874969-08-1Relevant articles and documents
Synthesis and characterization of new carbazole-based materials for optoelectronic applications
Bahy, Amira,Chemli, Mejed,Hassine, Béchir Ben
, p. 4026 - 4029 (2013)
New triazolo-carbazole derivatives were synthesized by copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. The chemical structures of these compounds were confirmed by NMR and FT-IR spectroscopic analysis. The optical properties of the triazolo-carbazoles were investigated by UV-visible absorption and photoluminescence spectroscopy; an emission in the ultraviolet region was observed. The energy levels of these organic materials were determined by cyclic voltammetry and showed a relatively high electronic affinity indicating that they might be good candidates for electron-injection hole-blocking layers in organic light-emitting diodes.
Improved molecular architecture of D-π-A carbazole dyes: 9% PCE with a cobalt redox shuttle in dye sensitized solar cells
Soni, Saurabh S.,Fadadu, Kishan B.,Vaghasiya, Jayraj V.,Solanki, Bharat G.,Sonigara, Keval K.,Singh, Ashish,Das, Dipjyoti,Iyer, Parameswar K.
, p. 21664 - 21671 (2015/11/10)
Two new D-π-A dyes (SK2 & SK3) based on carbazole, and vinylene-phenylene (π-bridge) with rhodanine-3-acetic acid and cyanoacrylic acid as electron withdrawing-injecting as well as anchoring groups were designed and synthesised under conditions that were free from precious metal-catalysts and well characterized for dye-sensitized solar cell (DSSC) applications. A high power conversion efficiency (PCE) of 9% (AM 1.5 G, 100 mW cm-2) has been achieved using cyanoacrylic acid as an acceptor in D-π-A carbazole dye (SK3) with a cobalt based redox shuttle, while a PCE of 7.1% was exhibited in triiodide based redox mediators. A short-circuit current density, Jsc of ～18.2 mA cm-2, an open-circuit voltage, Voc of ～725 mV, and a fill factor, FF of ～67% have been afforded by the SK3 based DSSC incorporating the Co2+/Co3+ electrolyte as the one-electron redox mediator. In contrast, SK2 dye based DSSCs with a cobalt based redox mediator have shown a Jsc ≈ 8.4 mA cm-2, a Voc ≈ 587 mV, and a FF ≈ 48%, yielding a PCE of 2.4%. The devices based on SK3 showed outstanding stability performance without significant degradation even after 1000 h of illumination under standard conditions in the Co2+/Co3+ electrolyte.
