Patent ID: 7176480

Claim:
A method of creating an active layer of quantum well structure on a semiconductor layer of a prescribed conductivity type in a light-emitting semiconductor device, the method comprising the steps of: (a) forming a barrier sublayer on the semiconductor layer by organometallic chemical vapor deposition, the barrier sublayer being of In y Ga 1-y N where the subscript y is a numeral that is greater than zero and equal to or less than 0.5; (b) forming a first complementary sublayer on the barrier sublayer by organometallic chemical vapor deposition, the first complementary sublayer being of Al a Ga b In 1-a-b N where the subscript a is a numeral that is greater than zero; the subscript b is a numeral that is less than one; and the sum of a and b is equal to or less than one; (c) forming a well sublayer on the first complementary sublayer by organometallic chemical vapor deposition, the well sublayer being of In x Ga 1-x N where the subscript x is a numeral that is greater than zero, equal to or less than 0.5, and greater than y in the formula defining materials for the barrier sublayer; (d) forming a second complementary sublayer on the well sublayer by organometallic chemical vapor deposition, the second complementary sublayer being of Al a′ Ga b′ In 1-a′-b′ N where the subscript a′ is a numeral that is greater than zero; the subscript b′ is a numeral that is less than one; and the sum of a′ and b′ is equal to or less than one; (e) forming another barrier sublayer on the second complementary sublayer by organometallic chemical vapor deposition, the second recited barrier sublayer being of In y Ga 1-y N where the subscript y is a numeral that is greater than zero and equal to or less than 0.5.