Air-stable n-type colloidal quantum dot solids

Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type sem...

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Published inNature materials Vol. 13; no. 8; pp. 822 - 828
Main Authors Ning, Zhijun, Voznyy, Oleksandr, Pan, Jun, Hoogland, Sjoerd, Adinolfi, Valerio, Xu, Jixian, Li, Min, Kirmani, Ahmad R., Sun, Jon-Paul, Minor, James, Kemp, Kyle W., Dong, Haopeng, Rollny, Lisa, Labelle, André, Carey, Graham, Sutherland, Brandon, Hill, Ian, Amassian, Aram, Liu, Huan, Tang, Jiang, Bakr, Osman M., Sargent, Edward H.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 01.08.2014
Nature Publishing Group
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Abstract Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO 2 . This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials. Although several techniques have been reported to obtain electron-rich colloidal quantum dots, these materials usually suffer from poor stability under air exposure. It is now shown that the use of strongly bound ligands and a careful ligands-exchange strategy lead to air-stable n-type quantum dots that can be used in solar cells and chemical sensors.
AbstractList Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO2. This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials.
Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich). Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO 2 . This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials. Although several techniques have been reported to obtain electron-rich colloidal quantum dots, these materials usually suffer from poor stability under air exposure. It is now shown that the use of strongly bound ligands and a careful ligands-exchange strategy lead to air-stable n-type quantum dots that can be used in solar cells and chemical sensors.
Author Kirmani, Ahmad R.
Carey, Graham
Li, Min
Hill, Ian
Liu, Huan
Xu, Jixian
Dong, Haopeng
Hoogland, Sjoerd
Kemp, Kyle W.
Bakr, Osman M.
Ning, Zhijun
Voznyy, Oleksandr
Sun, Jon-Paul
Minor, James
Tang, Jiang
Labelle, André
Adinolfi, Valerio
Pan, Jun
Sargent, Edward H.
Rollny, Lisa
Amassian, Aram
Sutherland, Brandon
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  organization: Division of Physical Sciences and Engineering, Solar and Photovoltaics Engineering Center, King Abdullah University of Science and Technology (KAUST)
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Snippet Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that...
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SubjectTerms 639/301/299
Air exposure
Biomaterials
Condensed Matter Physics
Electronics
Electronics industry
Energy conversion
Materials Science
Nanotechnology
Nitrogen dioxide
Optical and Electronic Materials
Oxidation
Photovoltaic cells
Quantum dots
Quantum physics
Semiconductors
Solar cells
Solar power
Solids
Solvents
Title Air-stable n-type colloidal quantum dot solids
URI https://link.springer.com/article/10.1038/nmat4007
https://www.ncbi.nlm.nih.gov/pubmed/24907929
https://www.proquest.com/docview/1557632757
Volume 13
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