Study of Temperature Dependent Recombination Mechanisms and Carrier Lifetime in Quantum Dots

In this thesis, we have established a time-resolved system for measuring the carrier lifetimes of quantum dots.irstly, we have studied the recombination mechanism of quantum dots by using the excitation power dependent photoluminescence measurement. It has been demonstrated that the free-carrier recombination is the dominant mechanism at room temperature. The influence of exciton becomes larger when the temperature is decreased.hen, in order to verify this time-resolved system, a time- correlated single photon counting (TCSPC) system has been established. By comparing the result obtained by TCSPC system, the validity of our time-resolved system is confirmed.urthermore, we investigated the temperature dependent carrier lifetimes. It has been shown that the carrier lifetime first increases and then decreases with increasing temperature.