Solar-blind wurtzite MgZnO alloy films stabilized by Be doping

Author： Su Longxing   Zhu Yuan   Zhang Quanlin   Chen Mingming   Ji Xu   Wu Tianzhun   Gui Xuchun   Pan Bicai   Xiang Rong   Tang Zikang  

Publisher： IOP Publishing

ISSN： 0022-3727

Source： Journal of Physics D: Applied Physics, Vol.46, Iss.24, 2013-06, pp. : 245103-245106

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Abstract

MgxZn1−xO alloy films were deposited on c-plane sapphire substrates by radio frequency plasma-assisted molecular beam epitaxy (rf-PMBE). The phase segregation occurred when x was larger than 33%. Be doping was found experimentally able to stabilize the high-Mg-content MgZnO alloy. By alloying 1-2% Be into MgZnO, the band gap of as-prepared quaternary alloys can be raised to the solar-blind range (4.5 eV). Calculated formation energy of the alloys based on first principle reveals that a small amount of Be incorporation can reduce the formation energy of high-Mg-content MgZnO alloys and results in a more stable system, which justifies our experimental observations.

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