Annealing effect on donor-acceptor interface and its impact on the performance of organic photovoltaic devices based on PSiF-DBT copolymer and C60

Marchiori, Cleber F. N.; Yamamoto, Natasha A. D.; Matos, Carolina Ferreira de; Kujala, Janne V.; Macedo, Andréia G.; Tuomisto, Filip; Zarbin, Aldo J. G.; Koehler, Marlus; Roman, Lucimara S.

doi:10.1063/1.4916515

Cited by 13 publications

(9 citation statements)

References 33 publications

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“…Another key-point to understand the photovoltaic properties of our devices is that the PSiF-DBT is able to form very packed thin films even without any thermal annealing treatment. Using the Positron Annihilation Spectroscopy (PAS) technique, [51] we showed recently that the material packing does not change even when the PSIF-DBT films are submitted to annealing at temperatures up to 200°C. As a consequence, the thermal annealing is able to induce only a modest rise of the effective hole mobility in the PSIF-DBT film.…”

Section: The Psif-dbt Layermentioning

confidence: 99%

“…However, an improvement in J SC of photovoltaic devices (and consequently in PCE) was achieved when the PSiF-DBT layer was submitted to the annealing process prior to the acceptor deposition. This effect was attributed to the roughness increase of the polymeric surface which (i) provides an enhanced donor/ acceptor contact area and (ii) assists the fullerene diffusion creating an mixed layer close to the so called bulk heterojunction [51] . The surface roughness enhancement after annealing will be revisited here to discuss the effects originated from different diffusivities of the C 60 and C 70 into the polymeric layer.…”

Section: The Psif-dbt Layermentioning

confidence: 99%

“…On the other hand, the increase of J SC is considerably lower for the device with C 70 (62%). The rise of J SC upon annealing can be attributed to the increase in the PSiF-DBT film's roughness [51] . The easier diffusion of the acceptor into the polymeric film increases then the donor/acceptor (D/A) contact area for exciton dissociation.…”

Section: Psif-dbt/c 60(70) Organic Photovoltaic Devicesmentioning

confidence: 99%

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Comparing C60 and C70 as acceptor in organic solar cells: Influence of the electronic structure and aggregation size on the photovoltaic characteristics

et al. 2020

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The difference in aggregation size of the C 60 and C 70 fullerenes affect the photovoltaic performance of devices assembled in the so-called bilayer architecture with poly[2,7-(9,9-dioctyl-dibenzosilole)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PSiF-DBT) as the electron donor material. Despite the better performance of the C 70 devices, which is related to the high absorption coefficient in the visible range and the superior charge transport properties, the short-circuit current variation upon annealing treatment at 100°C is approximately twice bigger when the C 60 is the acceptor. We attribute this effect to the tendency of C 60 in form smaller aggregate domains relatively to the C 70. The increased roughness on the polymeric surface after annealing results in an enhanced donor/acceptor contact area and assists the fullerene diffusion deeper inside the polymeric layer. This effect leads to a better mixing between donor and acceptor species and create a interpenetrating layer close to the so-called bulk heterojunction. Since C 60 forms smaller aggregates, this mechanism is more pronounced for this molecule. Therefore, a significant variation in the performance of the C 60 devices is observed after this kind of treatment. Density Functional Theory calculations of the potential energy of interaction between two fullerene molecules and X-Ray measurements gives evidences to support this idea. In addition, combining spectrally resolved external quantum efficiency measurements with optical modeling our results also indicate the occurrence of the bilayer interfacial mixing for PSiF-DBT/C 60 .

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Section: The Psif-dbt Layermentioning

confidence: 99%

Section: The Psif-dbt Layermentioning

confidence: 99%

Section: Psif-dbt/c 60(70) Organic Photovoltaic Devicesmentioning

confidence: 99%

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Comparing C60 and C70 as acceptor in organic solar cells: Influence of the electronic structure and aggregation size on the photovoltaic characteristics

et al. 2020

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“…As reported, the efficiency of a bilayer device can be enhanced through a change in the electrondonor/acceptor interface. 30,41 To investigate this phenomenon, film topography was characterized by AFM measurement (Figure 3c). It is possible to verify that the root-mean-square of the mixture is higher than that of pristine material.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Nonradiative Energy Transfer between Porphyrin and Copolymer in Films Processed by Organic Solvent and Water-Dispersible Nanoparticles with Photovoltaic Applications

