Target Therapy for Buried Interface Enables Stable Perovskite Solar Cells with 25.05% Efficiency

Xiaofei Ji; Leyu Bi; Qiang Fu; Bolin Li; Junwei Wang; Sang Young Jeong; Kui Feng; Suxiang Ma; Qiaogan Liao; Francis R. Lin; Han Young Woo; Linfeng Lu; Alex K.Y. Jen; Xugang Guo

doi:10.1002/adma.202303665

Target Therapy for Buried Interface Enables Stable Perovskite Solar Cells with 25.05% Efficiency

Xiaofei Ji
, Leyu Bi
, Qiang Fu^*
, Bolin Li
, Junwei Wang
, Sang Young Jeong
, Kui Feng
, Suxiang Ma
, Qiaogan Liao
, Francis R. Lin
, Han Young Woo
, Linfeng Lu
, Alex K.Y. Jen^*
, Xugang Guo^*

^*Corresponding author for this work

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

173 Citations (Scopus)

Abstract

The buried interface in perovskite solar cells (PSCs) is pivotal for achieving high efficiency and stability. However, it is challenging to study and optimize the buried interface due to its non-exposed feature. Here, a facile and effective strategy is developed to modify the SnO₂/perovskite buried interface by passivating the buried defects in perovskite and modulating carrier dynamics via incorporating formamidine oxalate (FOA) in SnO₂ nanoparticles. Both formamidinium and oxalate ions show a longitudinal gradient distribution in the SnO₂ layer, mainly accumulating at the SnO₂/perovskite buried interface, which enables high-quality upper perovskite films, minimized defects, superior interface contacts, and matched energy levels between perovskite and SnO₂. Significantly, FOA can simultaneously reduce the oxygen vacancies and tin interstitial defects on the SnO₂ surface and the FA⁺/Pb²⁺ associated defects at the perovskite buried interface. Consequently, the FOA treatment significantly improves the efficiency of the PSCs from 22.40% to 25.05% and their storage- and photo-stability. This method provides an effective target therapy of buried interface in PSCs to achieve very high efficiency and stability.

Original language	English
Article number	2303665
Journal	Advanced Materials
Volume	35
Issue number	39
DOIs	https://doi.org/10.1002/adma.202303665
Publication status	Published - 2023 Sept 27

Bibliographical note

Funding Information:
X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau‐Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012).

Funding Information:
X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012).

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

buried interface
defect passivation
oxalate
perovskite solar cells

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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10.1002/adma.202303665

Cite this

@article{f671795d04d94836a792fd4eb47b8142,

title = "Target Therapy for Buried Interface Enables Stable Perovskite Solar Cells with 25.05\% Efficiency",

abstract = "The buried interface in perovskite solar cells (PSCs) is pivotal for achieving high efficiency and stability. However, it is challenging to study and optimize the buried interface due to its non-exposed feature. Here, a facile and effective strategy is developed to modify the SnO2/perovskite buried interface by passivating the buried defects in perovskite and modulating carrier dynamics via incorporating formamidine oxalate (FOA) in SnO2 nanoparticles. Both formamidinium and oxalate ions show a longitudinal gradient distribution in the SnO2 layer, mainly accumulating at the SnO2/perovskite buried interface, which enables high-quality upper perovskite films, minimized defects, superior interface contacts, and matched energy levels between perovskite and SnO2. Significantly, FOA can simultaneously reduce the oxygen vacancies and tin interstitial defects on the SnO2 surface and the FA+/Pb2+ associated defects at the perovskite buried interface. Consequently, the FOA treatment significantly improves the efficiency of the PSCs from 22.40\% to 25.05\% and their storage- and photo-stability. This method provides an effective target therapy of buried interface in PSCs to achieve very high efficiency and stability.",

keywords = "buried interface, defect passivation, oxalate, perovskite solar cells",

author = "Xiaofei Ji and Leyu Bi and Qiang Fu and Bolin Li and Junwei Wang and Jeong, \{Sang Young\} and Kui Feng and Suxiang Ma and Qiaogan Liao and Lin, \{Francis R.\} and Woo, \{Han Young\} and Linfeng Lu and Jen, \{Alex K.Y.\} and Xugang Guo",

note = "Funding Information: X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau‐Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012). Funding Information: X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012). Publisher Copyright: {\textcopyright} 2023 Wiley-VCH GmbH.",

year = "2023",

month = sep,

day = "27",

doi = "10.1002/adma.202303665",

language = "English",

volume = "35",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley-Blackwell",

number = "39",

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TY - JOUR

T1 - Target Therapy for Buried Interface Enables Stable Perovskite Solar Cells with 25.05% Efficiency

AU - Ji, Xiaofei

AU - Bi, Leyu

AU - Fu, Qiang

AU - Li, Bolin

AU - Wang, Junwei

AU - Jeong, Sang Young

AU - Feng, Kui

AU - Ma, Suxiang

AU - Liao, Qiaogan

AU - Lin, Francis R.

