Multiple exciton generation and electrical extraction from a PbSe quantum dot photoconductor

Sung Jin Kim, Won Jin Kim, Yudhisthira Sahoo, Alexander N. Cartwright, Paras N. Prasad

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Multiple exciton generation and subsequent electrical extraction from a thin film photoconductive device constructed from PbSe nanocrystal quantum dots are demonstrated. The hydrazine treatment of the PbSe film drastically improves the conductivity of the film while maintaining excellent optical and structural film quality. The effects of multiple exciton generation and electrical extraction (electrons collected per photon absorbed) were quantified as a function of incident photon energy from 1.55 to 3.1 eV. The multiple carrier extraction (>100%) was observed at photon energies greater than 2.8 times of the quantum dot bandgap with ∼210% measured at 4.4 times the bandgap.

Original languageEnglish
Article number031107
JournalApplied Physics Letters
Volume92
Issue number3
DOIs
StatePublished - Feb 1 2008
Externally publishedYes

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photoconductors
quantum dots
excitons
photons
hydrazines
nanocrystals
conductivity
energy
thin films
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Multiple exciton generation and electrical extraction from a PbSe quantum dot photoconductor. / Kim, Sung Jin; Kim, Won Jin; Sahoo, Yudhisthira; Cartwright, Alexander N.; Prasad, Paras N.

In: Applied Physics Letters, Vol. 92, No. 3, 031107, 01.02.2008.

Research output: Contribution to journalArticle

Kim, Sung Jin ; Kim, Won Jin ; Sahoo, Yudhisthira ; Cartwright, Alexander N. ; Prasad, Paras N. / Multiple exciton generation and electrical extraction from a PbSe quantum dot photoconductor. In: Applied Physics Letters. 2008 ; Vol. 92, No. 3.
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