Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots

Jianbo Gao, Andrew F. Fidler, Victor I Klimov

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In carrier multiplication, the absorption of a single photon results in two or more electron-hole pairs. Quantum dots are promising materials for implementing carrier multiplication principles in real-life technologies. So far, however, most of research in this area has focused on optical studies of solution samples with yet to be proven relevance to practical devices. Here we report ultrafast electro-optical studies of device-grade films of electronically coupled quantum dots that allow us to observe multiplication directly in the photocurrent. Our studies help rationalize previous results from both optical spectroscopy and steady-state photocurrent measurements and also provide new insights into effects of electric field and ligand treatments on multiexciton yields. Importantly, we demonstrate that using appropriate chemical treatments of the films, extra charges produced by carrier multiplication can be extracted from the quantum dots before they are lost to Auger recombination and hence can contribute to photocurrent of practical devices.

Original languageEnglish
Article number8185
JournalNature Communications
Volume6
DOIs
Publication statusPublished - Sep 8 2015

Fingerprint

lead selenides
Quantum Dots
Photocurrents
multiplication
Semiconductor quantum dots
photocurrents
grade
quantum dots
Equipment and Supplies
Optical Devices
Photons
Genetic Recombination
Spectrum Analysis
Electric fields
Electrons
Ligands
Technology
Research
ligands
electric fields

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Carrier multiplication detected through transient photocurrent in device-grade films of lead selenide quantum dots. / Gao, Jianbo; Fidler, Andrew F.; Klimov, Victor I.

In: Nature Communications, Vol. 6, 8185, 08.09.2015.

Research output: Contribution to journalArticle

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