Enhanced Hot-Carrier Cooling and Ultrafast Spectral Diffusion in Strongly Coupled PbSe Quantum-Dot Solids
Nano Letters2011Vol. 11(12), pp. 5471–5476
Citations Over TimeTop 10% of 2011 papers
Yunan Gao, Elise Talgorn, Michiel Aerts, M. Tuan Trinh, Juleon M. Schins, Arjan J. Houtepen, Laurens D. A. Siebbeles
Abstract
PbSe quantum-dot solids are of great interest for low cost and efficient photodetectors and solar cells. We have prepared PbSe quantum-dot solids with high charge carrier mobilities using layer-by-layer dip-coating with 1,2-ethanediamine as substitute capping ligands. Here we present a time and energy resolved transient absorption spectroscopy study on the kinetics of photogenerated charge carriers, focusing on 0-5 ps after photoexcitation. We compare the observed carrier kinetics to those for quantum dots in dispersion and show that the intraband carrier cooling is significantly faster in quantum-dot solids. In addition we find that carriers diffuse from higher to lower energy sites in the quantum-dot solid within several picoseconds.
Related Papers
- → Picosecond relaxation of hot carriers in highly photoexcited bulk GaAs and GaAs-AlGaAs multiple quantum wells(1984)129 cited
- → Picosecond structural relaxation of S1 trans-stilbene in solution as revealed by time-resolved Raman spectroscopy(1992)75 cited
- → Picosecond photoexcitation dynamics in poly(3-butyl-thiophene) films(1998)10 cited
- → Effects of local photoexcitation of high-concentration charge carriers in silicon(2017)1 cited
- → Femtosecond Vibrational Spectroscopic Study on Photoexcitation Dynamics of DNO-bound Myoglobin(2014)