Efficient hybrid colloidal quantum dot/organic solar cells mediated by near-infrared sensitizing small molecules

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Solution-processed semiconductors are promising materials to realize optoelectronic devices that combine high performance with inexpensive manufacturing. In particular, the exploitation of colloidal quantum dots (CQDs) capable of harvesting infrared photons, in conjunction with visible-absorbing organic chromophores, has been demonstrated as an interesting route. Unfortunately, CQD/organic hybrid photovoltaics have been limited to power conversion efficiencies (PCEs) below 10% due to chemical mismatch and difficulties in facilitating charge collection. Here we devise a hybrid architecture that overcomes these limitations by introducing small molecules into the CQD/organic stacked structure. The small molecule complements CQD absorption and creates an exciton cascade with the host polymer, thus enabling efficient energy transfer and also promoting exciton dissociation at heterointerfaces. The resulting hybrid solar cells exhibit PCEs of 13.1% and retain over 80% of their initial PCE after 150 h of continuous operation unencapsulated, outperforming present air-processed solution-cast CQD/organic photovoltaics.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2019-11
Language
English
Article Type
Article
Citation

NATURE ENERGY, v.4, no.11, pp.969 - 976

ISSN
2058-7546
DOI
10.1038/s41560-019-0492-1
URI
http://hdl.handle.net/10203/268862
Appears in Collection
EEW-Journal Papers(저널논문)
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