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      Improvement of Short-Circuit Current Density in p-\(\text{N}{\text{i}}_{1-x}\)O:Li/n-Si Heterojunction Solar Cells by Wet Chemical Etching

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      Journal of Nanomaterials
      Hindawi Limited

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          Abstract

          This study confirms that the surface texturation of window layer (Al-Y codoped ZnO) etched by diluted HCl effectively increases conversion efficiency of p- Ni 1−x O:Li/n-Si heterojunction solar cells. The results show that the short circuit current density ( J sc ) of cell etched at 10 s increases about 8.5% compared to unetched cell, which also corresponds to the increase of efficient photoelectric conversion in NIR region as shown in external quantum efficiency spectra. It is attributed to the increase of light transmittance of AZOY thin films in the NIR region and the effective light path of the NIR wavelength, which results in increasing of light absorption in the base layer.

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          Nanodome solar cells with efficient light management and self-cleaning.

          Here for the first time, we demonstrate novel nanodome solar cells, which have periodic nanoscale modulation for all layers from the bottom substrate, through the active absorber to the top transparent contact. These devices combine many nanophotonic effects to both efficiently reduce reflection and enhance absorption over a broad spectral range. Nanodome solar cells with only a 280 nm thick hydrogenated amorphous silicon (a-Si:H) layer can absorb 94% of the light with wavelengths of 400-800 nm, significantly higher than the 65% absorption of flat film devices. Because of the nearly complete absorption, a very large short-circuit current of 17.5 mA/cm(2) is achieved in our nanodome devices. Excitingly, the light management effects remain efficient over a wide range of incident angles, favorable for real environments with significant diffuse sunlight. We demonstrate nanodome devices with a power efficiency of 5.9%, which is 25% higher than the flat film control. The nanodome structure is not in principle limited to any specific material system and its fabrication is compatible with most solar manufacturing; hence it opens up exciting opportunities for a variety of photovoltaic devices to further improve performance, reduce materials usage, and relieve elemental abundance limitations. Lastly, our nanodome devices when modified with hydrophobic molecules present a nearly superhydrophobic surface and thus enable self-cleaning solar cells.
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            TCO and light trapping in silicon thin film solar cells

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              The effect of front ZnO:Al surface texture and optical transparency on efficient light trapping in silicon thin-film solar cells

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                Author and article information

                Journal
                Journal of Nanomaterials
                Journal of Nanomaterials
                Hindawi Limited
                1687-4110
                1687-4129
                2014
                2014
                : 2014
                :
                : 1-7
                Article
                10.1155/2014/104136
                53df390b-d75b-4195-8f55-644da627a787
                © 2014

                http://creativecommons.org/licenses/by/3.0/

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