Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

Jongmin Choi; Younghoon Kim; Jea Woong Jo; Junghwan Kim; Bin Sun; Grant Walters; F. Pelayo García de Arquer; Rafael Quintero-Bermudez; Yiying Li; Chih Shan Tan; Li Na Quan; Andrew Pak Tao Kam; Sjoerd Hoogland; Zhenghong Lu; Oleksandr Voznyy; Edward H. Sargent

doi:10.1002/adma.201702350

Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

Jongmin Choi, Younghoon Kim, Jea Woong Jo, Junghwan Kim, Bin Sun, Grant Walters, F. Pelayo García de Arquer, Rafael Quintero-Bermudez, Yiying Li, Chih Shan Tan, Li Na Quan, Andrew Pak Tao Kam, Sjoerd Hoogland, Zhenghong Lu, Oleksandr Voznyy, Edward H. Sargent

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

138 Scopus citations

Abstract

The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 ± 0.2%.

Original language	English
Article number	1702350
Journal	Advanced Materials
Volume	29
Issue number	33
DOIs	https://doi.org/10.1002/adma.201702350
State	Published - Sep 6 2017
Externally published	Yes

Keywords

ZnO
band alignment
passivation
quantum-dot solar cells

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/adma.201702350

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Choi, J., Kim, Y., Jo, J. W., Kim, J., Sun, B., Walters, G., García de Arquer, F. P., Quintero-Bermudez, R., Li, Y., Tan, C. S., Quan, L. N., Kam, A. P. T., Hoogland, S., Lu, Z., Voznyy, O., & Sargent, E. H. (2017). Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics. Advanced Materials, 29(33), Article 1702350. https://doi.org/10.1002/adma.201702350

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title = "Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics",

abstract = "The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 ± 0.2%.",

keywords = "ZnO, band alignment, passivation, quantum-dot solar cells",

author = "Jongmin Choi and Younghoon Kim and Jo, {Jea Woong} and Junghwan Kim and Bin Sun and Grant Walters and {Garc{\'i}a de Arquer}, {F. Pelayo} and Rafael Quintero-Bermudez and Yiying Li and Tan, {Chih Shan} and Quan, {Li Na} and Kam, {Andrew Pak Tao} and Sjoerd Hoogland and Zhenghong Lu and Oleksandr Voznyy and Sargent, {Edward H.}",

note = "Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2017",

month = sep,

day = "6",

doi = "10.1002/adma.201702350",

language = "English",

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Choi, J, Kim, Y, Jo, JW, Kim, J, Sun, B, Walters, G, García de Arquer, FP, Quintero-Bermudez, R, Li, Y, Tan, CS, Quan, LN, Kam, APT, Hoogland, S, Lu, Z, Voznyy, O & Sargent, EH 2017, 'Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics', Advanced Materials, vol. 29, no. 33, 1702350. https://doi.org/10.1002/adma.201702350

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T1 - Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

AU - Choi, Jongmin

AU - Kim, Younghoon

AU - Jo, Jea Woong

AU - Kim, Junghwan

AU - Sun, Bin

AU - Walters, Grant

AU - García de Arquer, F. Pelayo

AU - Quintero-Bermudez, Rafael

AU - Li, Yiying

AU - Tan, Chih Shan

AU - Quan, Li Na

AU - Kam, Andrew Pak Tao

AU - Hoogland, Sjoerd

AU - Lu, Zhenghong

AU - Voznyy, Oleksandr

AU - Sargent, Edward H.

PY - 2017/9/6

Y1 - 2017/9/6

N2 - The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 ± 0.2%.

AB - The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 ± 0.2%.

KW - ZnO

KW - band alignment

KW - passivation

KW - quantum-dot solar cells

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DO - 10.1002/adma.201702350

M3 - Article

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AN - SCOPUS:85021710994

SN - 0935-9648

VL - 29

JO - Advanced Materials

JF - Advanced Materials

IS - 33

M1 - 1702350

ER -

Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

Abstract

Keywords

UN SDGs

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