scholarly journals Different agglomeration properties of PC61BM and PC71BM in photovoltaic inks – a spin-echo SANS study

RSC Advances ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 4512-4520 ◽  
Author(s):  
Gabriel Bernardo ◽  
Manuel Melle-Franco ◽  
Adam L. Washington ◽  
Robert M. Dalgliesh ◽  
Fankang Li ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Spin Echo ◽  
Electron Acceptors ◽  
Fullerene Derivatives ◽  
Wide Range ◽  
Solution Processable

Fullerene derivatives are used in a wide range of applications including as electron acceptors in solution-processable organic photovoltaics.

Solution-processable fullerene derivatives for organic photovoltaics and n-type thin-film transistors

2011 ◽  
Vol 11 (2) ◽  
pp. e44-e48 ◽  
Author(s):  
Sun Young Nam ◽  
Eun Young Park ◽  
Tae-Dong Kim ◽  
Shinuk Cho ◽  
Jea-Gun Park ◽  
...  
Keyword(s):  
Thin Film ◽  
Organic Photovoltaics ◽  
Thin Film Transistors ◽  
Fullerene Derivatives ◽  
Solution Processable

scholarly journals Gelation or molecular recognition; is the bis-(α,β-dihydroxy ester)s motif an omnigelator?

2010 ◽  
Vol 6 ◽  
pp. 1079-1088 ◽  
Author(s):  
Peter C Griffiths ◽  
David W Knight ◽  
Ian R Morgan ◽  
Amy Ford ◽  
James Brown ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Neutron Scattering ◽  
Spin Echo ◽  
Inelastic Neutron ◽  
Gelation Mechanism ◽  
Regular Structures ◽  
Low Concentrations ◽  
Wide Range ◽  
History Of ◽  
Selection Of

Understanding the gelation of liquids by low molecular weight solutes at low concentrations gives an insight into many molecular recognition phenomena and also offers a simple route to modifying the physical properties of the liquid. Bis-(α,β-dihydroxy ester)s are shown here to gel thermoreversibly a wide range of solvents, raising interesting questions as to the mechanism of gelation. At gelator concentrations of 5–50 mg ml−1, gels were successfully formed in acetone, ethanol/water mixtures, toluene, cyclohexane and chloroform (the latter, albeit at a higher gelator concentration). A range of neutron techniques – in particular small-angle neutron scattering (SANS) – have been employed to probe the structure of a selection of these gels. The universality of gelation in a range of solvent types suggests the gelation mechanism is a feature of the bis-(α,β-dihydroxy ester) motif, with SANS demonstrating the presence of regular structures in the 30–40 Å range. A correlation between the apparent rodlike character of the structures formed and the polarity of the solvent is evident. Preliminary spin-echo neutron scattering studies (SESANS) indicated the absence of any larger scale structures. Inelastic neutron spectroscopy (INS) studies demonstrated that the solvent is largely unaffected by gelation, but does reveal insights into the thermal history of the samples. Further neutron studies of this kind (particularly SESANS and INS) are warranted, and it is hoped that this work will stimulate others to pursue this line of research.

Effects of solvent vapor annealing on organic photovoltaics with a new type of solution-processable oligothiophene-based electronic donor material

2018 ◽  
Vol 57 (8S3) ◽  
pp. 08RE09 ◽  
Author(s):  
Yuki Akiyama ◽  
Hiroaki Tachibana ◽  
Reiko Azumi ◽  
Tetsuhiko Miyadera ◽  
Masayuki Chikamatsu ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Solvent Vapor ◽  
Donor Material ◽  
Vapor Annealing ◽  
New Type ◽  
Solvent Vapor Annealing ◽  
Solution Processable

Solution-processable silicon naphthalocyanine tetraimides as near infrared electron acceptors in organic solar cells

2022 ◽  
Vol 197 ◽  
pp. 109846
Author(s):  
Chunsheng Cai ◽  
Lei Wang ◽  
Ming Hu ◽  
Li Li ◽  
Jubiao Fu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Near Infrared ◽  
Electron Acceptors ◽  
Solution Processable

Tight binding models accurately predict band structures for copolymer semiconductors

2020 ◽  
Vol 22 (35) ◽  
pp. 19659-19671 ◽  
Author(s):  
Prithvi Tipirneni ◽  
Vishal Jindal ◽  
Michael J. Janik ◽  
Scott T. Milner
Keyword(s):  
Conjugated Polymers ◽  
Organic Photovoltaics ◽  
Tight Binding ◽  
Band Gaps ◽  
Active Materials ◽  
Band Structures ◽  
Wide Range ◽  
Binding Models

