A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics

Younghoon Kim; Fanglin Che; Jea Woong Jo; Jongmin Choi; F. Pelayo García de Arquer; Oleksandr Voznyy; Bin Sun; Junghwan Kim; Min Jae Choi; Rafael Quintero-Bermudez; Fengjia Fan; Chih Shan Tan; Eva Bladt; Grant Walters; Andrew H. Proppe; Chengqin Zou; Haifeng Yuan; Sara Bals; Johan Hofkens; Maarten B.J. Roeffaers; Sjoerd Hoogland; Edward H. Sargent

doi:10.1002/adma.201805580

A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics

Younghoon Kim, Fanglin Che, Jea Woong Jo, Jongmin Choi, F. Pelayo García de Arquer, Oleksandr Voznyy, Bin Sun, Junghwan Kim, Min Jae Choi, Rafael Quintero-Bermudez, Fengjia Fan, Chih Shan Tan, Eva Bladt, Grant Walters, Andrew H. Proppe, Chengqin Zou, Haifeng Yuan, Sara Bals, Johan Hofkens, Maarten B.J. RoeffaersSjoerd Hoogland, Edward H. Sargent^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

93 Scopus citations

Abstract

Colloidal nanocrystals combine size- and facet-dependent properties with solution processing. They offer thus a compelling suite of materials for technological applications. Their size- and facet-tunable features are studied in synthesis; however, to exploit their features in optoelectronic devices, it will be essential to translate control over size and facets from the colloid all the way to the film. Larger-diameter colloidal quantum dots (CQDs) offer the attractive possibility of harvesting infrared (IR) solar energy beyond absorption of silicon photovoltaics. These CQDs exhibit facets (nonpolar (100)) undisplayed in small-diameter CQDs; and the materials chemistry of smaller nanocrystals fails consequently to translate to materials for the short-wavelength IR regime. A new colloidal management strategy targeting the passivation of both (100) and (111) facets is demonstrated using distinct choices of cations and anions. The approach leads to narrow-bandgap CQDs with impressive colloidal stability and photoluminescence quantum yield. Photophysical studies confirm a reduction both in Stokes shift (≈47 meV) and Urbach tail (≈29 meV). This approach provides a ≈50% increase in the power conversion efficiency of IR photovoltaics compared to controls, and a ≈70% external quantum efficiency at their excitonic peak.

Original language	English (US)
Article number	1805580
Journal	Advanced Materials
Volume	31
Issue number	17
DOIs	https://doi.org/10.1002/adma.201805580
State	Published - Apr 25 2019

Funding

Y.K., F.C., J.W.J., and J.C. contributed equally. This work was supported by King Abdullah University of Science and Technology (KAUST, Office of Sponsored Research (OSR), Award No. OSR-2017-CPF-3325) and Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7). E.B. gratefully acknowledges financial support by the Research Foundation-Flanders (FWO Vlaanderen). Y.K. received financial support from the DGIST R&D Programs of the Ministry of Science, ICT & Future Planning of Korea (18-ET-01). M.B.J.R. and J.H. acknowledge financial support from the Research Foundation-Flanders (FWO, grants nr ZW15_09-GOH6316 and G.098319N) and the Flemish government through long-term structural funding Methusalem (CASAS2, Meth/15/04). H.Y. acknowledges the Research Foundation-Flanders (FWO) for a postdoctoral fellowship. The authors thank L. Levina, R. Wolowiec, D. Kopilovic, and E. Palmiano for their technical help over the course of this research.

Keywords

colloidal quantum dots
facet-specific passivation
infrared solar cells
narrow bandgap
sodium acetate

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
General Materials Science

Access to Document

10.1002/adma.201805580

Cite this

Kim, Y., Che, F., Jo, J. W., Choi, J., García de Arquer, F. P., Voznyy, O., Sun, B., Kim, J., Choi, M. J., Quintero-Bermudez, R., Fan, F., Tan, C. S., Bladt, E., Walters, G., Proppe, A. H., Zou, C., Yuan, H., Bals, S., Hofkens, J., ... Sargent, E. H. (2019). A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics. Advanced Materials, 31(17), Article 1805580. https://doi.org/10.1002/adma.201805580

@article{ea2f98048d334cb887f6a25f17300abf,

title = "A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics",

abstract = "Colloidal nanocrystals combine size- and facet-dependent properties with solution processing. They offer thus a compelling suite of materials for technological applications. Their size- and facet-tunable features are studied in synthesis; however, to exploit their features in optoelectronic devices, it will be essential to translate control over size and facets from the colloid all the way to the film. Larger-diameter colloidal quantum dots (CQDs) offer the attractive possibility of harvesting infrared (IR) solar energy beyond absorption of silicon photovoltaics. These CQDs exhibit facets (nonpolar (100)) undisplayed in small-diameter CQDs; and the materials chemistry of smaller nanocrystals fails consequently to translate to materials for the short-wavelength IR regime. A new colloidal management strategy targeting the passivation of both (100) and (111) facets is demonstrated using distinct choices of cations and anions. The approach leads to narrow-bandgap CQDs with impressive colloidal stability and photoluminescence quantum yield. Photophysical studies confirm a reduction both in Stokes shift (≈47 meV) and Urbach tail (≈29 meV). This approach provides a ≈50% increase in the power conversion efficiency of IR photovoltaics compared to controls, and a ≈70% external quantum efficiency at their excitonic peak.",

