- Asymmetric push-pull small molecules with auxiliary electron-accepting unit for bulk heterojunction organic solar cells
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Two small molecular donors (TPA-DPP and TPA-DPP-MDN) were designed with asymmetric push-pull structure, namely, donor-acceptor (D-A) and donor-acceptor-acceptor (D-A-A) systems. They were synthesized and investigated by thermogravimetric analysis, UV–vis spectra, X-ray diffraction, density functional theory (DFT) calculation, electrochemical and the photovoltaic (PV) measurement. The D-A-A architecture (TPA-DPP-MDN) exhibited lower highest occupied molecular orbital (HOMO) of –5.18 eV, narrower optical band gap of 1.52 eV, better thermal stability and higher degree of ordered aggregation than these of the D-A system (TPA-DPP). TPA-DPP-MDN based PV device showed better performance with higher open-circuit voltage (VOC) and short-circuit current density (JSC) than these of TPA-DPP based PV devices due to the low-lying HOMO level and wide spectral absorption range of TPA-DPP-MDN.
- Chen, Ying,Yang, Duo,Liu, Wei,Tong, Junfeng,Yang, Chunyan,Zhang, Peng
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- Synthesis and photovoltaic performances of conjugated copolymers with 4,7-dithien-5-yl-2,1,3-benzothiadiazole and di(p-tolyl)phenylamine side groups
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Three new copolymers (PT-TPA, PT-DTBT and PT-DTBTTPA) based on benzo[1,2-b:4,5-b]dithiophene (BDT) and thiophene with different conjugated side chains (di(p-tolyl)phenylamine (TPA), 4,7-dithien-5-yl-2,1,3-benzothiadiazole (DTBT) and DTBT-TPA) were synthes
- Li, Haohao,Luo, Hao,Cao, Zhencai,Gu, Zhaojie,Shen, Ping,Zhao, Bin,Chen, Huajie,Yu, Gui,Tan, Songting
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- Additional donor bridge as a design approach for multi-anchoring dyes for highly efficient dye-sensitized solar cells
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This work presents an approach for designing efficient multi-anchoring dyes for dye-sensitized solar cells by using additional donor as a bridging group between donor–acceptor (D–A) side arms. With triarylamine as the additional donor and phenothiazine-cyanoacrylic acid as the D–A side arm, the multi-anchoring dyes exhibited higher molar extinction coefficients in the intramolecular charge transfer bands, less dye aggregation on the TiO2 surface, and better DSSC performance than that of the mono-anchoring reference dye. The best cell efficiency of 7.06% was obtained from the di-anchoring dye with two additional donor units T2P2 showing the largest charge recombination resistance of 99.7 Ω, open circuit voltage of 0.83 V, and short-circuit photocurrent density of 12.72 mA cm?2. The improvement in performance of the designed dyes suggests that additional donor is a potential bridging group for efficient multi-anchoring sensitizers.
- Eiamprasert, Utt,Sudchanham, Jutarat,Surawatanawong, Panida,Pakawatpanurut, Pasit,Kiatisevi, Supavadee
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- Substituted triphenylamines as building blocks for star shaped organic electronic materials
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A versatile synthetic protocol toward a series of various substituted triphenylamine derivatives serving as building blocks for organic electronic materials was developed. Key steps during synthesis were either Ullmann condensations or nucleophilic aromatic substitutions giving rise to structural modification of triphenylamines and their electronic nature. In turn, these scaffolds were exemplarily attached to a dendritic tris(2-thienyl)benzene core affording star shaped organic semiconducting materials which were characterized regarding their photo-physical, electro-chemical and thermal properties. A strong influence of the substituent's nature on both photo-physical and morphological thin film characteristic of star shaped target compounds was observed. The applicability of these materials in organic electronic devices was demonstrated in an organic field effect transistor configuration yielding a hole mobility of nearly 10-3 cm2 V-1 s-1. The performance of the materials can be correlated to the substituents applied. This journal is
- Lumpi, Daniel,Holzer, Brigitte,Bintinger, Johannes,Horkel, Ernst,Waid, Simon,Wanzenb?ck, Heinz D.,Marchetti-Deschmann, Martina,Hametner, Christian,Bertagnolli, Emmerich,Kymissis, Ioannis,Fr?hlich, Johannes
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p. 1840 - 1851
(2015/03/18)
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- Synthesis of some green dopants for OLEDs based on arylamine 2,3-disubstituted bithiophene derivatives
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A series of green dopants based on 2,2-diphenylvinyl end-capped bithiophene and three different arylamine moieties (9-phenylcarbazole, triphenylamine, and N,N'-di-(ptolyl) benzeneamine) were successfully synthesized by the Suzuki and Wittig coupling react
- Song, Mi-Seon,Nguyen, Quynh Pham Bao,Song, Chang-Hyun,Lee, Duckhee,Chai, Kyu Yun
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p. 14033 - 14041
(2014/01/06)
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- Solution phase studies towards the synthesis of triarylamine oligomers using a germanium linker on a solid support
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In this letter, we describe the iterative solution phase synthesis of a triarylamine trimer as proof of concept towards the synthesis of oligomeric materials by solid-phase synthesis. Our model system utilises the stability of germanium linkers to nucleophilic conditions to develop efficient steps towards oligomer synthesis via (i) selective deprotection of tert-butyl-dimethyl-silyl ether (OTBDMS) functionality, (ii) conversion to reactive trifluoromethanesulfonate (triflate) functionality and (iii) Suzuki cross-coupling reactions.
- Anémian,Cupertino,Mackie,Yeates
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p. 6717 - 6721
(2007/10/03)
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