Morphological study of F8BT:PFB thin film blends

Abdulla, Mayami; Renero-Lecuna, Carlos; Kim, J.S.; Friend, Richard H.

doi:10.1016/j.orgel.2015.04.002

Cited by 8 publications

(5 citation statements)

References 55 publications

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“…Another trend for continued OPV research involves significant efforts to replace the fullerene derivative acceptors that have long dominated devices with champion performance to polymer:polymer blends, as well as small-molecule materials and other n-type organic semiconductors. − This offers further means to tune the interfacial and electro-optical properties, providing a current impetus for investigating also the influence of these alternative material combinations on electron dynamics. Early work by Offermans et al on a binary mixture of the two polymers MDMO-PPV and PCNEPV showed that a luminescent CT state, an exciplex, is formed upon excitation of either polymer.…”

Section: Solar Cell Technologiesmentioning

confidence: 99%

Ultrafast Electron Dynamics in Solar Energy Conversion

2017

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Electrons are the workhorses of solar energy conversion. Conversion of the energy of light to electricity in photovoltaics, or to energy-rich molecules (solar fuel) through photocatalytic processes, invariably starts with photoinduced generation of energy-rich electrons. The harvesting of these electrons in practical devices rests on a series of electron transfer processes whose dynamics and efficiencies determine the function of materials and devices. To capture the energy of a photogenerated electron-hole pair in a solar cell material, charges of opposite sign have to be separated against electrostatic attractions, prevented from recombining and being transported through the active material to electrodes where they can be extracted. In photocatalytic solar fuel production, these electron processes are coupled to chemical reactions leading to storage of the energy of light in chemical bonds. With the focus on the ultrafast time scale, we here discuss the light-induced electron processes underlying the function of several molecular and hybrid materials currently under development for solar energy applications in dye or quantum dot-sensitized solar cells, polymer-fullerene polymer solar cells, organometal halide perovskite solar cells, and finally some photocatalytic systems.

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Section: Solar Cell Technologiesmentioning

confidence: 99%

Ultrafast Electron Dynamics in Solar Energy Conversion

2017

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“…The resultant thin film has an average thickness of about 120 nm and the phase-separation between F8BT-and PFB-rich domains can be clearly resolved by the optical microscopic image under UV excitation, as will be shown in Figure 2a. The mechanisms for the phase-separation in F8BT:PFB blend film have been extensively studied and clearly understood [16][17][18]. The green and blue domains correspond to F8BT-and PFB-rich phases, respectively, where the PFB phase is observed as large holes in the blend film and is more than 30 nm lower than the F8BT.…”

Section: Preparation and Stabilization Of The Template By Selective Cmentioning

confidence: 99%

Broadband Dual-Phase Plasmons through Metallization of Polymeric Heterojunctions

Huang

2017

Metals

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Large-area dual-phase plasmonic gold nanostructures were produced using the phase-separation pattern of a polymer blend film, where two typical light-emitting polymeric semiconductors of poly (9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) and poly (9,9-dioctylfluorene-co-bis-N,N -(4-butylphenyl)-bis-N,N -phenyl-1,4 phenylenediamine) (PFB) have been employed to construct the heterojunction patterns. The laser-induced selective cross-linking of F8BT molecules and the subsequent rinsing process using the good solvent of chloroform for PFB supplies a stable template for a further metallization process. When colloidal gold nanoparticles were spin-coated onto the surface of the template, a majority of the gold nanoparticles were confined into the "holes" of originally PFB-rich phase, while a minor portion stays on the "ridges" of F8BT-rich phase. After the annealing process, larger gold nanoparticles were produced inside the holes and smaller ones on the ridges, which induced localized surface plasmon resonance in the near infrared and in the visible, respectively. The structural parameters of the gold plasmonic pattern can be tuned by different surface modification and annealing processes, which can tune the spectroscopic response in the spectral position and in the spectral intensity. The produced nanostructures with broadband plasmon resonance can be used as a template for random lasers with strong optical scattering at both the pump and emission wavelengths and for photovoltaic devices with strong absorption in the visible and near infrared.

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“…However, blue light at wavelengths longer than 420 nm is only absorbed by F8BT, which facilities selective cross-linking in a blend film. Chemical structures and spectroscopic response of these two polymers have been given in a series of publications [ 12 , 13 , 14 , 15 ].…”

Section: Laser-induced Cross-linking In Polymer Filmmentioning

confidence: 99%

Selective Photophysical Modification on Light-Emitting Polymer Films for Micro- and Nano-Patterning

Liu

2016

Materials

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Laser-induced cross-linking in polymeric semiconductors was utilized to achieve micro- and nano-structuring in thin films. Single- and two-photon cross-linking processes led to the reduction in both the refractive index and thickness of the polymer films. The resultant photonic structures combine the features of both relief- and phase-gratings. Selective cross-linking in polymer blend films based on different optical response of different molecular phases enabled “solidification” of the phase-separation scheme, providing a stable template for further photonic structuring. Dielectric and metallic structures are demonstrated for the fabrication methods using cross-linking in polymer films. Selective cross-linking enables direct patterning into polymer films without introducing additional fabrication procedures or additional materials. The diffraction processes of the emission of the patterned polymeric semiconductors may provide enhanced output coupling for light-emitting diodes or distributed feedback for lasers.

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Morphological study of F8BT:PFB thin film blends

Cited by 8 publications

References 55 publications

Ultrafast Electron Dynamics in Solar Energy Conversion

Ultrafast Electron Dynamics in Solar Energy Conversion

Broadband Dual-Phase Plasmons through Metallization of Polymeric Heterojunctions

Selective Photophysical Modification on Light-Emitting Polymer Films for Micro- and Nano-Patterning

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