4.1 Review

Interfacial Engineering for Improved Stability of Flexible Perovskite Solar Cells

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Article Chemistry, Physical

MoO3 doped PTAA for high-performance inverted perovskite solar cells

Chenyue Wang et al.

Summary: This study successfully improved the performance of planar perovskite solar cells by doping poly[bis(4-phenyl)(2,4,6-triMethylphenyl)aMine] (PTAA) with 3 wt% molybdenum oxide (MoO3), resulting in better hole transport efficiency and extraction at the PTAA/perovskite interface. The power conversion efficiency of the fabricated PSCs using MoO3-doped PTAA HTL reached 20.06%, compared to 17.71% with pristine PTAA HTL, demonstrating the potential of MoO3 as a dopant for enhancing HTLs in high-performance PSCs and other perovskite-based optoelectronics.

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Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells

Xiaodong Li et al.

Summary: A stable perovskite heterojunction was achieved in inverted solar cells by sulfidating the surface of lead-rich perovskite films, resulting in improved power conversion efficiency and open-circuit voltage.

SCIENCE (2022)

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Room Temperature Fabrication of SnO2 Electrodes Enabling Barrier-Free Electron Extraction for Efficient Flexible Perovskite Photovoltaics

Jun-Xing Zhong et al.

Summary: Room temperature-processed electron transport layers (RT-ETLs) have great potential in fabricating high-performance flexible perovskite solar cells (PSCs) in an energy-saving manner. However, the performance of RT-ETL is normally limited due to various issues. In this study, a novel strategy is demonstrated to prepare annealing-free RT-ETL, which optimizes the interfacial energy level alignment and significantly enhances the device efficiency.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Pre-Buried Additive for Cross-Layer Modification in Flexible Perovskite Solar Cells with Efficiency Exceeding 22%

Zhonghao Zheng et al.

Summary: Halide perovskites have shown great potential in flexible photovoltaics. However, the performance of flexible perovskite solar cells (F-PSCs) has been limited by interfacial stress and lattice mismatch caused by the deformation of flexible substrates. This study uses ammonium formate as an additive in the electron transport layer to modify the layers and their interface, resulting in improved electron extraction, relaxed strain, and reduced defect densities. As a result, the highest power conversion efficiency reported so far is achieved for F-PSCs.

ADVANCED MATERIALS (2022)

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Record-Efficiency Flexible Perovskite Solar Cells Enabled by Multifunctional Organic Ions Interface Passivation

Lu Yang et al.

Summary: A novel compound HADI was designed to improve the efficiency and stability of flexible perovskite solar cells, showing significant roles in surface modification, passivation, and charge transfer. PSCs based on HADI-SnO2 electron transport layer exhibited outstanding performance.

ADVANCED MATERIALS (2022)

Article Chemistry, Multidisciplinary

Full-Dimensional Grain Boundary Stress Release for Flexible Perovskite Indoor Photovoltaics

Chun-Hao Chen et al.

Summary: This article discusses a full-dimensional grain boundary stress release strategy for flexible perovskite indoor photovoltaics. By using borax as a 3D crosslinking agent, the mechanical and phase stabilities of the perovskite films are improved. The fabricated devices show high conversion efficiencies under indoor conditions.

ADVANCED MATERIALS (2022)

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Semi-Planar Non-Fullerene Molecules Enhance the Durability of Flexible Perovskite Solar Cells

Hairui Liu et al.

Summary: The introduction of Y6 as a buffer layer for SnO2-based flexible perovskite solar cells enhances charge extraction ability, bending stability, and reduces internal stress of perovskite films. It also improves interfacial charge extraction and reduces defect density.

ADVANCED SCIENCE (2022)

Article Chemistry, Physical

Flexible Perovskite Solar Cells: From Materials and Device Architectures to Applications

Yuanji Gao et al.

Summary: In this article, recent progress in flexible perovskite solar cells (f-PSCs) is reviewed, including flexible substrates, flexible transparent electrodes, performance optimization, large-scale fabrication techniques, and flexibility enhancement strategies. The potential applications and future development prospects of f-PSCs are also discussed.

ACS ENERGY LETTERS (2022)

Article Chemistry, Multidisciplinary

Stable and Highly Flexible Perovskite Solar Cells with Power Conversion Efficiency Approaching 20% by Elastic Grain Boundary Encapsulation

Chengda Ge et al.

Summary: Flexible perovskite solar cells with high operational stability and power conversion efficiency close to 20% were achieved through elastic grain boundary encapsulation. The introduction of elastic V3D3 and solvent annealing resulted in in situ cross-linking reaction between grain boundaries, leading to enhanced charge-transport properties and improved mechanical and operational stability. The use of insulating elastic V3D3 for grain boundary encapsulation suppressed carrier recombination and ion migration, preserving over 73% of initial PCE after 10,000 bending cycles and 83% of stabilized PCE after 300 hours of continuous operation under one sun illumination.

