Journal ArticleDOI
New low bandgap near-IR conjugated D-A copolymers for BHJ polymer solar cell applications.
M L Keshtov,Sergei A. Kuklin,N. A. Radychev,Alexander Yu. Nikolaev,I. E. Ostapov,Mikhail M. Krayushkin,I. O. Konstantinov,Emmanuel N. Koukaras,Abhishek Sharma,Ganesh D. Sharma +9 more
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TLDR
Two novel ultra low bandgap donor-acceptor (D-A) copolymers, containing the thiadiazoloquinoxaline unit as the main electron accepting unit and benzodithiophene and dithienosilole as different donor units, are synthesized using the cross-coupling Stille reaction.Abstract:
We synthesized two novel ultra low bandgap donor-acceptor (D-A) copolymers (E(g) ≤ 1.2 eV), containing the thiadiazoloquinoxaline unit as the main electron accepting unit (A) and benzodithiophene (BDT) and dithienosilole (DTS) as different donor units (D), denoted as P1 and P2, respectively, using the cross-coupling Stille reaction. The copolymers possess light absorption ranging from UV (350 nm) to near-IR (1300 nm) with optical bandgaps of 1.16 eV and 1.08 eV, respectively. Quantum-chemical calculations and experimental data were compared for proposing a more detailed concept for the optical and electronic properties of these copolymers which can be used as donors for polymer solar cells (PSCs). The PSCs based on optimized P1:PC71BM and P2:PC71BM showed overall power conversion efficiencies (PCEs) of 4.32% and 3.48%, respectively. Although P2 possesses a broad absorption coverage of up to 1300 nm, the lower PCE may be attributed to the low J(sc), due to the poor driving force for exciton dissociation, since the LUMO offset with PC71BM is less than 0.3 eV. The PCE has been significantly increased to 7.27% and 6.68% for solvent vapor annealing (SVA) treated P1:PC71BM and P2:PC71BM active layers, respectively. This improvement arises from the appropriate nanoscale morphology and an increase in hole mobility, induced by the SVA treatment of the active layers.read more
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Journal ArticleDOI
Alkylated Selenophene-Based Ladder-Type Monomers via a Facile Route for High-Performance Thin-Film Transistor Applications
Zhuping Fei,Yang Han,Eliot Gann,Thomas Hodsden,Anthony S. R. Chesman,Christopher R. McNeill,Thomas D. Anthopoulos,Martin Heeney +7 more
TL;DR: Two new selenophene-containing ladder-type monomers are synthesised via a 2-fold and 4-fold Pd-catalyzed coupling with a 1,1-diborylmethane derivative to afford materials which exhibited excellent solubility in a range of nonchlorinated solvents.
Journal ArticleDOI
Multi-mode emission color tuning of dithieno[3,2-b:2′,3′-d]arsoles
TL;DR: In this article, the electronic structures of dithienoarsoles were tuned in multiple ways: structural modification of the π-conjugated system and reactions of the arsenic atom.
Journal ArticleDOI
Versatile use of ZnO interlayer in hybrid solar cells for self-powered near infra-red photo-detecting application
Jun Young Kim,Premkumar Vincent,Jaewon Jang,Min Seok Jang,Muhan Choi,Jin-Hyuk Bae,Changhee Lee,Hyeok Kim +7 more
TL;DR: In this article, the authors investigated the possibility of shifting the absorption peak of the hybrid solar cell into the red to near infra-red (NIR) region using a ZnO optical spacer.
Journal ArticleDOI
Photophysical, electrochemical and flexible organic resistive switching memory device application of a small molecule: 7,7-bis(hydroxyethylpiperazino) dicyanoquinodimethane
Anwarhussaini Sd,Himabindu Battula,Pavan Kumar Reddy Boppidi,Souvik Kundu,Chanchal Chakraborty,Subbalakshmi Jayanty +5 more
TL;DR: In this paper, a flexible Al/BHEPDQ/ITO/PET nonvolatile memory device was fabricated and different electrical performances were tested, which demonstrated excellent switching property.
Journal ArticleDOI
New D-A1–D-A2-Type Regular Terpolymers Containing Benzothiadiazole and Benzotrithiophene Acceptor Units for Photovoltaic Application
Mukhamed L. Keshtov,Alexei R. Khokhlov,Serge A. Kuklin,Fang-Chung Chen,Emmanuel N. Koukaras,Ganesh D. Sharma +5 more
TL;DR: The highest occupied molecular orbital (HOMO) and lowest unoccupied (LUMO) molecular orbital energy levels of these terpolymers indicate that there is sufficient LUMO offset with PCBM for efficient exciton dissociation, and their deeper HOMO levels ensure the high open-circuit voltage for the resultant bulk heterojunction solar cells.
References
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