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

Type
Article

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

KAUST Grant Number
KUS-11-009-21

Online Publication Date
2011-09-27

Print Publication Date
2011-10-26

Date
2011-09-27

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.

Citation
Wang X, Koleilat GI, Fischer A, Tang J, Debnath R, et al. (2011) Enhanced Open-Circuit Voltage in Visible Quantum Dot Photovoltaics by Engineering of Carrier-Collecting Electrodes. ACS Applied Materials & Interfaces 3: 3792–3795. Available: http://dx.doi.org/10.1021/am201097p.

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.

Publisher
American Chemical Society (ACS)

Journal
ACS Applied Materials & Interfaces

DOI
10.1021/am201097p

PubMed ID
21936534

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