ZnO electron transporting layer engineering realized over 20% efficiency and over 1.28 V open-circuit voltage in all-inorganic perovskite solar cells

Xiao Wu; Jianquan Zhang; Minchao Qin; Kuan Liu; Ziyu Lv; Zhaotong Qin; Xinlu Guo; Yuhao Li; Jianbin Xu; Gang Li; He Yan; Xinhui Lu

doi:10.1002/eom2.12192

ZnO electron transporting layer engineering realized over 20% efficiency and over 1.28 V open-circuit voltage in all-inorganic perovskite solar cells

Xiao Wu, Jianquan Zhang, Minchao Qin, Kuan Liu, Ziyu Lv, Zhaotong Qin, Xinlu Guo, Yuhao Li, Jianbin Xu, Gang Li, He Yan, Xinhui Lu

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

28 Citations (Scopus)

Abstract

Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the V_OC. In this work, we developed low-temperature processed ZnO as an ETL alternative. Incorporation of PbX₂ (X = I,Cl, and CH₃COO) was found to increase oxygen vacancies in ZnO, which not only promoted the growth of all-inorganic perovskite layer with improved morphology and orientational order, but also formed a favorable energy level alignment with the perovskite layer, thus facilitating charge extraction and suppressing charge recombination. Consequently, the CsPb(I_{1 x}Br_x)₃ PSCs based on PbX₂:ZnO exhibited enhanced stability and performance. The efficiency was boosted from 17.64% to 20.04% with an improved fill factor of 84.14% and a V_OC of 1.28 V, being the highest V_OC among highly efficient (>20%) all-inorganic PSCs to date.

Original language	English
Article number	e12192
Pages (from-to)	1-11
Journal	EcoMat
Volume	4
Issue number	4
DOIs	https://doi.org/10.1002/eom2.12192
Publication status	Published - Jul 2022

Keywords

all-inorganic
energy level
oxygen vacancy
perovskite solar cells
ZnO

ASJC Scopus subject areas

Chemistry (miscellaneous)
Physical and Theoretical Chemistry
Materials Science (miscellaneous)

More information

10.1002/eom2.12192

Cite this

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title = "ZnO electron transporting layer engineering realized over 20% efficiency and over 1.28 V open-circuit voltage in all-inorganic perovskite solar cells",

abstract = "Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the VOC. In this work, we developed low-temperature processed ZnO as an ETL alternative. Incorporation of PbX2 (X = I,Cl, and CH3COO) was found to increase oxygen vacancies in ZnO, which not only promoted the growth of all-inorganic perovskite layer with improved morphology and orientational order, but also formed a favorable energy level alignment with the perovskite layer, thus facilitating charge extraction and suppressing charge recombination. Consequently, the CsPb(I1 xBrx)3 PSCs based on PbX2:ZnO exhibited enhanced stability and performance. The efficiency was boosted from 17.64% to 20.04% with an improved fill factor of 84.14% and a VOC of 1.28 V, being the highest VOC among highly efficient (>20%) all-inorganic PSCs to date.",

keywords = "all-inorganic, energy level, oxygen vacancy, perovskite solar cells, ZnO",

author = "Xiao Wu and Jianquan Zhang and Minchao Qin and Kuan Liu and Ziyu Lv and Zhaotong Qin and Xinlu Guo and Yuhao Li and Jianbin Xu and Gang Li and He Yan and Xinhui Lu",

note = "Funding Information: The authors acknowledge the financial support from the Research Grant Council of Hong Kong (RGC) (General Research Fund No. 14305721) and CUHK PIEF and CRIMS Grant (3133288). Funding Information: CUHK PIEF and CRIMS Grant, Grant/ Award Number: 3133288; Research Grant Council of Hong Kong (RGC) General Research Fund, Grant/Award Number: 14305721 Publisher Copyright: {\textcopyright} 2022 The Authors. EcoMat published by The Hong Kong Polytechnic University and John Wiley & Sons Australia, Ltd.",

year = "2022",

month = jul,

doi = "10.1002/eom2.12192",

language = "English",

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TY - JOUR

T1 - ZnO electron transporting layer engineering realized over 20% efficiency and over 1.28 V open-circuit voltage in all-inorganic perovskite solar cells

AU - Wu, Xiao

AU - Zhang, Jianquan

AU - Qin, Minchao

AU - Liu, Kuan

AU - Lv, Ziyu

AU - Qin, Zhaotong

AU - Guo, Xinlu

AU - Li, Yuhao

AU - Xu, Jianbin

AU - Li, Gang

AU - Yan, He

AU - Lu, Xinhui

N1 - Funding Information: The authors acknowledge the financial support from the Research Grant Council of Hong Kong (RGC) (General Research Fund No. 14305721) and CUHK PIEF and CRIMS Grant (3133288). Funding Information: CUHK PIEF and CRIMS Grant, Grant/ Award Number: 3133288; Research Grant Council of Hong Kong (RGC) General Research Fund, Grant/Award Number: 14305721 Publisher Copyright: © 2022 The Authors. EcoMat published by The Hong Kong Polytechnic University and John Wiley & Sons Australia, Ltd.

PY - 2022/7

Y1 - 2022/7

N2 - Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the VOC. In this work, we developed low-temperature processed ZnO as an ETL alternative. Incorporation of PbX2 (X = I,Cl, and CH3COO) was found to increase oxygen vacancies in ZnO, which not only promoted the growth of all-inorganic perovskite layer with improved morphology and orientational order, but also formed a favorable energy level alignment with the perovskite layer, thus facilitating charge extraction and suppressing charge recombination. Consequently, the CsPb(I1 xBrx)3 PSCs based on PbX2:ZnO exhibited enhanced stability and performance. The efficiency was boosted from 17.64% to 20.04% with an improved fill factor of 84.14% and a VOC of 1.28 V, being the highest VOC among highly efficient (>20%) all-inorganic PSCs to date.

AB - Cesium lead based all-inorganic perovskite solar cells (PSCs) are promising candidates for tandem solar cells owing to their favorable thermal stability and suitable bandgap. However, to exploit the advantage to the full, there is still huge room to reduce energy loss and enhance the VOC. In this work, we developed low-temperature processed ZnO as an ETL alternative. Incorporation of PbX2 (X = I,Cl, and CH3COO) was found to increase oxygen vacancies in ZnO, which not only promoted the growth of all-inorganic perovskite layer with improved morphology and orientational order, but also formed a favorable energy level alignment with the perovskite layer, thus facilitating charge extraction and suppressing charge recombination. Consequently, the CsPb(I1 xBrx)3 PSCs based on PbX2:ZnO exhibited enhanced stability and performance. The efficiency was boosted from 17.64% to 20.04% with an improved fill factor of 84.14% and a VOC of 1.28 V, being the highest VOC among highly efficient (>20%) all-inorganic PSCs to date.

KW - all-inorganic

KW - energy level

KW - oxygen vacancy

KW - perovskite solar cells

KW - ZnO

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DO - 10.1002/eom2.12192

M3 - Journal article

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SN - 2567-3173

VL - 4

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EP - 11

JO - EcoMat

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IS - 4

M1 - e12192

ER -

ZnO electron transporting layer engineering realized over 20% efficiency and over 1.28 V open-circuit voltage in all-inorganic perovskite solar cells

Abstract

Keywords

ASJC Scopus subject areas

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