Show simple item record

dc.contributor.authorLiu, Mengxia
dc.contributor.authorVoznyy, Oleksandr
dc.contributor.authorSabatini, Randy
dc.contributor.authorArquer, F. Pelayo García de
dc.contributor.authorMunir, Rahim
dc.contributor.authorBalawi, Ahmed
dc.contributor.authorLan, Xinzheng
dc.contributor.authorFan, Fengjia
dc.contributor.authorWalters, Grant
dc.contributor.authorKirmani, Ahmad R.
dc.contributor.authorHoogland, Sjoerd
dc.contributor.authorLaquai, Frédéric
dc.contributor.authorAmassian, Aram
dc.contributor.authorSargent, Edward H.
dc.date.accessioned2017-01-02T09:28:29Z
dc.date.available2017-01-02T09:28:29Z
dc.date.issued2016-11-14
dc.identifier.citationLiu M, Voznyy O, Sabatini R, García de Arquer FP, Munir R, et al. (2016) Hybrid organic–inorganic inks flatten the energy landscape in colloidal quantum dot solids. Nature Materials. Available: http://dx.doi.org/10.1038/nmat4800.
dc.identifier.issn1476-1122
dc.identifier.issn1476-4660
dc.identifier.doi10.1038/nmat4800
dc.identifier.urihttp://hdl.handle.net/10754/622415
dc.description.abstractBandtail states in disordered semiconductor materials result in losses in open-circuit voltage (Voc) and inhibit carrier transport in photovoltaics. For colloidal quantum dot (CQD) films that promise low-cost, large-area, air-stable photovoltaics, bandtails are determined by CQD synthetic polydispersity and inhomogeneous aggregation during the ligand-exchange process. Here we introduce a new method for the synthesis of solution-phase ligand-exchanged CQD inks that enable a flat energy landscape and an advantageously high packing density. In the solid state, these materials exhibit a sharper bandtail and reduced energy funnelling compared with the previous best CQD thin films for photovoltaics. Consequently, we demonstrate solar cells with higher Voc and more efficient charge injection into the electron acceptor, allowing the use of a closer-to-optimum bandgap to absorb more light. These enable the fabrication of CQD solar cells made via a solution-phase ligand exchange, with a certified power conversion efficiency of 11.28%. The devices are stable when stored in air, unencapsulated, for over 1,000 h.
dc.description.sponsorshipThis publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. F.P.G.d.A. acknowledges financial support from the Connaught fund. A.H.B. and F.L. thank K. Vandewal for his contribution to the photothermal deflection spectroscopy set-up and M. Baier for help with the experiments. The authors thank E. Palmiano, L. Levina, R. Wolowiec, D. Kopilovic, G. Kim and F. Fan for their help during the course of study.
dc.publisherSpringer Nature
dc.relation.urlhttp://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat4800.html
dc.subjectQuantum dots
dc.subjectSolar cells
dc.titleHybrid organic–inorganic inks flatten the energy landscape in colloidal quantum dot solids
dc.typeArticle
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentOrganic Electronics and Photovoltaics Group
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalNature Materials
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Toronto, 10 King’s College Road, Toronto, Ontario M5S 3G4, Canada
kaust.personMunir, Rahim
kaust.personBalawi, Ahmed
kaust.personKirmani, Ahmad R.
kaust.personLaquai, Frederic
kaust.personAmassian, Aram
kaust.grant.numberKUS-11-009-21
dc.date.published-online2016-11-14
dc.date.published-print2017-02


This item appears in the following Collection(s)

Show simple item record