CCS CHEMISTRY (2021)

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Low-Bandgap Organic Bulk-Heterojunction Enabled Efficient and Flexible Perovskite Solar Cells

Shengfan Wu et al.

Summary: Lead halide perovskite and organic solar cells are seen as promising candidates for clean energy applications, but improvements are needed in the near-infrared photon loss and photovoltage deficit. By integrating low-bandgap organic bulk-heterojunction layers into inverted PSCs, high-performance hybrid solar cells can be constructed. These hybrid solar cells demonstrate excellent power conversion efficiency, extended photoresponse, and superior long-term stability compared to single-component PSCs and OSCs. With the highest efficiency reported for flexible solar cells to date, flexible HSCs can be integrated as a power source for wearable sensors, demonstrating real-time temperature monitoring capabilities.

ADVANCED MATERIALS (2021)

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Roles of MACl in Sequentially Deposited Bromine-Free Perovskite Absorbers for Efficient Solar Cells

Feihong Ye et al.

Summary: This study systematically investigated the role of MACl in sequentially deposited Br-free FA-based perovskites, revealing that MACl can regulate the reaction, phase transition, and crystallization. Compared to traditional FAPbI(3), perovskites with MACl exhibit superior performance in terms of grain size, carrier lifetime, and trap density.

ADVANCED MATERIALS (2021)

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Buried Interfaces in Halide Perovskite Photovoltaics

Xiaoyu Yang et al.

Summary: Research has shown that losses at buried interfaces in perovskite photovoltaics are mainly caused by sub-microscale extended imperfections and lead-halide inhomogeneities, which are major obstacles to improving device performance. By utilizing passivation molecules for microstructural reconstruction, these losses can be significantly reduced, unlocking the full potential for enhancing device performance.

ADVANCED MATERIALS (2021)

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Efficient and stable flexible perovskite solar cells based on graphene-AgNWs substrate and carbon electrode without hole transport materials

JunJun Jin et al.

Summary: The study successfully prepared flexible C-PSCs based on carbon electrodes, achieving an optimal efficiency of 9.73% through low-temperature solution process. These devices exhibited superior mechanical robustness and long-term durability compared to their counterparts on flexible ITO/PET substrates.

JOURNAL OF POWER SOURCES (2021)

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Engineering fluorinated-cation containing inverted perovskite solar cells with an efficiency of >21% and improved stability towards humidity

Xiao Wang et al.

Summary: Efficient and stable perovskite solar cells with simple active layers are desirable for manufacturing, but the formation of a two-dimensional component in the perovskite film compromises the performance. In this study, low temperature fabrication of highly efficient and stable inverted solar cells was achieved by adding a fluorinated lead salt, resulting in increased crystal size and orientation, as well as enhanced stability under high humidity conditions.

NATURE COMMUNICATIONS (2021)

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Flexible and efficient perovskite quantum dot solar cells via hybrid interfacial architecture

Long Hu et al.

Summary: All-inorganic CsPbI3 perovskite quantum dots have shown promising efficiency for photovoltaic applications and exhibit better mechanical stability compared to other quantum dot materials. By developing hybrid interfaces, efficient charge transfer and mechanical adhesion can be achieved, leading to higher performance optoelectronic devices.

NATURE COMMUNICATIONS (2021)

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Efficient perovskite solar cells via improved carrier management

Jason J. Yoo et al.

Summary: Metal halide perovskite solar cells have shown great potential to disrupt the silicon solar cell market with their improved performance, yet still face limitations in light-harvesting due to charge carrier recombination. Efforts to enhance charge carrier management offer a path to increase device performance and approach the theoretical efficiency limit of PSCs.

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Interpenetrating interfaces for efficient perovskite solar cells with high operational stability and mechanical robustness

Qingshun Dong et al.

Summary: This study introduces a new approach by incorporating an interpenetrating structure at the electron-transporting-layer interface in perovskite solar cells, enhancing their operational stability and mechanical robustness.

NATURE COMMUNICATIONS (2021)

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Selective Defect Passivation and Topographical Control of 4-Dimethylaminopyridine at Grain Boundary for Efficient and Stable Planar Perovskite Solar Cells

Seulki Song et al.

Summary: The introduction of DMAP in perovskite solar cells has been shown to improve device efficiency and stability by modifying grain boundaries and enhancing adhesion strength between materials.

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Mechanically Robust and Flexible Perovskite Solar Cells via a Printable and Gelatinous Interface

Tangyue Xue et al.

Summary: Researchers have developed a high-quality flexible hole transport layer material PEDOT:GO gel, successfully preparing high-efficiency flexible perovskite solar cells. This gel-like HTL not only exhibits high viscosity, electrical conductivity, and mechanical flexibility, but also maintains over 85% efficiency after 5000 bending cycles, showing great potential for practical applications in portable and wearable electronics.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Spacer Engineering Using Aromatic Formamidinium in 2D/3D Hybrid Perovskites for Highly Efficient Solar Cells

Tingting Liu et al.

Summary: The study demonstrates that aromatic spacers play a crucial role in 2D/3D hybrid perovskites, improving crystalline growth and orientation, reducing defect states, and enhancing spatially resolved carrier lifetime.

