Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics

Bin Sun; Oleksandr Voznyy; Hairen Tan; Philipp Stadler; Mengxia Liu; Grant Walters; Andrew H. Proppe; Min Liu; James Fan; Taotao Zhuang; Jie Li; Mingyang Wei; Jixian Xu; Younghoon Kim; Sjoerd Hoogland; Edward H. Sargent

doi:10.1002/adma.201700749

Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics

Bin Sun, Oleksandr Voznyy, Hairen Tan, Philipp Stadler, Mengxia Liu, Grant Walters, Andrew H. Proppe, Min Liu, James Fan, Taotao Zhuang, Jie Li, Mingyang Wei, Jixian Xu, Younghoon Kim, Sjoerd Hoogland, Edward H. Sargent

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

82 Scopus citations

Abstract

Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the solar-cell performance by reducing the trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs of halogens, whose chemistry allows them to substitute halogen atoms by strong chemical interactions with the CQD surfaces. The pseudohalide thiocyanate anion is used to achieve a hybrid surface passivation. A fourfold reduced trap state density than in a control is observed by using a suite of field-effect transistor studies. This translates directly into the thickest CQD active layer ever reported, enabled by enhanced transport lengths in this new class of materials, and leads to the highest external quantum efficiency, 80% at the excitonic peak, compared with previous reports of CQD solar cells.

Original language	English
Article number	1700749
Journal	Advanced Materials
Volume	29
Issue number	27
DOIs	https://doi.org/10.1002/adma.201700749
State	Published - Jul 19 2017
Externally published	Yes

Keywords

field-effect transistors
quantum dots
solar cells
surface passivation
thiocyanate

UN SDGs

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

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10.1002/adma.201700749

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title = "Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics",

abstract = "Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the solar-cell performance by reducing the trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs of halogens, whose chemistry allows them to substitute halogen atoms by strong chemical interactions with the CQD surfaces. The pseudohalide thiocyanate anion is used to achieve a hybrid surface passivation. A fourfold reduced trap state density than in a control is observed by using a suite of field-effect transistor studies. This translates directly into the thickest CQD active layer ever reported, enabled by enhanced transport lengths in this new class of materials, and leads to the highest external quantum efficiency, 80% at the excitonic peak, compared with previous reports of CQD solar cells.",

keywords = "field-effect transistors, quantum dots, solar cells, surface passivation, thiocyanate",

author = "Bin Sun and Oleksandr Voznyy and Hairen Tan and Philipp Stadler and Mengxia Liu and Grant Walters and Proppe, {Andrew H.} and Min Liu and James Fan and Taotao Zhuang and Jie Li and Mingyang Wei and Jixian Xu and Younghoon Kim and Sjoerd Hoogland and Sargent, {Edward H.}",

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

year = "2017",

month = jul,

day = "19",

doi = "10.1002/adma.201700749",

language = "English",

volume = "29",

journal = "Advanced Materials",

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TY - JOUR

T1 - Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics

AU - Sun, Bin

AU - Voznyy, Oleksandr

AU - Tan, Hairen

AU - Stadler, Philipp

AU - Liu, Mengxia

AU - Walters, Grant

AU - Proppe, Andrew H.

AU - Liu, Min

AU - Fan, James

AU - Zhuang, Taotao

AU - Li, Jie

AU - Wei, Mingyang

AU - Xu, Jixian

AU - Kim, Younghoon

AU - Hoogland, Sjoerd

AU - Sargent, Edward H.

PY - 2017/7/19

Y1 - 2017/7/19

N2 - Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the solar-cell performance by reducing the trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs of halogens, whose chemistry allows them to substitute halogen atoms by strong chemical interactions with the CQD surfaces. The pseudohalide thiocyanate anion is used to achieve a hybrid surface passivation. A fourfold reduced trap state density than in a control is observed by using a suite of field-effect transistor studies. This translates directly into the thickest CQD active layer ever reported, enabled by enhanced transport lengths in this new class of materials, and leads to the highest external quantum efficiency, 80% at the excitonic peak, compared with previous reports of CQD solar cells.

AB - Application of pseudohalogens in colloidal quantum dot (CQD) solar-cell active layers increases the solar-cell performance by reducing the trap densities and implementing thick CQD films. Pseudohalogens are polyatomic analogs of halogens, whose chemistry allows them to substitute halogen atoms by strong chemical interactions with the CQD surfaces. The pseudohalide thiocyanate anion is used to achieve a hybrid surface passivation. A fourfold reduced trap state density than in a control is observed by using a suite of field-effect transistor studies. This translates directly into the thickest CQD active layer ever reported, enabled by enhanced transport lengths in this new class of materials, and leads to the highest external quantum efficiency, 80% at the excitonic peak, compared with previous reports of CQD solar cells.

KW - field-effect transistors

KW - quantum dots

KW - solar cells

KW - surface passivation

KW - thiocyanate

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U2 - 10.1002/adma.201700749

DO - 10.1002/adma.201700749

M3 - Article

C2 - 28488790

AN - SCOPUS:85019169875

SN - 0935-9648

VL - 29

JO - Advanced Materials

JF - Advanced Materials

IS - 27

M1 - 1700749

ER -

Pseudohalide-Exchanged Quantum Dot Solids Achieve Record Quantum Efficiency in Infrared Photovoltaics

Abstract

Keywords

UN SDGs

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