Organic–inorganic hybrid cathode interlayer materials for efficient organic solar cells

Zhang, Yuefeng; Li, Meng-Di; Fang, Jie; Xia, Dongdong; You, Shengyong; Zhao, Chaowei; Zhang, Jicai; Li, Weiwei

doi:10.1039/d2se00755j

Cited by 4 publications

(4 citation statements)

References 148 publications

(170 reference statements)

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“…From Figure 3b, it is obvious that compared to the pristine PBDB‐T:ITIC active layer, the normalized peak areas of O atoms in PFN‐Br‐ and PFN‐Br:VML‐coated active layers are elevated from 0.55 to 0.86 and 0.88, respectively. [ 60–62 ] Synchronously, the normalized peak areas of N atoms in PFN‐Br‐ and PFN‐Br:VML‐coated active layers sharply increased from 0.054 to 0.35 (PFN‐Br) and 0.43 (PFN‐Br:VML), respectively, indicative of a remarkable molecular shift on the surface of PBDB‐T:ITIC active layers induced by PFN‐Br‐ and PFN‐Br:VML electron transport layers. The larger enrichment on O and N atoms of the PFN‐Br:VML‐coated active layer suggests enhanced electron extraction from the PBDB‐T:ITIC active layer to the CIL than that in the PFN‐Br‐coated active layer.…”

Section: Resultsmentioning

confidence: 99%

“…From Figure 3b, it is obvious that compared to the pristine PBDB-T:ITIC active layer, the normalized peak areas of O atoms in PFN-Br-and PFN-Br:VML-coated active layers are elevated from 0.55 to 0.86 and 0.88, respectively. [60][61][62] Simultaneously, the intertwining of side chains of VML and PFN-Br enhances the non-covalent interactions between VML and N atoms of PFN-Br molecules. In Figure 4c,d, E 1 and E 2 represent the interaction energy between two PFN-Br molecules, with smaller values indicating stronger non-covalent interactions.…”

Section: Mechanism Analysis Of Vml On Pfn-br Interlayermentioning

confidence: 99%

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Non‐Covalent Interaction Enhancement on Active/Interfacial Layers via Two‐Dimensional Vermiculite Doping for Efficient Organic Solar Cells

Ding,

Huang

et al. 2024

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Interface modification plays an important role in improving the power conversion efficiency (PCE) of organic solar cells (OSCs). However, the low non‐covalent interaction between the cathode interface layer (CIL) and nonfullerene acceptor (NFA) directly affects the charge collection of OSCs. Here, the non‐covalent interaction between the CIL and NFA is enhanced by introducing the 2D vermiculite (VML) in the poly(9,9‐bis(3′‐(N,N‐dimethyl)‐Nethylammonium‐propyl‐2,7‐fluorene)‐alt‐2,7‐(9,9‐dioctylfluorene)) dibromide (PFN‐Br) interface layer to form an efficient electron transport channel. As a result, the electron extraction efficiency from the active layer to the CIL is increased, and the PCE of OSCs based on PBDB‐T:ITIC is boosted from 10.87% to 12.89%. In addition, the strategy of CIL doping VML is proven to be universal in different CIL materials, for which the PCE is boosted from 10.21% to 11.57% for OSCs based on PDINN and from 9.82% to 11.27% for OSCs based on PNDIT‐F3N. The results provide a viable option for designing efficient CIL for high‐performance non‐fullerene OSCs, which may promote the commercialization of OSCs.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanism Analysis Of Vml On Pfn-br Interlayermentioning

confidence: 99%

Non‐Covalent Interaction Enhancement on Active/Interfacial Layers via Two‐Dimensional Vermiculite Doping for Efficient Organic Solar Cells

Ding,

Huang

et al. 2024

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“…In an OSC device, the hole‐transporting layer (HTL) plays a crucial role in determining the overall performance, including terms of both the PCE and long‐term stability. [ 45‐50 ] However, in comparison to the significant progress made for the photoactive layer materials, research on interfacial layers, in particular HTL has been far lagged behind. To date, commonly used HTL materials include inorganic and organic materials, and organic HTL materials consist of polymer and small molecular materials.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Vanadyl Sulfate Based Hole‐Transporting Layer Enables Efficient Organic Solar Cells

Li,

Sun,

Cheng

et al. 2024

Chin. J. Chem.