keywords = "colloidal quantum dots, facet-specific passivation, infrared solar cells, narrow bandgap, sodium acetate",

author = "Younghoon Kim and Fanglin Che and Jo, {Jea Woong} and Jongmin Choi and {Garc{\'i}a de Arquer}, {F. Pelayo} and Oleksandr Voznyy and Bin Sun and Junghwan Kim and Choi, {Min Jae} and Rafael Quintero-Bermudez and Fengjia Fan and Tan, {Chih Shan} and Eva Bladt and Grant Walters and Proppe, {Andrew H.} and Chengqin Zou and Haifeng Yuan and Sara Bals and Johan Hofkens and Roeffaers, {Maarten B.J.} and Sjoerd Hoogland and Sargent, {Edward H.}",

note = "Publisher Copyright: {\textcopyright} 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2019",

month = apr,

day = "25",

doi = "10.1002/adma.201805580",

language = "English (US)",

volume = "31",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley-VCH Verlag",

number = "17",

}

Kim, Y, Che, F, Jo, JW, Choi, J, García de Arquer, FP, Voznyy, O, Sun, B, Kim, J, Choi, MJ, Quintero-Bermudez, R, Fan, F, Tan, CS, Bladt, E, Walters, G, Proppe, AH, Zou, C, Yuan, H, Bals, S, Hofkens, J, Roeffaers, MBJ, Hoogland, S & Sargent, EH 2019, 'A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics', Advanced Materials, vol. 31, no. 17, 1805580. https://doi.org/10.1002/adma.201805580

TY - JOUR

T1 - A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics

AU - Kim, Younghoon

AU - Che, Fanglin

AU - Jo, Jea Woong

AU - Choi, Jongmin

AU - García de Arquer, F. Pelayo

AU - Voznyy, Oleksandr

AU - Sun, Bin

AU - Kim, Junghwan

AU - Choi, Min Jae

AU - Quintero-Bermudez, Rafael

AU - Fan, Fengjia

AU - Tan, Chih Shan

AU - Bladt, Eva

AU - Walters, Grant

AU - Proppe, Andrew H.

AU - Zou, Chengqin

AU - Yuan, Haifeng

AU - Bals, Sara

AU - Hofkens, Johan

AU - Roeffaers, Maarten B.J.

AU - Hoogland, Sjoerd

AU - Sargent, Edward H.

PY - 2019/4/25

Y1 - 2019/4/25

N2 - Colloidal nanocrystals combine size- and facet-dependent properties with solution processing. They offer thus a compelling suite of materials for technological applications. Their size- and facet-tunable features are studied in synthesis; however, to exploit their features in optoelectronic devices, it will be essential to translate control over size and facets from the colloid all the way to the film. Larger-diameter colloidal quantum dots (CQDs) offer the attractive possibility of harvesting infrared (IR) solar energy beyond absorption of silicon photovoltaics. These CQDs exhibit facets (nonpolar (100)) undisplayed in small-diameter CQDs; and the materials chemistry of smaller nanocrystals fails consequently to translate to materials for the short-wavelength IR regime. A new colloidal management strategy targeting the passivation of both (100) and (111) facets is demonstrated using distinct choices of cations and anions. The approach leads to narrow-bandgap CQDs with impressive colloidal stability and photoluminescence quantum yield. Photophysical studies confirm a reduction both in Stokes shift (≈47 meV) and Urbach tail (≈29 meV). This approach provides a ≈50% increase in the power conversion efficiency of IR photovoltaics compared to controls, and a ≈70% external quantum efficiency at their excitonic peak.

AB - Colloidal nanocrystals combine size- and facet-dependent properties with solution processing. They offer thus a compelling suite of materials for technological applications. Their size- and facet-tunable features are studied in synthesis; however, to exploit their features in optoelectronic devices, it will be essential to translate control over size and facets from the colloid all the way to the film. Larger-diameter colloidal quantum dots (CQDs) offer the attractive possibility of harvesting infrared (IR) solar energy beyond absorption of silicon photovoltaics. These CQDs exhibit facets (nonpolar (100)) undisplayed in small-diameter CQDs; and the materials chemistry of smaller nanocrystals fails consequently to translate to materials for the short-wavelength IR regime. A new colloidal management strategy targeting the passivation of both (100) and (111) facets is demonstrated using distinct choices of cations and anions. The approach leads to narrow-bandgap CQDs with impressive colloidal stability and photoluminescence quantum yield. Photophysical studies confirm a reduction both in Stokes shift (≈47 meV) and Urbach tail (≈29 meV). This approach provides a ≈50% increase in the power conversion efficiency of IR photovoltaics compared to controls, and a ≈70% external quantum efficiency at their excitonic peak.

KW - colloidal quantum dots

KW - facet-specific passivation

KW - infrared solar cells

KW - narrow bandgap

KW - sodium acetate

UR - http://www.scopus.com/inward/record.url?scp=85062789296&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062789296&partnerID=8YFLogxK

U2 - 10.1002/adma.201805580

DO - 10.1002/adma.201805580

M3 - Article

C2 - 30860292

AN - SCOPUS:85062789296

SN - 0935-9648

VL - 31

JO - Advanced Materials

JF - Advanced Materials

IS - 17

M1 - 1805580

ER -

A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics

Abstract

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this