Pelton, MatthewIthurria, SandrineSchaller, Richard D.Dolzhnikov, Dmitriy S.Talapin, Dmitri V.2023-08-112023-08-112012-11-08Pelton, Matthew, Sandrine Ithurria, Richard D. Schaller, Dmitriy S. Dolzhnikov, and Dmitri V. Talapin. “Carrier Cooling in Colloidal Quantum Wells.” Nano Letters 12, no. 12 (December 12, 2012): 6158–63. https://doi.org/10.1021/nl302986y.https://doi.org/10.1021/nl302986yhttp://hdl.handle.net/11603/29184It has recently become possible to chemically synthesize atomically flat semiconductor nanoplatelets with monolayer-precision control over the platelet thickness. It has been suggested that these platelets are quantum wells; that is, carriers in these platelets are confined in one dimension but are free to move in the other two dimensions. Here, we report time-resolved photoluminescence and transient-absorption measurements of carrier relaxation that confirm the quantum-well nature of these nanomaterials. Excitation of the nanoplatelets by an intense laser pulse results in the formation of a high-temperature carrier population that cools back down to ambient temperature on the time scale of several picoseconds. The rapid carrier cooling indicates that the platelets are well-suited for optoelectronic applications such as lasers and modulators.6 pagesen-USThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Public Domain Mark 1.0http://creativecommons.org/publicdomain/mark/1.0/Text