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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Levander, A. X.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2013Local structure of amorphous GaN1-xAsx semiconductor alloys across the composition rangecitations
- 2013Microstructure of Mg doped GaNAs alloyscitations
- 2012Structural studies of GaN 1-x As x and GaN 1-x Bi x alloys for solar cell applicationscitations
- 2011GaNAs alloys over the whole composition range grown on crystalline and amorphous substratescitations
- 2010GaN1-xBixcitations
- 2010Low gap amorphous GaN1-x Asx alloys grown on glass substratecitations
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article
Structural studies of GaN 1-x As x and GaN 1-x Bi x alloys for solar cell applications
Abstract
We have discovered materials with a wide tunability of the band gap that opens the possibility to achieve a desirable material for multi-junction solar cells. Two different alloy systems have been studied. GaN <sub>1-x</sub>As <sub>x</sub> alloys over the entire composition range were grown by plasma-assisted MBE at low temperature on crystalline and amorphous (glass) substrates. For growth on sapphire the alloys are amorphous in the composition range of 0.171-xAs <sub>x</sub> alloys ranges from 3.4-0.7 eV, covering a large part of the solar spectrum, therefore this material is potentially useful for solar energy conversion. The substitution of N by Bi in GaN forming GaN <sub>1-x</sub> Bi <sub>x</sub> is extremely difficult since Bi and N have even larger differences in size and electronegativity. TEM studies of GaN <sub>1-x</sub>Bi <sub>x</sub> with x up to 0.2 show that the alloy is not entirely amorphous. Small crystallites embedded in an amorphous matrix are observed and Bi segregation was confirmed by Electron Energy Loss studies. A strong reduction in band gap is observed in samples with increasing Bi, suggesting the formation of a random alloy but low energy absorption tail may be related to the presence of the crystallites observed by TEM. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.