Cascade surface modification of colloidal quantum dot inks enables efficient bulk homojunction photovoltaics

Min-Jae Choi, F. Pelayo García de Arquer, Andrew H. Proppe, Ali Seifitokaldani, Jongmin Choi, Junghwan Kim, Se-Woong Baek, Mengxia Liu, Bin Sun, Margherita Biondi, Benjamin Scheffel, Grant Walters, Dae-Hyun Nam, Jea Woong Jo, Olivier Ouellette, Oleksandr Voznyy, Sjoerd Hoogland, Shana O. Kelley, Yeon Sik Jung () and Edward. H. Sargent ()
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Min-Jae Choi: University of Toronto
F. Pelayo García de Arquer: University of Toronto
Andrew H. Proppe: University of Toronto
Ali Seifitokaldani: University of Toronto
Jongmin Choi: University of Toronto
Junghwan Kim: University of Toronto
Se-Woong Baek: University of Toronto
Mengxia Liu: University of Toronto
Bin Sun: University of Toronto
Margherita Biondi: University of Toronto
Benjamin Scheffel: University of Toronto
Grant Walters: University of Toronto
Dae-Hyun Nam: University of Toronto
Jea Woong Jo: University of Toronto
Olivier Ouellette: University of Toronto
Oleksandr Voznyy: University of Toronto
Sjoerd Hoogland: University of Toronto
Shana O. Kelley: University of Toronto
Yeon Sik Jung: Korea Advanced Institute of Science and Technology (KAIST)
Edward. H. Sargent: University of Toronto

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Control over carrier type and doping levels in semiconductor materials is key for optoelectronic applications. In colloidal quantum dots (CQDs), these properties can be tuned by surface chemistry modification, but this has so far been accomplished at the expense of reduced surface passivation and compromised colloidal solubility; this has precluded the realization of advanced architectures such as CQD bulk homojunction solids. Here we introduce a cascade surface modification scheme that overcomes these limitations. This strategy provides control over doping and solubility and enables n-type and p-type CQD inks that are fully miscible in the same solvent with complete surface passivation. This enables the realization of homogeneous CQD bulk homojunction films that exhibit a 1.5 times increase in carrier diffusion length compared with the previous best CQD films. As a result, we demonstrate the highest power conversion efficiency (13.3%) reported among CQD solar cells.

Date: 2020
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DOI: 10.1038/s41467-019-13437-2

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