Display options
Cite
Sukhovatkin V, Hinds S, Brzozowski L, et al. Colloidal quantum-dot photodetectors exploiting multiexciton generation. Science. 2009;324(5934):1542-4doi: 10.1126/science.1173812.
Sukhovatkin, V., Hinds, S., Brzozowski, L., & Sargent, E. H. (2009). Colloidal quantum-dot photodetectors exploiting multiexciton generation. Science (New York, N.Y.), 324(5934), 1542-4. https://doi.org/10.1126/science.1173812
Sukhovatkin, Vlad, et al. "Colloidal quantum-dot photodetectors exploiting multiexciton generation." Science (New York, N.Y.) vol. 324,5934 (2009): 1542-4. doi: https://doi.org/10.1126/science.1173812
Sukhovatkin V, Hinds S, Brzozowski L, Sargent EH. Colloidal quantum-dot photodetectors exploiting multiexciton generation. Science. 2009 Jun 19;324(5934):1542-4. doi: 10.1126/science.1173812. PMID: 19541992.
Copy Download .nbib Format: NLM
Share it on

Science. 2009 Jun 19;324(5934):1542-4. doi: 10.1126/science.1173812.

Colloidal quantum-dot photodetectors exploiting multiexciton generation.

Science (New York, N.Y.)

Vlad Sukhovatkin, Sean Hinds, Lukasz Brzozowski, Edward H Sargent

Affiliations

  1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 3G4, Canada.

PMID: 19541992 DOI: 10.1126/science.1173812

Abstract

Multiexciton generation (MEG) has been indirectly observed in colloidal quantum dots, both in solution and the solid state, but has not yet been shown to enhance photocurrent in an optoelectronic device. Here, we report a class of solution-processed photoconductive detectors, sensitive in the ultraviolet, visible, and the infrared, in which the internal gain is dramatically enhanced for photon energies Ephoton greater than 2.7 times the quantum-confined bandgap Ebandgap. Three thin-film devices with different quantum-confined bandgaps (set by the size of their constituent lead sulfide nanoparticles) show enhancement determined by the bandgap-normalized photon energy, Ephoton/Ebandgap, which is a clear signature of MEG. The findings point to a valuable role for MEG in enhancing the photocurrent in a solid-state optoelectronic device. We compare the conditions on carrier excitation, recombination, and transport for photoconductive versus photovoltaic devices to benefit from MEG.

Publication Types