Abstract
The study of multiexcitons in colloidal quantum dots (CQDs) is a timely topic, as these multiexcitons have practical applications in gain devices, photovoltaic cells and as single photon light sources. However, these excitons decay primarily via nonradiative Auger relaxation at a time scale of 10-100 ps, due to the enhancement of many-body interactions inside dots with a typical diameter of 3-4 nm surrounded by low dielectric medium. Despite the predicted limitations, the present study unambiguously showed an emission of neutral biexciton (BX), triexciton (TX) and quandraexciton (QX) in a time-integrated micro-photoluminescence (μ-PL) spectrum of quasi-type II CdTe/CdSe CQDs. These CQDs offer the option of Auger relaxation suppression and an extension of multiexcitons’ lifetime. This upturn should permit charge extraction in photovoltaic cells and inversion of population in a gain device.
© 2009 Optical Society of America
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