Fig. 1
From: Observation of a phonon bottleneck in copper-doped colloidal quantum dots
Suppression of hot electron cooling in Cu-doped QDs. a In typical QDs, hot electrons relax on a sub-ps timescale through an Auger-like process whereby the electron relaxation energy is used to excite the hole in the valence band, denoted as process (i). b In Cu:QDs, ultrafast hole capturing (ii) by the intragap copper states (Cu*) decouples electrons and holes, thus suppressing Auger cooling of electrons and enabling a phonon bottleneck for hot electrons
