Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5471-5476Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203235u
Keywords
Quantum dots; photoconductivity; carrier dynamics; carrier cooling; optoelectronic materials; photovoltaics
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Funding
- 3TU Centre for Sustainable Energy Technologies (Federation of the Three Universities of Technology in The Netherlands)
- SenterNovem
- Dutch Ministry of Economic Affairs, Agriculture and Innovation
- Netherlands Organisation for Scientific Research (NWO) through NWO-VENI
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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.
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