AU - Woo, Han Young

AU - Lu, Linfeng

AU - Jen, Alex K.Y.

AU - Guo, Xugang

N1 - Funding Information: X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau‐Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012). Funding Information: X.G. is thankful for the financial support from the National Natural Science Foundation of China (52173171) and the Shenzhen Science and Technology Innovation Commission (JCYJ20220818100617037). A.K.Y.J. thanks the sponsorship of the Lee Shau-Kee Chair Professor (Materials Science), and the support from the APRC Grant of the City University of Hong Kong (9380086), the TCFS Grant (GHP/018/20SZ) and MRP Grant (MRP/040/21X) from the Innovation and Technology Commission of Hong Kong, the Green Tech Fund (202020164) from the Environment and Ecology Bureau of Hong Kong, the GRF grants (11307621, 11316422) from the Research Grants Council of Hong Kong, Guangdong Major Project of Basic and Applied Basic Research (2019B030302007), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002). L.L is grateful for the financial support from Shanxi Province Science and Technology Department (20201101012). Publisher Copyright: © 2023 Wiley-VCH GmbH.

PY - 2023/9/27

Y1 - 2023/9/27

N2 - The buried interface in perovskite solar cells (PSCs) is pivotal for achieving high efficiency and stability. However, it is challenging to study and optimize the buried interface due to its non-exposed feature. Here, a facile and effective strategy is developed to modify the SnO2/perovskite buried interface by passivating the buried defects in perovskite and modulating carrier dynamics via incorporating formamidine oxalate (FOA) in SnO2 nanoparticles. Both formamidinium and oxalate ions show a longitudinal gradient distribution in the SnO2 layer, mainly accumulating at the SnO2/perovskite buried interface, which enables high-quality upper perovskite films, minimized defects, superior interface contacts, and matched energy levels between perovskite and SnO2. Significantly, FOA can simultaneously reduce the oxygen vacancies and tin interstitial defects on the SnO2 surface and the FA+/Pb2+ associated defects at the perovskite buried interface. Consequently, the FOA treatment significantly improves the efficiency of the PSCs from 22.40% to 25.05% and their storage- and photo-stability. This method provides an effective target therapy of buried interface in PSCs to achieve very high efficiency and stability.

AB - The buried interface in perovskite solar cells (PSCs) is pivotal for achieving high efficiency and stability. However, it is challenging to study and optimize the buried interface due to its non-exposed feature. Here, a facile and effective strategy is developed to modify the SnO2/perovskite buried interface by passivating the buried defects in perovskite and modulating carrier dynamics via incorporating formamidine oxalate (FOA) in SnO2 nanoparticles. Both formamidinium and oxalate ions show a longitudinal gradient distribution in the SnO2 layer, mainly accumulating at the SnO2/perovskite buried interface, which enables high-quality upper perovskite films, minimized defects, superior interface contacts, and matched energy levels between perovskite and SnO2. Significantly, FOA can simultaneously reduce the oxygen vacancies and tin interstitial defects on the SnO2 surface and the FA+/Pb2+ associated defects at the perovskite buried interface. Consequently, the FOA treatment significantly improves the efficiency of the PSCs from 22.40% to 25.05% and their storage- and photo-stability. This method provides an effective target therapy of buried interface in PSCs to achieve very high efficiency and stability.

KW - buried interface

KW - defect passivation

KW - oxalate

KW - perovskite solar cells

UR - https://www.scopus.com/pages/publications/85165681056

U2 - 10.1002/adma.202303665

DO - 10.1002/adma.202303665

M3 - Article

AN - SCOPUS:85165681056

SN - 0935-9648

VL - 35

JO - Advanced Materials

JF - Advanced Materials

IS - 39

M1 - 2303665

ER -

Target Therapy for Buried Interface Enables Stable Perovskite Solar Cells with 25.05% Efficiency

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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