ACS NANO (2021)

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Interfacial toughening with self-assembled monolayers enhances perovskite solar cell reliability

Zhenghong Dai et al.

Summary: The use of iodine-terminated self-assembled monolayer (I-SAM) in perovskite solar cells (PSCs) leads to increased adhesion toughness at the interface, improved power conversion efficiency, reduced hysteresis, and enhanced operational stability. This is attributed to a decrease in hydroxyl groups at the interface and higher interfacial toughness achieved with I-SAM treatment.

SCIENCE (2021)

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The poly(styrene-co-acrylonitrile) polymer assisted preparation of high-performance inverted perovskite solar cells with efficiency exceeding 22%

Jiabao Yang et al.

Summary: The solution treatment of perovskite films introduces defects in the grain boundaries, affecting the efficiency and stability of perovskite solar cells. By synthesizing the PS-PAN polymer and incorporating it into the perovskite film, the efficiency of the solar cells is significantly improved and maintained under various environmental conditions.

NANO ENERGY (2021)

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Strain-relaxed tetragonal MAPbI3 results in efficient mesoporous solar cells

Tao Ye et al.

Summary: By employing a buffer layer technique between mesoporous TiO2 and perovskite, relaxed and high-purity tetragonal phase MAPbI(3) was achieved near the interface, significantly improving the performance and stability of the solar cell.

NANO ENERGY (2021)

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Cementitious grain-boundary passivation for flexible perovskite solar cells with superior environmental stability and mechanical robustness

Xiaotian Hu et al.

Summary: This research improved the waterproofness and flexibility of flexible perovskite solar cells by constructing cementitious grain boundaries using s-GO, achieving a high power conversion efficiency of 20.56%. The devices treated with s-GO retained 90% of their initial efficiency after being stored for 180 days in ambient conditions.

SCIENCE BULLETIN (2021)

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Multifunctional Chemical Bridge and Defect Passivation for Highly Efficient Inverted Perovskite Solar Cells

Qisen Zhou et al.

Summary: By constructing a chemical bridge at the interface of PTAA/perovskites, interfacial recombination of charge carriers is minimized, leading to improved efficiency and negligible hysteresis in inverted perovskite solar cells.

ACS ENERGY LETTERS (2021)

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A Highly Tolerant Printing for Scalable and Flexible Perovskite Solar Cells

Zhi Xing et al.

Summary: This study successfully improved the efficiency and air stability of flexible perovskite solar cells by introducing methylammonium acetate as ink assistant and 4-chlorobenzenesulfonic acid as a passivation layer on the perovskite interface.

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Sandwiched electrode buffer for efficient and stable perovskite solar cells with dual back surface fields

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Summary: The research utilized sandwiched electrode buffer technology to enhance the efficiency and stability of perovskite solar cells, leading to improved performance of PSCs in practical applications.
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Flexible perovskite solar cells with simultaneously improved efficiency, operational stability, and mechanical reliability

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Printable and Homogeneous NiOx Hole Transport Layers Prepared by a Polymer-Network Gel Method for Large-Area and Flexible Perovskite Solar Cells

Shaohua Zhang et al.

Summary: This study presents a strategy to synthesize NiOx NPs with high crystallinity and good dispersibility through the polymer network micro-precipitation method, effectively alleviating the aggregation issue of NiOx NPs. The addition of ionic liquid not only inhibits the secondary aggregation of NiOx NPs, but also significantly enhances the properties of the colloidal solution. NiOx HTLs based on this technique achieve high power conversion efficiency on both flexible and rigid substrates.

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Engineering electrodes and metal halide perovskite materials for flexible/stretchable perovskite solar cells and light-emitting diodes

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Summary: Techniques for controlling the optical, electrical, and mechanical properties of metal halide perovskites suitable for flexible and stretchable applications are described, along with discussions on candidates for flexible and stretchable electrode materials such as conducting polymers, low-dimensional carbon materials, and structured metals and their composites.

ENERGY & ENVIRONMENTAL SCIENCE (2021)

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Artemisinin-passivated mixed-cation perovskite films for durable flexible perovskite solar cells with over 21% efficiency

Longkai Yang et al.

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Junming Li et al.

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Xiangchuan Meng et al.

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Sebastian Reichert et al.

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Longkai Yangi et al.

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Md Shahiduzzaman et al.

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High-Performance Flexible Perovskite Solar Cells via Precise Control of Electron Transport Layer

Keqing Huang et al.

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Interfacial Modification in Organic and Perovskite Solar Cells

Shiqing Bi et al.

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Tae-Hee Han et al.

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Recent advancements in and perspectives on flexible hybrid perovskite solar cells

Jin Hyuck Heo et al.

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Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy

Jiangshan Feng et al.

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A review on morphology engineering for highly efficient and stable hybrid perovskite solar cells

Yang Li et al.

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High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2

Dong Yang et al.

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Silver-Hamill Turren-Cruz et al.

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