“…In early work on C-InAlAs, Ito and Ougazzaden used the extremely low growth temperature (T g ) of 530 1C [7,8]. Following this, several groups [9,10] have investigated the electrical characteristics of the C-InAlAs and found that a low T g (o575 1C) is necessary to keep the ptype carrier concentration. We have also demonstrated that the carbon concentration increases with decrease in T g , and have successfully achieved a p-doping over 1 Â 10 18 cm À3 at the higher T g of 580 1C [11].…”