et al. 2018

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In organic photovoltaic (OPV) devices, one way to increase light harvesting is to combine materials with complementary absorptions. However, the physical properties behind this process, such as Förster resonance energy transfer (FRET), remain elusive. A mixture of the metalloporphyrin Zn(5BrTTP) and the donor–acceptor copolymer PSiF-DBT in films processed by organic solvent and water-soluble nanoparticles was investigated, and the energy-transfer rate was correlated to the bilayer of an OPV device with a fullerene derivative (C70). Using steady-state and time-resolved emission studies, the FRET from the porphyrin to the copolymer was observed and found to be highest in the film processed by organic-solvent treatment at 100 °C. The devices processed by organic solvents showed superior performance to blended materials when treated at 100 °C, increasing the current without reducing open-circuit voltage. In nanoparticle systems, we observed that, with a smaller distance between the materials, higher FRET is performed. The device’s performance showed higher current as the materials were closer together. To go beyond materials with complementary absorption, the optimization of energy transfer between them might be a promising way to increase charge generation in photovoltaic devices with different morphologies.

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“…Como é de interesse aumentar a interface entre o polímero doador e aceitador da blenda a fim de ter uma maior geração de portadores, a pesquisa por misturas com essas características são grandes. A Figura 3.9 mostra alguns diferentes tipos de interface entre o polímero aceitador e doador na mistura.Os dispositivos bulk-heterojunção mais estudados e frequentemente reportados na literatura são os que consistem da blenda de um polímero doador de elétrons e um fulereno como aceitador[4, 28,34,35,[37][38][39]. O material mais comumente usado como aceitador e com vários artigos publicados é o[6,6]-fenil-C61-ácido butírico-metil éster (PCBM), que Foi utilizado um cantilever comercial de silício dopado com antimônio.…”

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Célula fotovoltaica orgânica de heterojunção de Poli (3-Hexiltiofeno) (P3HT) e P(NDI20D-T2) (N2200) : preparação e caracterização

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Agradeço primeiramente a Deus, pois sem ele não haveria coragem para eu enfrentar esse grande desafio. À minha mãe Gorett e ao meu pai Ernesto por terem acreditado e confiado em mim durante esses dois anos. Sem eles não seria possível! Aos meus irmãos, Tales e Thaís, à minha família e aos meus amigos por me apoiarem e me incentivarem a sempre concluir meus objetivos. À minha orientadora, professora Artemis, pela dedicação, paciência, disponibilidade e também por confiar em meu trabalho. À professora Lucimara e aos pesquisadores do Laboratório de Dispositivos Nanoestruturados (DINE) do Instituto de Física da Universidade Federal do Paraná, pela oportunidade de desenvolvimento de parte do meu trabalho e pelos conhecimentos compartilhados. À professora Nizamara pelas valiosíssimas dicas de como ser um pós-graduando, pelas contribuições ao meu trabalho e pelo conhecimento que me passou durante o meu mestrado. Aos meus colegas de laboratório, Vilany e Rafael, pela amizade, conhecimentos trocados, pelo apoio psicológico e pelas horas de descontração. Ao pessoal da secretaria do PGEA, em especial Adriana pela presteza nas minhas solicitações. À CAPES e ao CNPq pelo apoio financeiro durante o curso. Obrigado! v Dedico este trabalho às minhas professoras: minha mãe Gorett e minha avó Das Dôres.

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Annealing effect on donor-acceptor interface and its impact on the performance of organic photovoltaic devices based on PSiF-DBT copolymer and C60

Cited by 13 publications

References 33 publications

Comparing C60 and C70 as acceptor in organic solar cells: Influence of the electronic structure and aggregation size on the photovoltaic characteristics

Comparing C60 and C70 as acceptor in organic solar cells: Influence of the electronic structure and aggregation size on the photovoltaic characteristics

Nonradiative Energy Transfer between Porphyrin and Copolymer in Films Processed by Organic Solvent and Water-Dispersible Nanoparticles with Photovoltaic Applications

Célula fotovoltaica orgânica de heterojunção de Poli (3-Hexiltiofeno) (P3HT) e P(NDI20D-T2) (N2200) : preparação e caracterização

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