Enhanced Open-Circuit Voltage in Visible Quantum Dot Photovoltaics by Engineering of Carrier-Collecting Electrodes

Xihua Wang, Ghada I. Koleilat, Armin Fischer, Jiang Tang, Ratan Debnath, Larissa Levina, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Colloidal quantum dots (CQDs) enable multijunction solar cells using a single material programmed using the quantum size effect. Here we report the systematic engineering of 1.6 eV PbS CQD solar cells, optimal as the front cell responsible for visible-wavelength harvesting in tandem photovoltaics. We rationally optimize each of the device's collecting electrodes-the heterointerface with electron-accepting TiO2 and the deep-work-function hole-collecting MoO3 for ohmic contact-for maximum efficiency. We report an open-circuit voltage of 0.70 V, the highest observed in a colloidal quantum dot solar cell operating at room temperature. We report an AM1.5 solar power conversion efficiency of 3.5%, the highest observed in >1.5 eV bandgap CQD PV device. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)3792-3795
Number of pages4
JournalACS Applied Materials & Interfaces
Issue number10
StatePublished - Sep 27 2011
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: This 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. We thank Angstrom Engineering and Innovative Technology for useful discussions regarding material deposition methods and control of glovebox environment, respectively.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.


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