Synchronous amelioration of SnO<sub>2</sub>surface aggregation and buried layer defects by sodium salts for high-efficiency and stable perovskite solar cells

zha, leying; Lei, Ning; Zhang, Pengyun; Du, Pingfan; Xiong, Jie; Song, Lixin

doi:10.1039/d2se01686a

Sustainable Energy Fuels

2023

DOI: 10.1039/d2se01686a

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Synchronous amelioration of SnO₂surface aggregation and buried layer defects by sodium salts for high-efficiency and stable perovskite solar cells

leying zha

Ning Lei

Pengyun Zhang

et al.

Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) have received extensive attention due to their high efficiency, low cost and simple solution processability. In the regular PSCs, tin oxide (SnO2), as the...

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A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

Zha,

Ning,

Sun

et al. 2023

Advanced Optical Materials

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In perovskite solar cells (PSCs), the buried interface between the electron transfer layer (ETL) and perovskite (PVK) layer profoundly affects the charge carrier transfer efficiency, which has significant implications for the efficiency and long‐term stability of the device. Herein, an organic chemical compound 4,6‐diamino‐2‐mercaptosine (DMP) is incorporated into the ETL/PVK interface in order to optimize the interfacial performance through a hydrogen bond bridging junction. DMP is tightly anchored to the ETL surface by forming the intermolecular hydrogen bonding with the structure as N─H∙∙∙N. This bridge connection is beneficial for enhancing the interface contact, further restraining severe nonradiative charge recombination. Synchronously, the interaction of ─SH with uncoordinated Pb2+ passivates the defects on the bottom layer of perovskite, further regulating the perovskite crystal growth. Overall, the results express that the power conversion efficiency (PCE) of PSCs based on the DMP interface has significantly increased to 21.65% without obvious hysteresis. Meanwhile, the unencapsulated modified devices show superior environmental stability, maintaining over 85% of their initial PCE even after 500 h in an atmospheric environment.

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A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

Zha,

Ning,

Sun

et al. 2023

Advanced Optical Materials

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Enhancing Flexibility, Long-Term Stability, and Efficiency in Full Air Fabricated Perovskite Solar Cells via Multifunctional Fluorinated Polyurethane Additives

Duan,

Zha,

Song

et al. 2024

Langmuir

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Perovskite films often suffer from surface and grain boundary defects, including uncoordinated ions, lattice distortions, and dangling bonds, coupled with lattice distortions due to solvent volatilization anisotropy and the thermal expansion coefficient. Such defects severely compromise both the photovoltaic efficiency and longterm solar cell stability. Here, fluorinated polyurethane (FPU) was synthesized and introduced into the perovskite precursor as a multifunctional additive. Excess Pb 2+ ions interact with the carbonyl group (C�O) of FPU, thereby reducing nonradiative recombination. The perovskite and FPU form various hydrogen bonds via MA + with F and −NH with −I. This multiplies the passivation of grain boundary defects, increases grain size, reduces defect density, releases residual lattice stress, and facilitates charge transport. Accordingly, the power conversion efficiency of the FPU-modified perovskite solar cells (PSCs) on rigid substrates and flexible substrates reached 21.18 and 17.76%, respectively. Notably, the long-chain C−F compound, which constructs a moisture-resistant barrier, could inhibit moisture corrosion in the perovskite films. After 2000 h of storage at ambient temperature in dark, the PSCs's initial efficiency still remained 82%. Additionally, after it undergoes 300 bending cycles (r = 0.7 cm), the device maintains 92.4% of its initial efficiency.

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Synchronous amelioration of SnO₂surface aggregation and buried layer defects by sodium salts for high-efficiency and stable perovskite solar cells

Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) have received extensive attention due to their high efficiency, low cost and simple solution processability. In the regular PSCs, tin oxide (SnO2), as the...

Cited by 2 publications

References 44 publications

A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

Enhancing Flexibility, Long-Term Stability, and Efficiency in Full Air Fabricated Perovskite Solar Cells via Multifunctional Fluorinated Polyurethane Additives

Contact Info

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About

Synchronous amelioration of SnO2surface aggregation and buried layer defects by sodium salts for high-efficiency and stable perovskite solar cells

Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) have received extensive attention due to their high efficiency, low cost and simple solution processability. In the regular PSCs, tin oxide (SnO2), as the...

Cited by 2 publications

References 44 publications

A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

A Multifunctional Hydrogen Bond Bridge Interface to Achieving Efficient and Stable Perovskite Solar Cells

Enhancing Flexibility, Long-Term Stability, and Efficiency in Full Air Fabricated Perovskite Solar Cells via Multifunctional Fluorinated Polyurethane Additives

Contact Info

Product

Resources

About

Synchronous amelioration of SnO₂surface aggregation and buried layer defects by sodium salts for high-efficiency and stable perovskite solar cells