Heterojunction photovoltaics using printed colloidal quantum dots as a photosensitive layer

Publication Type:

Journal Article

Source:

Nano Lett., ACS Publications, Volume 9, Issue 2, p.860-863 (2009)

ISBN:

1530-6984

Keywords:

2009, 2013 and earlier

Abstract:

We demonstrate a bilayer photovoltaic device consisting of a heterojunction between colloidal cadmium selenide (CdSe) quantum dots
(QDs) and a wide band gap organic hole-transporting thin film of
N,N'-diphenyl-N,N'-bis(3-methylphenyl)[1,1'-biphenyl]-4,4'-diamine (TPD)
molecules. The active light-absorbing film of QDs is nondestructively
printed onto TPD using microcontact stamping. Indium-tin-oxide (ITO)
provides the top contact. The resulting device structure can accommodate
different size QDs, produces an exceptionally large open circuit voltage
(0.8 V) for an architecture with symmetric electrodes, and yields an
internal quantum efficiency of 10% at the first QD absorption peak.