A Donor-Supply Electrode (DSE) for Colloidal Quantum Dot Photovoltaics

Handle URI:
http://hdl.handle.net/10754/597257
Title:
A Donor-Supply Electrode (DSE) for Colloidal Quantum Dot Photovoltaics
Authors:
Koleilat, Ghada I.; Wang, Xihua; Labelle, Andre J.; Ip, Alexander H.; Carey, Graham H.; Fischer, Armin; Levina, Larissa; Brzozowski, Lukasz; Sargent, Edward H.
Abstract:
The highest-performing colloidal quantum dot (CQD) photovoltaics (PV) reported to date have relied on high-temperature (>500°C) annealing of electron-accepting TiO 2. Room-temperature processing reduces energy payback time and manufacturing cost, enables flexible substrates, and permits tandem solar cells that integrate a small-bandgap back cell atop a low-thermal-budget larger-bandgap front cell. Here we report an electrode strategy that enables a depleted-heterojunction CQD PV device to be fabricated entirely at room temperature. We find that simply replacing the high-temperature-processed TiO 2 with a sputtered version of the same material leads to poor performance due to the low mobility of the sputtered oxide. We develop instead a two-layer donor-supply electrode (DSE) in which a highly doped, shallow work function layer supplies a high density of free electrons to an ultrathin TiO 2 layer via charge-transfer doping. Using the DSE we build all-room-temperature-processed small-bandgap (1 eV) colloidal quantum dot solar cells having 4% solar power conversion efficiency and high fill factor. These 1 eV bandgap cells are suitable for use as the back junction in tandem solar cells. The DSE concept, combined with control over TiO 2 stoichiometry in sputtering, provides a much-needed tunable electrode to pair with quantum-size-effect CQD films. © 2011 American Chemical Society.
Citation:
Koleilat GI, Wang X, Labelle AJ, Ip AH, Carey GH, et al. (2011) A Donor-Supply Electrode (DSE) for Colloidal Quantum Dot Photovoltaics. Nano Lett 11: 5173–5178. Available: http://dx.doi.org/10.1021/nl202337a.
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
KAUST Grant Number:
KUS-11-009-21
Issue Date:
14-Dec-2011
DOI:
10.1021/nl202337a
PubMed ID:
22084839
Type:
Article
ISSN:
1530-6984; 1530-6992
Sponsors:
This publication is based in part on work supported by an award (no. KUS-11-009-21) made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, by the Natural Sciences and Engineering Research Council (NSERC) of Canada, and by Angstrom Engineering and Innovative Technology. The authors would also like to acknowledge the assistance of Ratan Debnath, Huan Liu, Elenita Palmiano, Remigiusz Wolowiec, and Damir Kopilovic as well as the assistance of Mark T. Greiner with UPS/XPS measurement. G.I.K. acknowledges NSERC support in the form of Alexander Graham Bell Canada Graduate Scholarship.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorKoleilat, Ghada I.en
dc.contributor.authorWang, Xihuaen
dc.contributor.authorLabelle, Andre J.en
dc.contributor.authorIp, Alexander H.en
dc.contributor.authorCarey, Graham H.en
dc.contributor.authorFischer, Arminen
dc.contributor.authorLevina, Larissaen
dc.contributor.authorBrzozowski, Lukaszen
dc.contributor.authorSargent, Edward H.en
dc.date.accessioned2016-02-25T12:29:08Zen
dc.date.available2016-02-25T12:29:08Zen
dc.date.issued2011-12-14en
dc.identifier.citationKoleilat GI, Wang X, Labelle AJ, Ip AH, Carey GH, et al. (2011) A Donor-Supply Electrode (DSE) for Colloidal Quantum Dot Photovoltaics. Nano Lett 11: 5173–5178. Available: http://dx.doi.org/10.1021/nl202337a.en
dc.identifier.issn1530-6984en
dc.identifier.issn1530-6992en
dc.identifier.pmid22084839en
dc.identifier.doi10.1021/nl202337aen
dc.identifier.urihttp://hdl.handle.net/10754/597257en
dc.description.abstractThe highest-performing colloidal quantum dot (CQD) photovoltaics (PV) reported to date have relied on high-temperature (>500°C) annealing of electron-accepting TiO 2. Room-temperature processing reduces energy payback time and manufacturing cost, enables flexible substrates, and permits tandem solar cells that integrate a small-bandgap back cell atop a low-thermal-budget larger-bandgap front cell. Here we report an electrode strategy that enables a depleted-heterojunction CQD PV device to be fabricated entirely at room temperature. We find that simply replacing the high-temperature-processed TiO 2 with a sputtered version of the same material leads to poor performance due to the low mobility of the sputtered oxide. We develop instead a two-layer donor-supply electrode (DSE) in which a highly doped, shallow work function layer supplies a high density of free electrons to an ultrathin TiO 2 layer via charge-transfer doping. Using the DSE we build all-room-temperature-processed small-bandgap (1 eV) colloidal quantum dot solar cells having 4% solar power conversion efficiency and high fill factor. These 1 eV bandgap cells are suitable for use as the back junction in tandem solar cells. The DSE concept, combined with control over TiO 2 stoichiometry in sputtering, provides a much-needed tunable electrode to pair with quantum-size-effect CQD films. © 2011 American Chemical Society.en
dc.description.sponsorshipThis publication is based in part on work supported by an award (no. KUS-11-009-21) made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, by the Natural Sciences and Engineering Research Council (NSERC) of Canada, and by Angstrom Engineering and Innovative Technology. The authors would also like to acknowledge the assistance of Ratan Debnath, Huan Liu, Elenita Palmiano, Remigiusz Wolowiec, and Damir Kopilovic as well as the assistance of Mark T. Greiner with UPS/XPS measurement. G.I.K. acknowledges NSERC support in the form of Alexander Graham Bell Canada Graduate Scholarship.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcharge-transfer dopingen
dc.subjectDonor-supply electrodeen
dc.subjectelectron injectionen
dc.subjectroomtemperature processingen
dc.subjectsolution-processed photovoltaicsen
dc.titleA Donor-Supply Electrode (DSE) for Colloidal Quantum Dot Photovoltaicsen
dc.typeArticleen
dc.identifier.journalNano Lettersen
dc.contributor.institutionUniversity of Toronto, Toronto, Canadaen
kaust.grant.numberKUS-11-009-21en

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