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

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. W...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2011-10, Vol.3 (10), p.3792-3795
Main Authors: Wang, Xihua, Koleilat, Ghada I, Fischer, Armin, Tang, Jiang, Debnath, Ratan, Levina, Larissa, Sargent, Edward H
Format: Article
Language:English
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Summary: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.
ISSN:1944-8244
1944-8252
DOI:10.1021/am201097p