Quantum-well Intermixing Process for Large Blueshifting in an Ion-implanted InGaAs/InGaAsP Multiple-quantum-well Structure Using Two-step Annealing

Abstract

We describe studies on implantation-enhanced quantum-well intermixing in a lattice-matched InGaAs/InGaAsP multiple-quantum-well p-i-n heterostructure. Samples are implanted with a dose of 5 x 10(14) P(+) ions /cm(2) at a high energy of 1 MeV. The band gaps in the samples are determined from the photoluminescence at room temperature. The Rapid Thermal Annealing (RTA) process is carried out at 675 C for 9 minutes, and the blue-shift of the band gap is as large as 107 nm. However, the band shift is improved to 140 nin when a novel two-step annealing process is conducted at 675 degrees C (9 min) and at 875 degrees C (1 min) in sequence.