Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots

Physical Chemistry Chemical Physics : PCCP
Jianhui SunYasuaki Masumoto

Abstract

Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots (CIS QDs) was studied by means of femtosecond transient-absorption (TA) and nanosecond time-resolved photoluminescence (PL) spectroscopy. Under strong excitation, the TA dynamics in CIS QDs is well described by a simple rate equation including single-carrier trapping, free-to-bound recombination, and trap-assisted Auger recombination. Under weak excitation, on the other hand, the PL decays of the QDs are composed of a short-lived component caused by surface trapping and a long-lived one caused by free-to-bound recombination. It is found that the surface trapping accelerates markedly with decreasing QD size while the free-to-bound radiative recombination hardly depends on the QD size. Besides this, we observed both a decrease in the PL lifetimes and a dynamic spectral redshift, which are attributed to the surface trapping and the coexistent inhomogeneous broadening in CIS QDs. The spectral redshift becomes less pronounced in CIS/ZnS core/shell QDs because of the suppression of the fast nonradiative recombination caused by the passivation of the surface traps. These results give clear evidence that the free-to-bound model is appropriate for interpreti...Continue Reading

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Citations

Apr 5, 2016·The Journal of Physical Chemistry Letters·Danilo H JaraPrashant V Kamat
Apr 28, 2016·ACS Applied Materials & Interfaces·Dae-Yeon JoHeesun Yang
Feb 2, 2021·The Journal of Physical Chemistry Letters·Swarnali GhoshPrasun K Mandal
Jan 21, 2021·Nanomaterials·Vera KuznetsovaYurii Gun'ko
Aug 26, 2020·ACS Applied Materials & Interfaces·Annette DelicesKuntheak Kheng
Aug 2, 2017·The Journal of Physical Chemistry Letters·Arianna MarchioroDaniel R Gamelin
Mar 22, 2018·Inorganic Chemistry·Mohamad S KodaimatiEmily A Weiss
Nov 19, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Adam OlejniczakBartłomiej Cichy

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