Aligned Single‐Crystalline Si Nanowire Arrays for Photovoltaic Applications

Peng, Kui‐Qing; Xu, Ying; Yin, Wang; Yan, Yuxin; Lee, Shuit‐Tong; Zhu, Jing

doi:10.1002/smll.200500137

Cited by 825 publications

(658 citation statements)

References 41 publications

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“…This feature is different from those of all the Si NWAs synthesized by other methods before in which little interconnections exist. [1][2][3][4]14 It can be deduced that these connections provide the structure strength of the arrays so that the as-synthesized Si NWAs could be freestanding. Spotty rings are shown in the SAED pattern of a part of one nanowire (inset of Fig.…”

mentioning

confidence: 99%

Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

Ying

et al. 2013

Chem. Commun.

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confidence: 99%

Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

Ying

et al. 2013

Chem. Commun.

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“…͓doi:10.1063/1.3567527͔ To achieve a high energy conversion efficiency, a solar cell must be thick enough for sufficient light absorption, yet it must be thin enough for efficient carrier collection. [1][2][3] Recently, the applications of nanocoax, 1 nanocone, 4,5 nanodome, 6 nanopillar, 7,8 nanorod, 2,3,9-13 and nanowire [14][15][16][17][18][19][20][21][22][23][24] structures for solar cells have attracted great interest. Compared to the conventional planar thin film counterparts, the nanostructured devices demonstrate the benefits of enhancing charge collection and improving light absorption simultaneously, due to their unique geometry.…”

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Nanorod solar cell with an ultrathin a-Si:H absorber layer

Kuang

Werf

Houweling

et al. 2011

Applied Physics Letters

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We propose a nanostructured three-dimensional ͑nano-3D͒ solar cell design employing an ultrathin hydrogenated amorphous silicon ͑a-Si:H͒ n-i-p junction deposited on zinc oxide ͑ZnO͒ nanorod arrays. The ZnO nanorods were prepared by aqueous chemical growth at 80°C. The photovoltaic performance of the nanorod/a-Si:H solar cell with an ultrathin absorber layer of only 25 nm is experimentally demonstrated. An efficiency of 3.6% and a short-circuit current density of 8.3 mA/ cm 2 were obtained, significantly higher than values achieved for planar or even textured counterparts with three times thicker ͑ϳ75 nm͒ a-Si:H absorber layers.

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“…All ligands were obtained commercially, with the exception of ligand 3, which was prepared according to literature [21]. Electroless etched SiNWs were prepared following a reported method [22]. A p-type Si (100) substrate (Wafternet, 10 15 cm 3 , B-doped; 10-20 Ω cm) was cleaned with acetone, methanol, and isopropanol sequentially and then oxidized in H 2 O 2 /H 2 SO 4 1:3 at 90°C for 10 min to remove heavy metals and organic species.…”

Section: Methodsmentioning

confidence: 99%

Tuning redox potentials of CO2 reduction catalysts for carbon photofixation by Si nanowires

Stephani

Tan

et al. 2015

Sci. China Mater.

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(Liu R)) plex polymer junction by Chardon-Noblat et al. [16]. The Faradic efficiency was measured at 63% in aqueous solutions. These results are encouraging because they show that catalysts can not only increase the efficiency when converting solar energy into chemical energy, but also increase the product selectivity by limiting the reaction pathway, especially for CO 2 photoreduction. Concurrently, our group has demonstrated that high product selectivity can be achieved by avoiding directly passing electrons to carbon in CO 2 [17,18]. Instead, when a reactive intermediate is activated by light-driven reactions, it binds with and reduces CO 2 in a highly specific manner. Our approach is inspired by dark reactions in natural photosynthesis. We have shown that the reactive intermediate can be a substrate or a metal catalyst (Scheme 1), the latter of which promises a broader scope of reactions. Building upon our previous success, herein we report that the redox potentials of the intermediate can be readily tuned to match the reducing power of the Si nanowire photocathode.Controlling redox potentials of catalysts is important because how they align with the energetics of the photoelectrode determines the ease or difficulty of charge transfer at the electrode/catalyst interface. For instance, for reduction reactions, the redox potential of the catalyst needs to be more negative than the Fermi level of the semiconductor to allow for the flow of electrons from semiconductor to catalyst. Additionally, the overpotential of the charge transfer from semiconductor to catalyst should be sufficiently small. All these considerations add extra challenges to find suitable semiconductor/catalyst pairs for practical CO 2 reduction. The semiconductors are limited by the following requirement in a high efficient photoelectrochemical cells: 1) suitable band gap to absorb large portion of solar light; 2) high-quantum efficiency of light to electron conversion; 3) long charge diffusion length of the bulk material to reduce charge recombination; 4) earth abundance for low cost at large scales. Only a handful of semiconductors meet these

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Aligned Single‐Crystalline Si Nanowire Arrays for Photovoltaic Applications

Cited by 825 publications

References 41 publications

Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

Facile synthesis of freestanding Si nanowire arrays by one-step template-free electro-deoxidation of SiO2 in a molten salt

Nanorod solar cell with an ultrathin a-Si:H absorber layer

Tuning redox potentials of CO2 reduction catalysts for carbon photofixation by Si nanowires

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