Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

Jea Woong Jo; Younghoon Kim; Jongmin Choi; F. Pelayo García de Arquer; Grant Walters; Bin Sun; Olivier Ouellette; Junghwan Kim; Andrew H. Proppe; Rafael Quintero-Bermudez; James Fan; Jixian Xu; Chih Shan Tan; Oleksandr Voznyy; Edward H. Sargent

doi:10.1002/adma.201703627

Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

Jea Woong Jo, Younghoon Kim, Jongmin Choi, F. Pelayo García de Arquer, Grant Walters, Bin Sun, Olivier Ouellette, Junghwan Kim, Andrew H. Proppe, Rafael Quintero-Bermudez, James Fan, Jixian Xu, Chih Shan Tan, Oleksandr Voznyy^*, Edward H. Sargent

^*Corresponding author for this work

Institute of Electronics

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

57 Scopus citations

Abstract

The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (V_OC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a V_OC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved.

Original language	English
Article number	1703627
Journal	Advanced Materials
Volume	29
Issue number	43
DOIs	https://doi.org/10.1002/adma.201703627
State	Published - 20 Nov 2017

Keywords

colloidal quantum dots
open-circuit voltage
photovoltaics
polydispersity
solution-phase ligand exchange

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10.1002/adma.201703627

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Jo, J. W., Kim, Y., Choi, J., de Arquer, F. P. G., Walters, G., Sun, B., Ouellette, O., Kim, J., Proppe, A. H., Quintero-Bermudez, R., Fan, J., Xu, J., Tan, C. S., Voznyy, O., & Sargent, E. H. (2017). Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange. Advanced Materials, 29(43), Article 1703627. https://doi.org/10.1002/adma.201703627

@article{bd039b03af654cfab8e89fff6e29e8fc,

title = "Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange",

abstract = "The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved.",

keywords = "colloidal quantum dots, open-circuit voltage, photovoltaics, polydispersity, solution-phase ligand exchange",

author = "Jo, {Jea Woong} and Younghoon Kim and Jongmin Choi and {de Arquer}, {F. Pelayo Garc{\'i}a} and Grant Walters and Bin Sun and Olivier Ouellette and Junghwan Kim and Proppe, {Andrew H.} and Rafael Quintero-Bermudez and James Fan and Jixian Xu and Tan, {Chih Shan} and Oleksandr Voznyy and Sargent, {Edward H.}",

year = "2017",

month = nov,

day = "20",

doi = "10.1002/adma.201703627",

language = "English",

volume = "29",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley-Blackwell",

number = "43",

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Jo, JW, Kim, Y, Choi, J, de Arquer, FPG, Walters, G, Sun, B, Ouellette, O, Kim, J, Proppe, AH, Quintero-Bermudez, R, Fan, J, Xu, J, Tan, CS, Voznyy, O & Sargent, EH 2017, 'Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange', Advanced Materials, vol. 29, no. 43, 1703627. https://doi.org/10.1002/adma.201703627

TY - JOUR

T1 - Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

AU - Jo, Jea Woong

AU - Kim, Younghoon

AU - Choi, Jongmin

AU - de Arquer, F. Pelayo García

AU - Walters, Grant

AU - Sun, Bin

AU - Ouellette, Olivier

AU - Kim, Junghwan

AU - Proppe, Andrew H.

AU - Quintero-Bermudez, Rafael

AU - Fan, James

AU - Xu, Jixian

AU - Tan, Chih Shan

AU - Voznyy, Oleksandr

AU - Sargent, Edward H.

PY - 2017/11/20

Y1 - 2017/11/20

N2 - The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved.

AB - The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved.

KW - colloidal quantum dots

KW - open-circuit voltage

KW - photovoltaics

KW - polydispersity

KW - solution-phase ligand exchange

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U2 - 10.1002/adma.201703627

DO - 10.1002/adma.201703627

M3 - Article

C2 - 28991386

AN - SCOPUS:85030650929

SN - 0935-9648

VL - 29

JO - Advanced Materials

JF - Advanced Materials

IS - 43

M1 - 1703627

ER -

Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

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