Engineering colloidal quantum dot solids within and beyond the mobility-invariant regime

David Zhitomirsky, Oleksandr Voznyy, Larissa Levina, Sjoerd Hoogland, Kyle W. Kemp, Alexander H. Ip, Susanna M. Thon and Edward H. Sargent ()
Additional contact information
David Zhitomirsky: University of Toronto
Oleksandr Voznyy: University of Toronto
Larissa Levina: University of Toronto
Sjoerd Hoogland: University of Toronto
Kyle W. Kemp: University of Toronto
Alexander H. Ip: University of Toronto
Susanna M. Thon: Johns Hopkins University
Edward H. Sargent: University of Toronto

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Colloidal quantum dots are attractive materials for efficient, low-cost and facile implementation of solution-processed optoelectronic devices. Despite impressive mobilities (1–30 cm2 V−1 s−1) reported for new classes of quantum dot solids, it is—surprisingly—the much lower-mobility (10−3–10−2 cm2 V−1 s−1) solids that have produced the best photovoltaic performance. Here we show that it is not mobility, but instead the average spacing among recombination centres that governs the diffusion length of charges in today’s quantum dot solids. In this regime, colloidal quantum dot films do not benefit from further improvements in charge carrier mobility. We develop a device model that accurately predicts the thickness dependence and diffusion length dependence of devices. Direct diffusion length measurements suggest the solid-state ligand exchange procedure as a potential origin of the detrimental recombination centres. We then present a novel avenue for in-solution passivation with tightly bound chlorothiols that retain passivation from solution to film, achieving an 8.5% power conversion efficiency.

Date: 2014
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/ncomms4803 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4803

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms4803

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().