Investigations into Ag nanoparticles–carbon–poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) composite: morphological, structural, optical, and electrical characterization

Rajamanickam, Suvindraj; Mohammad, Sabah M.; Hassan, Z.; Omar, Ahmad; Muhammad, A.

doi:10.1007/s00289-021-03938-w

“…Figure 5 compares the spectra of the films with NCP and AgNP with the spectra of the powder and film (inset) copolymer. For the PDOF-co-PEDOT pure (powder), the most intense band is located at 1605 cm −1 , being assigned to the phenyl intra-ring C-C stretch mode of the fluorene group [ 6 , 42 , 43 ]. The other less intense bands are listed in Table 3 with their respective attributions.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the preparation of polymeric films with an ordering degree can provide an improvement in the properties of CPs [ 1 ]. Among the most used techniques for the formation of these films are Spin Coating [ 4 , 5 ] and Drop-Casting [ 5 , 6 ], which are simple techniques based on the coating of solid supports by centrifugal force or solvent evaporation, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Nanocomposite Films of Silver Nanoparticles and Conjugated Copolymer in Natural and Nano-Form: Structural and Morphological Studies

Rodrigues

¹

,

Pellosi

²

,

Louarn

³

et al. 2023

Materials

4

0

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The use of conjugated polymers (CPs) and metallic nanoparticles is an interesting way to form nanocomposites with improved optical properties. For instance, a nanocomposite with high sensitivity can be produced. However, the hydrophobicity of CPs may hamper applications due to their low bioavailability and low operability in aqueous media. This problem can be overcome by forming thin solid films from an aqueous dispersion containing small CP nanoparticles. So, in this work we developed the formation of thin films of poly(9,9-dioctylfluorene-co-3,4-ethylenedioxythiophene) (PDOF-co-PEDOT) from its natural and nano form (NCP) from aqueous solution. These copolymers were then blended in films with triangular and spherical silver nanoparticles (AgNP) for future applicability as a SERS sensor of pesticides. TEM characterization showed that the AgNP were adsorbed on the NCP surface, forming a nanostructure with an average diameter of 90 nm (value according to that obtained by DLS) and with a negative potential zeta. These nanostructures were transferred to a solid substrate, forming thin and homogeneous films with different morphology of PDOF-co-PEDOT films, as observed by atomic force microscopy (AFM). XPS data demonstrated the presence of the AgNP in the thin films, as well as evidence that films with NCP are more resistant to the photo-oxidation process. Raman spectra showed characteristic peaks of the copolymer in the films prepared with NCP. It should also be noted the enhancement effect of Raman bands observed on films containing AgNP, a strong indication of the SERS effect induced by the metallic nanoparticles. Furthermore, the different geometry of the AgNP influences the way in which the adsorption between the NCP and the metal surface occurs, with a perpendicular adsorption between the NCP chains and the surface of the triangular AgNP.

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Hierarchical Solid‐Additive Strategy for Achieving Layer‐by‐Layer Organic Solar Cells with Over 19 % Efficiency

Chen,

Bian,

Yang

et al. 2024

Angewandte Chemie

1

0

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Layer‐by‐layer (LbL) deposition of active layers in organic solar cells (OSCs) offers immense potential for optimizing performance through precise tailoring of each layer. However, achieving high‐performance LbL OSCs with distinct solid additives in each layer remains challenging. In this study, we explore a novel approach that strategically incorporates different solid additives into specific layers of LbL devices. To this end, we introduce FeCl3 into the lower donor (D18) layer as a p‐type dopant to enhance hole concentration and mobility. Concurrently, we incorporate the wide‐bandgap conjugated polymer poly(9,9‐di‐n‐octylfluorenyl‐2,7‐diyl) (PFO) into the upper acceptor (L8‐BO) layer to improve the morphology and prolong exciton lifetime. Unlike previous studies, our approach combines these two strategies to achieve higher and more balanced electron and hole mobility without affecting device open‐circuit voltage, while also suppressing charge recombination. Consequently, the power conversion efficiency (PCE) of the D18+FeCl3/L8‐BO device increases to 18.12%, while the D18/L8‐BO+PFO device attains a PCE of 18.79%. These values represent substantial improvements over the control device's PCE of 17.59%. Notably, when both FeCl3 and PFO are incorporated, the D18+FeCl3/L8‐BO+PFO device achieves a remarkable PCE of 19.17%. In summary, our research results demonstrate the effectiveness of the layered solid additive strategy in improving OSC performance.

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Hierarchical Solid‐Additive Strategy for Achieving Layer‐by‐Layer Organic Solar Cells with Over 19 % Efficiency

Chen,

Bian,

Yang

et al. 2024

Angew Chem Int Ed

4

0

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Layer‐by‐layer (LbL) deposition of active layers in organic solar cells (OSCs) offers immense potential for optimizing performance through precise tailoring of each layer. However, achieving high‐performance LbL OSCs with distinct solid additives in each layer remains challenging. In this study, we explore a novel approach that strategically incorporates different solid additives into specific layers of LbL devices. To this end, we introduce FeCl3 into the lower donor (D18) layer as a p‐type dopant to enhance hole concentration and mobility. Concurrently, we incorporate the wide‐bandgap conjugated polymer poly(9,9‐di‐n‐octylfluorenyl‐2,7‐diyl) (PFO) into the upper acceptor (L8‐BO) layer to improve the morphology and prolong exciton lifetime. Unlike previous studies, our approach combines these two strategies to achieve higher and more balanced electron and hole mobility without affecting device open‐circuit voltage, while also suppressing charge recombination. Consequently, the power conversion efficiency (PCE) of the D18+FeCl3/L8‐BO device increases to 18.12%, while the D18/L8‐BO+PFO device attains a PCE of 18.79%. These values represent substantial improvements over the control device's PCE of 17.59%. Notably, when both FeCl3 and PFO are incorporated, the D18+FeCl3/L8‐BO+PFO device achieves a remarkable PCE of 19.17%. In summary, our research results demonstrate the effectiveness of the layered solid additive strategy in improving OSC performance.

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Investigations into Ag nanoparticles–carbon–poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) composite: morphological, structural, optical, and electrical characterization

Cited by 6 publications

References 48 publications

Nanocomposite Films of Silver Nanoparticles and Conjugated Copolymer in Natural and Nano-Form: Structural and Morphological Studies

Nanocomposite Films of Silver Nanoparticles and Conjugated Copolymer in Natural and Nano-Form: Structural and Morphological Studies

Hierarchical Solid‐Additive Strategy for Achieving Layer‐by‐Layer Organic Solar Cells with Over 19 % Efficiency

Hierarchical Solid‐Additive Strategy for Achieving Layer‐by‐Layer Organic Solar Cells with Over 19 % Efficiency

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