Two narrow-band gap of donor-acceptor based conjugated polymers, BTTP and BTTP-CN were synthesized by Wittig copolymerization with thiophene or cyano-vinylene thiophene as the donor and 2,1,3-benzothiadiazole as acceptor units. The polymers were investigated by FT-IR, UV-V is, fluorescence spectroscopy, thermal stability and cyclic voltammetry (CV). The thermal analysis revealed that the BTTP polymer was stable up to 220 °C and BTTP-CN was stable up to 254 °C. The absorption spectra showed absorption maxima at 403 nm for BTTP and 397 nm for BTTP-CN. The polymers BTTP exhibited orange colour fluorescence emission at 585 nm and BTTP-CN exhibited yellow color fluorescence emission at 520 nm. The optical band gap values of undoped polymers BTTP and BTTP-CN were calculated as 2.2 and 2.13 eV respectively. Novel synthesized polymers were then enforced as dopant/additive-free hole transport materials in perovskite solar cells. Both polymers has shown the photovoltaic performance of 3.80 % for BTTP and 3.48 % for BTTP-CN under 1 sun illumination. The photovoltaic performance are compared with reference hole transporting material of spiro-OMeTAD with and without additive as 12.53 and 7.55% respectively. © 2018 Elsevier B.V.

Mahesh Ganesapillai

Department of Chemical Engineering

School of Chemical Engineering

Vellore Campus

Karpagam S

Department of Chemistry

School of Advanced Sciences

Putnin T

Le H

Bui T.-T

Ounnunkad K

Goubard F.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

&nbsp;

&nbsp;

VIT University

Journal of Photochemistry and Photobiology A: Chemistry

A new series of donor-acceptor (P1-P3) conjugated polymers containing carbazole and quinoxaline units have been synthesized through multistep reactions. In the final step, the polymerization was carried out using Wittig reaction. The optical and potential charge –transporting properties of the polymers has been carefully investigated by UV-Vis, fluorescence emission spectroscopy and cyclic voltammetry. Solvent effects on absorption and emission spectra of these polymers have also been studied. Compared with optical spectra of the polymers in solution and in solid state, the solid state of the polymers was significantly red shifted. Cyclic voltammetry experiments showed that these polymers have high lying HOMO energy levels ranging from −5.57 to −5.49 eV and low-lying LUMO energy levels ranging from 3.24 to 3.30 eV. The electrochemical band gap was good agreement with the optical band gap. Results of TGA and AFM analysis demonstrated that the compounds exhibited good thermal stabilities and smooth roughness. Furthermore, the molecular interactions of polymers with electron donor (N, N'-dimethylaniline) and electron acceptor (dimethyl terephthalate) were also investigated. In addition, the sensing behaviour was observed with various metal ions such as Li+, Na+, K+, Mg2+, Ca2+, Mn2+, Ni2+, Cd2+, Cu2+, Zn2+, Fe2+ and Hg2+. The synthesized polymers were shown excellent sensing behaviour towards Ni2+ ions. Excellent metal ion sensing and luminescence of our polymer will move towards to the application of chemical and bio sensor field. © 2016 Elsevier Ltd

Dyes and Pigments

Synthesis and photo physical properties of carbazole based quinoxaline conjugated polymer for fluorescent detection of Ni 2+

We report on the synthesis and characterization of low band gap, blue light emitting and thermal stable conjugated oligomer by Wittig condensation. Thiophene and thiazole type of donor-acceptor based series of conjugated oligomers, Oligo-4,5-bis-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OBTV-TZ) and Oligo-2,4,5-Tris–[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OTTV-TZ) were synthesized. These oligomers were confirmed by FT-IR and 1H-NMR and LC/MS analysis. The effect of the number of thiophene rings on the optical, electrochemical, thermal and morphological properties of the oligomers were systematically investigated. Both oligomers were exhibited almost same absorption wavelength in methanol solution (λmax = 365 nm and 369 nm) which indicates both oligomers illustrate similar intra molecular charge transfer (ICT). In solid state, the oligomers were exhibited broadening peaks with higher onset absorptions (λmax = 600 nm and 580 nm). The photoluminescence absorption spectrum of the oligomers was observed at 433 nm and 434 nm respectively in methanol solution with blue emission. The electrochemical band gap (Egec) of the OBTV-TZ was 1.55 eV (low band gap) and OTTV-TZ was exhibited greater highest occupied molecular orbital (HOMO) value (EHOMO = −6.6 eV). Moreover morphological parameters of both oligomer film of 2D and 3D diagrams were observed by using AFM studies. © 2016, Springer Science+Business Media New York.

Journal of Fluorescence

Synthesis and Optoelectronic Properties of Thiophene Donor and Thiazole Acceptor Based Blue Fluorescent Conjugated Oligomers

European Polymer Journal

Poly(3,4-ethylenedioxythiophene/permethylated β-cyclodextrin) polypseudorotaxane and polyrotaxane: Synthesis, characterization and application as hole transporting materials in perovskite solar cells

Nano Energy

Molecular engineering of conjugated polymers for efficient hole transport and defect passivation in perovskite solar cells

RSC Advances

A fluorescent dye with large Stokes shift and high stability: synthesis and application to live cell imaging

Role of cyano substituents on thiophene vinylene benzothiadiazole conjugated polymers and application as hole transporting materials in perovskite solar cells

Journal	Data powered by TypesetJournal of Photochemistry and Photobiology A: Chemistry
Publisher	Data powered by TypesetElsevier BV
ISSN	1010-6030
Open Access	0