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

doi:10.1021/am201097p

Enhanced open-circuit voltage in visible quantum dot photovoltaics by engineering of carrier-collecting electrodes

ACS Appl Mater Interfaces. 2011 Oct;3(10):3792-5. doi: 10.1021/am201097p. Epub 2011 Sep 27.

Authors

Xihua Wang¹, Ghada I Koleilat, Armin Fischer, Jiang Tang, Ratan Debnath, Larissa Levina, Edward H Sargent

Affiliation

¹ Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

PMID: 21936534
DOI: 10.1021/am201097p

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 TiO(2) and the deep-work-function hole-collecting MoO(3) 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.

Publication types

Research Support, Non-U.S. Gov't