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

Department of Energy and Materials Engineering

University of Toronto

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

147 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 - 6 Sep 2017

Keywords

band alignment
passivation
quantum-dot solar cells
ZnO

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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

@article{3d002f8d66374678b6eb161379666048,

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

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",

volume = "29",

journal = "Advanced Materials",

issn = "0935-9648",

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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

TY - JOUR

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 - band alignment

KW - passivation

KW - quantum-dot solar cells

KW - ZnO

UR - https://www.scopus.com/pages/publications/85021710994

U2 - 10.1002/adma.201702350

DO - 10.1002/adma.201702350

M3 - Article

C2 - 28671721

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

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Keywords

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