Patent ID: 6744078
Filing Date: 2004-06-01
Classification: H01L

Abstract:
A thin film crystal wafer with pn-junction comprising a first layer of a first conductivity type which is a 3-5 group compound semiconductor represented by a general formula: InxGayAlzP (0&lE;x&lE;1, 0&lE;y&lE;1, 0&lE;z&lE;, x+y+z=1), and the second layer of the first conductivity type which is a 3-5 group compound semiconductor represented by a general formula: InxGayAlZAs (0&lE;x&lE;1, 0&lE;y&lE;1, 0&lE;z&lE;1, x+y+z=1), said second layer being made above said first layer, and at a heterojunction interface formed between said first layer and said second layer, further comprising a charge compensation layer of a first conductivity type with an impurity concentration higher than that of said first and second layers, and the thickness of said charge compensation layer is not less than 1 nm and not more than 15 nm;wherein a carrier concentration and thickness of said charge compensation layer are controlled depending on a bandgap energy of said first layer.