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2015 ; 6
(ä): 8185
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Carrier multiplication detected through transient photocurrent in device-grade
films of lead selenide quantum dots
#MMPMID26345390
Gao J
; Fidler AF
; Klimov VI
Nat Commun
2015[Sep]; 6
(ä): 8185
PMID26345390
show ga
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.