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2014 ; 4
(ä): 4243
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gab.com Text
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Roll-to-roll fabrication of large scale and regular arrays of three-dimensional
nanospikes for high efficiency and flexible photovoltaics
#MMPMID24603964
Leung SF
; Gu L
; Zhang Q
; Tsui KH
; Shieh JM
; Shen CH
; Hsiao TH
; Hsu CH
; Lu L
; Li D
; Lin Q
; Fan Z
Sci Rep
2014[Mar]; 4
(ä): 4243
PMID24603964
show ga
Three-dimensional (3-D) nanostructures have demonstrated enticing potency to
boost performance of photovoltaic devices primarily owning to the improved photon
capturing capability. Nevertheless, cost-effective and scalable fabrication of
regular 3-D nanostructures with decent robustness and flexibility still remains
as a challenging task. Meanwhile, establishing rational design guidelines for 3-D
nanostructured solar cells with the balanced electrical and optical performance
are of paramount importance and in urgent need. Herein, regular arrays of 3-D
nanospikes (NSPs) were fabricated on flexible aluminum foil with a roll-to-roll
compatible process. The NSPs have precisely controlled geometry and periodicity
which allow systematic investigation on geometry dependent optical and electrical
performance of the devices with experiments and modeling. Intriguingly, it has
been discovered that the efficiency of an amorphous-Si (a-Si) photovoltaic device
fabricated on NSPs can be improved by 43%, as compared to its planar counterpart,
in an optimal case. Furthermore, large scale flexible NSP solar cell devices have
been fabricated and demonstrated. These results not only have shed light on the
design rules of high performance nanostructured solar cells, but also
demonstrated a highly practical process to fabricate efficient solar panels with
3-D nanostructures, thus may have immediate impact on thin film photovoltaic
industry.