Multiexcitons in Colloidal Semiconductor Nanocrystals

• DOI: 10.1364/iqec.2009.ifa2
• Publication Date: 2013-04-15T18:16:33Z
• Authors: Ruth Osovsky; Dima Cheskis; Viki Kloper; Leonid Fradkin; Aldona Sashchiuk; Martin Kroner; Efrat Lifshitz

The study of multiexcitons in colloidal quantum dots (CQDs) is a timely topic, as these have practical applications gain devices, photovoltaic cells and single photon light sources. However, excitons decay primarily via nonradiative Auger relaxation at time scale 10-100 ps, due to the enhancement many-body interactions inside with typical diameter 3-4 nm surrounded by low dielectric medium. Despite predicted limitations, present unambiguously showed an emission neutral biexciton (BX), triexciton (TX) quandraexciton (QX) time-integrated micro-photoluminescence (μ-PL) spectrum quasi-type II CdTe/CdSe CQDs. These CQDs offer option suppression extension multiexcitons' lifetime. This upturn should permit charge extraction inversion population device.