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Comprehensive SummaryIt remains an urgent task to develop alternative hole‐transporting layer (HTL) materials beyond commonly used PEDOT:PSS to increase the shelf‐life of organic solar cells (OSCs). Inorganic metal oxide type materials, such as NiOx, CoOx and VOx, with suitable work functions have attracted numerous research attention recently. In this work, more abundant and easily accessible oxygenated salt, vanadyl sulfate (VOSO4) has been demonstrated to be excellent choice as HTL for OSCs. The VOSO4‐based HTL can be readily processed by spin‐coating from the precursor solution with subsequent thermal annealing and UVO treatment. As a consequence, a high power conversion efficiency (PCE) of 18.72% can be achieved for PM8:L8‐BO based OSCs with the VOSO4‐based HTL. High transmittance, smooth film surface, suitable energy level and high conductivity were revealed to contribute to the high OSC performance. More importantly, compared to device with PEDOT:PSS, VOSO4‐based OSCs exhibit improved stability when stored in the N2 filled glove box. After being stored for 600 h, VOSO4‐based device can retain 89% of its initial efficiency. Notably, VOSO4 can be used as general HTL in PM6:BTP‐BO‐4Cl and PM6:IT‐4F based OSCs, yielding high PCEs of 17.87% and 13.85%, respectively.

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“…In this process, the ETL plays a crucial role, as it not only affects the electron collection and transport but also influences the morphology and energy-level alignment of the active layer. [7] At present, the commonly used ETL materials include inorganic metal oxides, such as ZnO, TiO 2 , SnO 2 , etc. [8][9][10][11][12][13][14][15][16] These materials have the advantages of high conductivity and electron mobility, as well as high chemical stability, etc., and have achieved high efficiency in OSCs.…”

Section: Introductionmentioning

confidence: 99%

Ferrocene‐Terminated Perylene Diimide‐Based Small Molecular Electrolyte as Electron‐Transport Layer for Efficient Organic Solar Cells

Chen,

Xia,

et al. 2023

Solar RRL

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The electron‐transport layer (ETL) is essential for achieving high performance and stability of organic solar cells (OSCs). However, most organic ETLs suffer from low conductivity, low electron mobility, and difficult modification, resulting in mitigation of charge collection and transport. Metal–organic complex, such as ferrocene, is a promising candidate to improve organic ETL due to their excellent film‐forming property, easy preparation, and high electrical properties. Herein, a small molecule, PDIN‐Fc, based on PDIN modified by ferrocene is designed, which can be synthesized by environmentally friendly esterification and quaternization reactions. PDIN‐Fc displays outstanding alcohol solubility and tunable work function. Interestingly, introducing the ferrocene group can lead to increased self‐doping of PDIN‐Fc. As a result, PDIN‐Fc shows significantly improved charge transport performance and conductivity compared to PDIN. When using PM6:L8‐BO as the photoactive layer, the OSCs with PDIN‐Fc as ETL achieve a remarkable power conversion efficiency of 18.45% and exhibit notable high light stability. This study demonstrates an effective strategy to design efficient ETLs by incorporating metal complexes, which enable thickness insensitivity, good stability, and high‐performance photovoltaic devices.

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Organic–inorganic hybrid cathode interlayer materials for efficient organic solar cells

Abstract: Organic solar cells (OSCs) have witnessed great progress over past years. Various breakthroughs, such as record power conversion efficiencies of single junction or tandem OSCs, high performing flexible devices and...

Cited by 4 publications

References 148 publications

Non‐Covalent Interaction Enhancement on Active/Interfacial Layers via Two‐Dimensional Vermiculite Doping for Efficient Organic Solar Cells

Non‐Covalent Interaction Enhancement on Active/Interfacial Layers via Two‐Dimensional Vermiculite Doping for Efficient Organic Solar Cells

Vanadyl Sulfate Based Hole‐Transporting Layer Enables Efficient Organic Solar Cells

Ferrocene‐Terminated Perylene Diimide‐Based Small Molecular Electrolyte as Electron‐Transport Layer for Efficient Organic Solar Cells

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