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We propose a novel alloy system of oxide semiconductors promising for unique multifunctions, the corundum structured Ga2O3‐Cr2O3‐Fe2O3 alloys on sapphire substrates. With this system the optical band gap can be widely tuned from 2.2 to 5.3 eV while keeping the acceptable lattice mismatch. A key issue was to fabricate α‐Ga2O3 thin films, which has been recognized as a sub‐stable phase and there is...
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