Size Distribution Effects on Mobility and Intraband Gap of HgSe Quantum Dots

Menglu Chen, Guohua Shen, Philippe Guyot-Sionnest*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)
Plum Print visual indicator of research metrics
  • Citations
    • Citation Indexes: 31
  • Captures
    • Readers: 43
see details

Abstract

In this work, we investigate the effect of size distribution on the mobility, the conductivity gap, and the intraband photoconduction of HgSe colloidal quantum dots (CQDs). Using electrochemistry, we measure the mobility for a series of ethandithiol cross-linked n-doped HgSe quantum dot films with different size distribution but a similar average size. The results show that mobility is exponentially dependent on size dispersion. This is interpreted as the size dispersion causing an increase in the average activation energy for hopping transport and the effect is reproduced by a model and a simulation. Comparing with the interband HgTe where the optical gap is between the valence and the conduction band, the conductivity gap in n-doped HgSe between the 1Se and 1Pe states is more strongly softened by the size distribution. This harms the intraband photoconductive properties and it implies that improved size distribution will be needed when using intraband photodetectors.

Original languageEnglish
Pages (from-to)16216-16221
Number of pages6
JournalJournal of Physical Chemistry C
Volume124
Issue number29
DOIs
Publication statusPublished - 23 Jul 2020
Externally publishedYes

Fingerprint

Dive into the research topics of 'Size Distribution Effects on Mobility and Intraband Gap of HgSe Quantum Dots'. Together they form a unique fingerprint.

Cite this

Chen, M., Shen, G., & Guyot-Sionnest, P. (2020). Size Distribution Effects on Mobility and Intraband Gap of HgSe Quantum Dots. Journal of Physical Chemistry C, 124(29), 16216-16221. https://doi.org/10.1021/acs.jpcc.0c05268