262291-69-0Relevant articles and documents
Synthesis and characterization of organic dyes bearing new electron-withdrawing group for dye-sensitized solar cells
Salimi Beni,Zarandi,Madram,Bayat,Najafi Chermahini,Ghahary
, p. 504 - 511 (2015)
Three new carbazole-based dyes (DB-CH, DTB-CH, DT-CH) have been synthesized. The dye structures were built from an aliphatic hexyl which served as an electron donor and barbituric acid, thiobarbituric acid and thiazolidine-2,4-dione moieties which served as acceptors. The photophysical and electrochemical properties of the dyes were investigated by UV spectroscopy and cyclic voltammetry (CV). The barbituric acid, thiobarbituric acid and thiazolidine-2,4-dione derivatives were found to affect both the molar extinction coefficients and λmax which was likely due to the extension of the π-conjugation structures of the dyes. In the best case, conversion efficiencies up to 2.16% under full sunlight irradiation were obtained for the DSSCs which incorporated these new dyes. Our study indicated that the inclusion of thiazolidine-2,4-dione as an electron acceptor in the dye structure can lead to an improvement in its photovoltaic performance.
A new carbazole-based helically chiral architecture: Synthesis and physical properties
Ben Braiek, Mourad,Aloui, Faouzi,Ben Hassine, Béchir
, p. 2763 - 2766 (2016)
A short and efficient synthesis leading to a new helically chiral heptacyclic system, containing a carbazole unit, was achieved via a Knoevenagel condensation-photocyclization strategy. The optical properties of the carbazole-based material were investigated by UV-vis absorption and photoluminescence spectroscopy and an emission in the visible region was observed. From the cyclic voltammetry analysis, the electrochemical band gap of the target organic material was estimated to be 2.38 eV indicating that it might be a good candidate for electron-injection hole-blocking layers in organic light-emitting diodes.
Effect of different acceptors on N-hexyl carbazole moiety for dye-sensitized solar cells: design, characterization, molecular structure, and DSSC fabrications
Abusaif, Moustafa S.,Abu-Saied,Fathy,El-Sherif, Ahmed A.,Kashyout,Selim, Mohamed R.,Ammar, Yousry A.
, p. 949 - 960 (2020/10/19)
Hexyl carbazole derivatives are one of the most prominent dye scaffolds in the dye-sensitized solar cells (DSSCs). New substituted carbazole dyes such as DRA-HC, DCA-HC, and DTC-HC were synthesized for DSSCs. These dyes are containing hexyl moiety as electron donor and rhodanine-3-acetic acid, cyanoacetic acid and tetracyanoethylene as an electron acceptor linked to carbazole moiety. The relation between dye structures, photophysical/electrochemical, molecular structure and DSSC manufacturing had been discussed. All structures showed more positive ground-state oxidation potential than I?/I?3 and more negative excited state oxidation potential than the conduction band edge of the semiconductor. The highest efficiency of the DSSCs was obtained in the case of DCA-HC dye (η = 1.41%, VOC = 708?mV, FF = 0.81, and JSC = 2.45?mA?cm?2 with 100?mW?cm?2) compared to other synthesized dyes.
Synthesis of carbazole-based copolymers containing carbazole-thiazolo[5,4-: D] thiazole groups with different dopants and their fluorescence and electrical conductivity applications
Sathiyan, Govindasamy,Thangamuthu, Rangasamy,Sakthivel, Pachagounder
, p. 69196 - 69205 (2016/08/05)
To improve the electrical conductivity of poly(carbazole-thiazolo[5,4-d]thiazole) (p-CzTT), five different dopants, such as HCl, Fe(iii), Cu(ii), H3BO3, and I2, were introduced into its framework through protonation of a nitrogen atom or by complex formation. Carbazole-thiazolo[5,4-d]thiazole (CzTT) and poly(carbazole-thiazolo[5,4-d]thiazole) (p-CzTT) were synthesized by the reactions of carbazole aldehydes and dithiooxamide. The synthesized monomer and polymer were confirmed by FT-IR, UV-vis, 1H, 13C-NMR, and GPC studies. The doped polymers were examined by FT-IR spectroscopy, UV-visible absorption, fluorescence, thermogravimetric analysis (TGA), cyclic voltammetry (CV), and electrical conductivity. The optical band gap (Eoptg) of CzTT and p-CzTT were found to be 2.74 eV and 1.95 eV, respectively. The thermal stability of the polymer showed 5% weight loss at 358 °C. Based on CV analysis, the HOMO and LUMO energy levels and the electrochemical band gap (Ecvg) of p-CzTT were obtained as -5.86 eV, -3.19 eV, and 2.67 eV, respectively. The CzTT and p-CzTT exhibited fluorescence emission at 461 nm and 448 nm, respectively. Among the dopants introduced, Fe(iii)- and I2-doped polymer showed excellent electrical conductivities of 6.8 × 10-5 S cm-1 and 5.9 × 10-5 S cm-1, respectively.
