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

31 Scopus citations

Abstract

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
Volume3
Issue number10
DOIs
StatePublished - Sep 27 2011
Externally publishedYes

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