| http://www.w3.org/ns/prov#value | - The double heterostructure comprises a N-type cladding layer of AlGaInP, an active layer of AlGaInP and a P-type cladding layer of AlGaInP. Afterwards, a transparent substrate, such as preferably glass, which is visible in the range of visible light, is adhered to the second ohmic contact layer and then the GaAs substrate is removed away.
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