A Highly Efficient (12.8%) Si Nanowire Solar Cell Improved by Self-Aligned Selective Emitter  |
14-09-29 |
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9
We developed highly efficient (12.8%) nanowire solar cells by employing a self-aligned selective emitter structure without costly optical patterning. Using facile one-step etching, we obtained direct contacts between top-metal electrodes and degenerately-doped planar silicon, while concomitantly utilizing low-doped silicon nanowires as optical absorbers.This resulted in improvement of all photovoltaic parameters (Voc, Jsc, and FF) in addition to a remarkable improvement (7.0 to 60.8% at 450 nm) in the blue response in the IQE.
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A new synthetic route to hollow Co3O4 octahedra for supercapacitor applications |
14-09-29 |
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8
we developed a one-step, template-free solvothermal method to synthesize Co3O4 hollow octahedra. The hollow Co3O4 octahedra that were prepared show a good pseudocapacitance when evaluated as an electrode material for supercapacitors. In particular, the Co3O4 hollow Octahedra exhibited a higher specific capacitance than the Co3O4 nanocubes, which was attributed to lower series and diffusive resistance. A test evaluating long-term stability revealed Good cycle performance of the Co3O4 hollow octahedra.
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Photoelectrochemical water splitting employing a tapered silicon nanohole array |
14-09-29 |
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7
We demonstrated tapered SiNH photocathodes that increased the effectiveness of photoelectrochemical water splitting. Forming a refractive index gradient and alleviating the refractive index mismatch allowed for the utilization of a thin SiNH array with a depth of only 200 nm for superior light absorbance, such that the undesirable surface recombination loss could be Minimized. The larger bandgap found in the tapered SiNHs was capable of establishing a surface field for further suppression of the recombination loss by enhancing the passivation capability. The enhancement of photovoltage resulte…
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Lossless hybridization between photovoltaic and thermoelectric devices |
14-09-29 |
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6
Our theoretical and experimental results indicate that resistance matching is of significant importance for optimal operation of a hybrid circuit. Furthermore, we demonstrated that FF and voltage gains are obtained by properly selecting the internal resistance and the number of TE elements. It is also important to properly design a TE device in accordance with the J–V characteristics of selected PV cells. Otherwise, a hybrid PV-TE device may perform worse than a sole PV cell, as demonstrated in our experiments. Our theoretical and experimental study not only showed the feasibility of lossles…
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Upgraded Silicon Nanowires by Metal-Assisted Etching of Metallurgical Silicon A New Route to Nanostructured Solar-Grade Silicon |
14-09-29 |
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5
We have investigated the MaCE characteristics of MG-Si and UMG-Si for the first time. Superior purification of dirty Si was observed, from 99.74 to 99.9884% for the MG-Si powder, and from 99.999772 to 99.999899% for the UMG-Si wafer during fabricating large areas of SiNWs on their dirty mother substrates. By photo-electrochemical tests, we verified that upgraded dirty SiNWs exhibited a superior performance over their mother substrates if the surface recombination was well controlled. Our approaches open a new way for upgrading MG-Si to solar grade, and have a great potential to reduce th…
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