Jianbo Gao1

1, Clemson University, Clemson, South Carolina, United States

Quantum dot devices have wide applications in photovoltaics, optoelectronics, and sensors due to quantum dot unique quantum confinement effect, which can be tailed by size, shape, structure, and composition. Therefore, the ultrafast photophysics dynamics of charge carrier in situ devices (electrons, holes, or ions) including carrier transport, injection through optical or electrical, recombination, trapping, and transfer is one of the most fundamental questions.

We developed ultrafast photocurrent spectroscopy and ultrafast electroluminescence spectroscopy to address the ultrafast carrier dynamics in situ devices including solar cells, single-photon detectors, light emitting diodes, and photodetectors. In addition to that we understand ultrafast carrier transport and recombination dynamics, we discover novel photoconductivity phenomena, which cannot be addressed by other laser pump-probe spectroscopies.