Transient Parameter Extraction Methods

Semiconductor traps or impurity states, interface states, or defects, play a crucial role in the performance and reliability of semiconductor devices. Understanding semiconductor traps is essential for optimizing device performance, enhancing device reliability, and improving the efficiency and functionality of new materials, particularly in optoelectronic devices. This chapter explores the significance of characterizing these traps, which are introduced into the crystal lattice through intentional or unintentional doping. It is seen that the method of determining traps has remained unchanged over the last decade, although there are important studies that require specific mention in this chapter. Furthermore, it becomes evident in this chapter that the ideal characterization technique should be sensitive, rapid, and analytically straightforward, capable of differentiating between majority- and minority-carrier traps. Spectroscopic capabilities for distinguishing signals from different traps, along with reproducible plotting, are crucial. Additionally, the method should assess traps at various depths, encompassing both radiative and nonradiative centers. Luminescence spectroscopy is effective for investigating shallow centers, while more sophisticated techniques are required for deeper nonradiative recombination centers, which often dominate recombination kinetics in many devices.