重p型掺杂GaAsSb广泛应用于InP HBT基区材料, 重掺杂影响GaAsSb材料的带隙和费米能级等重要参数, 这些参数对设计高性能HBT起着关键作用。本文通过间接跃迁模型研究了p+-GaAsSb材料的荧光性质, 以及费米能级与Sb组分的关系。由于费米能级与空穴有效质量mh和空穴态密度nh存在函数关系, 我们通过荧光测量并计算了空穴有效质量mh和空穴态密度nh,研究结果表明mh和nh共同主导了费米能级的变化。

Heavily p+-doped GaAsSb is extensively applied in InP HBT base material, it influences many important parameters, such as band gap and Fermi level. These parameters are key factors for the design of high performance HBT devices. This work studied photoluminescence of p+- GaAsSb in the model of indirect transition, especially the relationship between GaAsSb Fermi level and Sb composition. The hole effective mass (mh) and hole density (nh) were measured and calculated because Fermi level, mh and nh had functional relationship. It is found that mh and nh result in the change of Fermi level.