Conjugated polymers possess a wide range of desirable properties including accessible band gaps, plasticity, tunability, mechanical flexibility and synthetic versatility, making them attractive as active materials in organic photovoltaics (OPVs).

scholarly journals Reshaping Hybrid Perovskites Emission with Flexible Polymer Microcavities

2020 ◽  
Vol 230 ◽  
pp. 00006
Author(s):  
Paola Lova ◽  
Paolo Giusto ◽  
Francesco Di Stasio ◽  
Giovanni Manfredi ◽  
Giuseppe M. Paternò ◽  
...  
Keyword(s):  
Thin Films ◽  
Photonic Crystals ◽  
Low Cost ◽  
Scale Production ◽  
Large Area ◽  
Light Emitting Devices ◽  
Flexible Polymer ◽  
Hybrid Perovskite ◽  
Wide Range ◽  
Solution Processable

Thanks to versatile optoelectronic properties solution processable perovskites have attracted increasing interest as active materials in photovoltaic and light emitting devices. However, the deposition of perovskite thin films necessitates wide range solvents that are incompatible with many other solution-processable media, including polymers that are usually dissolved by the perovskite solvents. In this work, we demonstrate that hybrid perovskite thin films can be coupled with all polymer planar photonic crystals with different approaches to achieve emission intensity enhancement and reshaping using different approaches. The possibility to control and modify the emission spectrum of a solution processable perovskite via a simple spun-cast polymer structure is indeed of great interest in optoelectronic applications requiring high color purity or emission directionality. Furthermore, thanks to the ease of fabrication and scalability of solution-processed photonic crystals, this approach could enable industrial scale production of low-cost, large area, lightweight and flexible polymer-perovskite lighting devices, which may be tuned without resorting to compositional engineering.

scholarly journals A relatively wide-bandgap and air-stable donor polymer for fabrication of efficient semitransparent and tandem organic photovoltaics

2019 ◽  
Vol 116 (44) ◽  
pp. 22037-22043 ◽  
Author(s):  
Mohammad Mahdi Tavakoli ◽  
Riccardo Po ◽  
Gabriele Bianchi ◽  
Alessandra Cominetti ◽  
Chiara Carbonera ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Butyric Acid ◽  
Organic Photovoltaics ◽  
Acid Methyl Ester ◽  
Wide Bandgap ◽  
Open Circuit ◽  
Monolayer Graphene ◽  
Acid Methyl ◽  
Wide Range ◽  
Butyric Acid Methyl Ester

Organic photovoltaics (OPVs) have attracted tremendous attention in the field of thin-film solar cells due to their wide range of applications, especially for semitransparent devices. Here, we synthesize a dithiaindacenone-thiophene-benzothiadiazole-thiophene alternating donor copolymer named poly{[2,7-(5,5-didecyl-5H-1,8-dithia-as-indacenone)]-alt-[5,5-(5′,6′-dioctyloxy-4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]} (PDTIDTBT), which shows a relatively wide bandgap of 1.82 eV, good mobility, and high transmittance and ambient stability. In this work, we fabricate an OPV device using monolayer graphene as top electrode. Due to the stability of PDTIDTBT in air and water, we use a wet transfer technique for graphene to fabricate semitransparent OPVs. We demonstrate OPVs based on the PDTIDTBT:Phenyl-C61/71-butyric acid methyl ester (PCBM) blend with maximum power conversion efficiencies (PCEs) of 6.1 and 4.75% using silver and graphene top electrodes, respectively. Our graphene-based device shows a high average visible transmittance (AVT) of 55%, indicating the potential of PDTIDTBT for window application and tandem devices. Therefore, we also demonstrate tandem devices using the PDTIDTBT:Phenyl-C61-butyric acid methyl ester (PC60BM) blend in both series and parallel connections with average PCEs of 7.3 and 7.95%, respectively. We also achieve a good average PCE of 8.26% with an average open circuit voltage (Voc) of 1.79 V for 2-terminal tandem OPVs using this blend. Based on tandem design, an OPV with PCE of 6.45% and AVT of 38% is demonstrated. Moreover, our devices show improved shelf life and ultraviolet (UV) stability (using CdSe/ZnS core shell quantum dots [QDs]) in ambient with 45% relative humidity.

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