Homogeneous phase separation in polymer:fullerene bulk heterojunction organic solar cells

Xu, Wei-Long; Wu, Bo; Zheng, Fei; Wang, Huabin; Wang, Yuzhu; Bian, Fenggang; Hao, Xiaotao; Zhu, Furong

doi:10.1016/j.orgel.2015.06.042

Cited by 33 publications

(17 citation statements)

References 43 publications

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“…Steadystate PL measurements were performed with a PG2000-Pro-EX spectrometer with the excitation wavelength of 400 nm. Time-resolved uorescence characterization was performed using the uorescence up-conversion technique [11][12][13][14] . Tested solar cell devices were prepared by spin-coating P3HT (or blended P3HT: ZnO NPs) solutions directly onto ITO glass or to ZnO NRs array which grew on ITO glass.…”

Section: Methodsmentioning

confidence: 99%

Photophysical Behaviors at Interfaces between Poly(3-Hexylthiophene) and Zinc Oxide Nanostructures

Feng

Hao

2017

Mater. Trans.

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Development of design rules through understanding exciton dissociation and charge generation dynamics is an important pathway to improve the performance of hybrid inorganic-organic solar cells. In this work, we study the photophysical behavior and dynamics of charge generation in organic/inorganic hybrid based on poly(3-hexylthiophene) (P3HT) and zinc oxide (ZnO) nanostructures by steady-state and time-resolved uorescence spectroscopy. Both lms of P3HT:ZnO nanoparticle (NPs) blend as the active layer and pristine P3HT as the active layer on ZnO nanorod (NRs) array buffer layer can provide ef cient interfaces for exciton dissociation and charge transfer. P3HT can in ltrate into inter-rod space of ZnO NRs and cover them to enhance the 0-0 band against the 0-1 one in the steady-state photoluminescence spectrum. However, the con guration of P3HT: ZnO NPs blend as the active layer on ZnO NRs buffer layer poorly further improves the exciton dissociation, due to the decreased organic-inorganic interface area.

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Section: Methodsmentioning

confidence: 99%

Photophysical Behaviors at Interfaces between Poly(3-Hexylthiophene) and Zinc Oxide Nanostructures

Feng

Hao

2017

Mater. Trans.

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“…Conversely, BHJs permit to increase the interfacial area and reduce the dimension of the isles produced by each phase, contributing to the efficient charge extraction. However, the production of a BHJ cannot be precisely ruled: After mixing donor and acceptor in a single solution and letting them phase-separate during film formation, a thermodynamically driven process emerges, where some isolated microphases (from both D-and A-materials) grow distantly from each other and surrounded by bulk mixture [87], thus making the photogenerated charge carriers unable to move to the external electrodes. The ideal morphology for BHJ in OPVs can be visualized as a bi-continuous interpenetrating network, whose interface resembles a herringbone pattern [88], as pictorially described in Figure 1.…”

Section: The Donor/acceptor Interface (D/a-i) -Morphological Propertimentioning

confidence: 99%

“…Consequently, the increased D/A-I area promotes a more efficient generation of charge carriers [ 193 , 194 ]. The dimension of PCBM nanoaggregates formed in the presence of DIO is widely documented, using several techniques, such as AFM [ 87 ] and soft X-ray scattering studies [ 195 ].…”

Section: The Compatibilizersmentioning

confidence: 99%

Tackling Performance Challenges in Organic Photovoltaics: An Overview about Compatibilizers

et al. 2020

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Organic Photovoltaics (OPVs) based on Bulk Heterojunction (BHJ) blends are a mature technology. Having started their intensive development two decades ago, their low cost, processability and flexibility rapidly funneled the interest of the scientific community, searching for new solutions to expand solar photovoltaics market and promote sustainable development. However, their robust implementation is hampered by some issues, concerning the choice of the donor/acceptor materials, the device thermal/photo-stability, and, last but not least, their morphology. Indeed, the morphological profile of BHJs has a strong impact over charge generation, collection, and recombination processes; control over nano/microstructural morphology would be desirable, aiming at finely tuning the device performance and overcoming those previously mentioned critical issues. The employ of compatibilizers has emerged as a promising, economically sustainable, and widely applicable approach for the donor/acceptor interface (D/A-I) optimization. Thus, improvements in the global performance of the devices can be achieved without making use of more complex architectures. Even though several materials have been deeply documented and reported as effective compatibilizing agents, scientific reports are quite fragmentary. Here we would like to offer a panoramic overview of the literature on compatibilizers, focusing on the progression documented in the last decade.

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“…The chemically-bonded Ag-P3HT, however, exhibited a much faster decay lifetime of 358 ps which is attributed to the relaxation of singlet-state excitons [30]. Unlike the physically mixed Ag/P3HT, in Ag-P3HT metal NPs and P3HT chains are held in proximity via the stable chemical bond, facilitating the dissociation of excitons and charge transfer [31]. This is similar to the processes in a copolymer [32], except that the separate phase domain of Ag-P3HT is much larger than the one in a copolymer.…”

Section: Luminescent Properties Of Ag-p3htmentioning

confidence: 99%

“…However, the decay time was observed to be much smaller for Ag-P3HT than for P3HT. The shorter decay time can possibly be associated with the energy transfer from the excited state of P3HT to the surface plasmon resonance (SPR) state of silver NPs [33], in addition to the above mentioned interchain interactions and proximity due to the linking chemical bond [30,31].…”

Section: Luminescent Properties Of Ag-p3htmentioning

confidence: 99%

Efficient photoinduced charge transfer in chemically-linked organic-metal Ag-P3HT nanocomposites

Feng

Chen

Zheng

et al. 2016

Opt. Mater. Express

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Abstract:A novel nanocomposite of P3HT and Ag nanoparticles (Ag-P3HT) has been synthesized by laser ablation. The fluorescence wavelength of the nanocomposite can be tuned by varying the ablation duration. The steady-state emission maximum at 580 nm for pristine P3HT shows significant blueshift to wavelengths ranging from 520 to 550 nm for Ag-P3HT. NMR, FTIR and XPS spectroscopy confirm that chemical links are formed between P3HT and silver nanoparticles (NPs) in the nanocomposite. For the sample with an emission maximum at 530 nm, 1 H NMR spectra indicate that 66% of the P3HT thiophene ring protons are replaced by Ag NPs. Time-resolved spectroscopy demonstrates that charge transfer efficiency increases for Ag-P3HT and this is attributed to the enhanced intimate interfacial contact between the chemically-bonded metal NPs and polymer chains. The synthetic route outlined provides a one-pot and green strategy for producing metal-organic polymeric materials, with controlled luminescence wavelengths and efficient photoinduced charge transfer that meet the requirement for developing high-performance organic light-emitting and photovoltaic devices.

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Homogeneous phase separation in polymer:fullerene bulk heterojunction organic solar cells

Cited by 33 publications

References 43 publications

Photophysical Behaviors at Interfaces between Poly(3-Hexylthiophene) and Zinc Oxide Nanostructures

Photophysical Behaviors at Interfaces between Poly(3-Hexylthiophene) and Zinc Oxide Nanostructures

Tackling Performance Challenges in Organic Photovoltaics: An Overview about Compatibilizers

Efficient photoinduced charge transfer in chemically-linked organic-metal Ag-P3HT nanocomposites

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