Mixed-quantum-dot solar cells

Zhenyu Yang, James Z. Fan, Andrew H. Proppe, F. Pelayo García de Arquer, David Rossouw, Oleksandr Voznyy, Xinzheng Lan, Min Liu, Grant Walters, Rafael Quintero-Bermudez, Bin Sun, Sjoerd Hoogland, Gianluigi A. Botton, Shana O. Kelley and Edward H. Sargent ()
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Zhenyu Yang: University of Toronto
James Z. Fan: University of Toronto
Andrew H. Proppe: University of Toronto
F. Pelayo García de Arquer: University of Toronto
David Rossouw: McMaster University
Oleksandr Voznyy: University of Toronto
Xinzheng Lan: University of Toronto
Min Liu: University of Toronto
Grant Walters: University of Toronto
Rafael Quintero-Bermudez: University of Toronto
Bin Sun: University of Toronto
Sjoerd Hoogland: University of Toronto
Gianluigi A. Botton: McMaster University
Shana O. Kelley: University of Toronto
Edward H. Sargent: University of Toronto

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Colloidal quantum dots are emerging solution-processed materials for large-scale and low-cost photovoltaics. The recent advent of quantum dot inks has overcome the prior need for solid-state exchanges that previously added cost, complexity, and morphological disruption to the quantum dot solid. Unfortunately, these inks remain limited by the photocarrier diffusion length. Here we devise a strategy based on n- and p-type ligands that judiciously shifts the quantum dot band alignment. It leads to ink-based materials that retain the independent surface functionalization of quantum dots, and it creates distinguishable donor and acceptor domains for bulk heterojunctions. Interdot carrier transfer and exciton dissociation studies confirm efficient charge separation at the nanoscale interfaces between the two classes of quantum dots. We fabricate the first mixed-quantum-dot solar cells and achieve a power conversion of 10.4%, which surpasses the performance of previously reported bulk heterojunction quantum dot devices fully two-fold, indicating the potential of the mixed-quantum-dot approach.

Date: 2017
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DOI: 10.1038/s41467-017-01362-1

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