are the same on the front and rear. This contribution investigates how this loss might be reduced by changing the facet angle of the rear pyramids. A textured pyramid rounding is introduced to improve the light trapping. The reduction in surface recombination that rounding the facets introduces is also evaluated. With confocal microscopy, spectrophotometry and ray tracing, the rounding etch time required to yield the best light trapping is investigated. With photoconductance lifetime measurements, the surface recombination is found to continue to decrease as the rounding time increases. The spectrophotometry and ray tracing suggests that the double sided textured samples featuring rounded rear pyramids have superior light trapping to the sample with a planar rear surface. The high-efficiency potential of rounded textured pyramids in silicon solar cells is demonstrated by the fabrication of 24% efficient back-contact silicon solar cells.


photovoltaic specialists conference | 2014

Etch-back simplifies interdigitated back contact solar cells

Ngwe Soe Zin; Andrew Blakers; Evan Franklin; Kean Fong; Teng Kho; Chog Barugkin; Er-Chien Wang

The process of making Interdigitated Back Contact (IBC) solar cell is implemented by a novel simplified etch-back technique, while aiming for no compromise on high-efficiency potentials. Simplified etch-back creates localized heavy and light phosphorus and boron diffusions simultaneously. This process also leaves localised heavy diffusions to be approximately a micron higher than neighbouring light diffusion regions. In comparison to the IBC solar cells that ANU developed to date [1], key advantages of this technique feature reduction in cell process steps; requires only two diffusions to create p, p+, n and n+ diffusions; no high-temperature oxidation masking steps required as diffusion barriers; independent optimization of contact recombination, lateral carriers transport and surface passivation; and potential higher silicon bulk lifetime and reduced contamination due to low thermal budget. Based on the etch-back technique, the total saturation current density deduced from the test structures for the IBC cell is below 30 fA/cm2.


Progress in Photovoltaics | 2016

Design, fabrication and characterisation of a 24.4% efficient interdigitated back contact solar cell

Evan Franklin; Kean Fong; Keith R. McIntosh; Andreas Fell; Andrew Blakers; Teng Kho; Daniel Walter; Da Wang; Ngwe Soe Zin; Matthew Stocks; Er-Chien Wang; Nicholas E. Grant; Yimao Wan; Y. Yang; Xueling Zhang; Zhiqiang Feng; Pierre J. Verlinden


Energy Procedia | 2013

High Efficiency Silicon Solar Cells

Andrew Blakers; Ngwe Soe Zin; Keith R. McIntosh; Kean Fong


photovoltaic specialists conference | 2014

Quantifying the optical losses in back-contact solar cells

Keith R. McIntosh; Teng Kho; Kean Fong; Simeon C. Baker-Finch; Yimao Wan; Ngwe Soe Zin; Evan Franklin; Dingcheng Wang; Malcolm Abbott; Nicholas E. Grant; Er-Chien Wang; Matthew Stocks; Andrew Blakers


world conference on photovoltaic energy conversion | 2013

Optimisation of N+ Diffusion and Contact Size of IBC Solar Cells

Andreas Fell; S.Z. Ngwe; Evan Franklin; Andrew Blakers; Keith R. McIntosh; K. Teng; Kean Fong


Solar Energy Materials and Solar Cells | 2015

Damage-free ultraviolet nanosecond laser ablation for high efficiency back contact solar cell fabrication

Daniel Walter; Andreas Fell; Evan Franklin; Da Wang; Kean Fong; Teng Kho; Klaus Weber; Andrew Blakers


Solar Energy Materials and Solar Cells | 2018

Erratum to “Polyimide for silicon solar cells with double-sided textured pyramids” [Sol. Energy Mater. Sol. Cells 183 (2018) 200–204]

Ngwe Soe Zin; Keith R. McIntosh; Sara Bakhshi; Abraham Vázquez-Guardado; Teng Kho; Kean Fong; Matthew Stocks; Evan Franklin; Andrew Blakers


Solar Energy Materials and Solar Cells | 2018

Exceptional silicon surface passivation by an ONO dielectric stack

Teng Choon Kho; Kean Fong; Keith R. McIntosh; Evan Franklin; Nicholas E. Grant; Matthew Stocks; Sieu Pheng Phang; Yimao Wan; Er-Chien Wang; Kaushal Vora; Zin Ngwe; Andrew Blakers


Solar Energy Materials and Solar Cells | 2018

Polyimide for silicon solar cells with double-sided textured pyramids

Ngwe Soe Zin; Keith R. McIntosh; Sara Bakhshi; Abraham Vázquez-Guardado; Teng Kho; Kean Fong; Matthew Stocks; Evan Franklin; Andrew Blakers

Collaboration


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Andrew Blakers

Australian National University

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Evan Franklin

Australian National University

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Keith R. McIntosh

Australian National University

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Teng Kho

Australian National University

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Ngwe Soe Zin

Australian National University

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Er-Chien Wang

Australian National University

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Matthew Stocks

Australian National University

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Andreas Fell

Australian National University

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Vernie Everett

Australian National University

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Daniel Walter

Australian National University

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