Simple Fluorene Based Triarylamine Metal-Free Organic Sensitizers

Multi‐Dentate Carbazole Based Schiff Base Dyes with Chlorovinylene Group in Spacer for Dye‐Sensitized Solar Cells: A Combined Theoretical and Experimental Study.

“…Thus, 3 a and 3 b gave more appreciable results than 3 c and 3 d. This can be attributed to the presence of long hexyl chain which is responsible for high efficiency probable owing to electron donating ability of alkylated carbazole donor than arylated carbazole donor. [69] Effect of donor unit on photovoltaic performance can be seen from this order 3 b > 3 a > 3 d > 3 c. The observed difference might be due to more donating capacity, reduction in dye loading due to larger surface area and better electron transfer. Figure 8 gives the IPCE graph of DSSCs with the highest value of 78% for 3 b which is highest amongst all four dyes.…”

“…[7][8] However, they suffer from the disadvantage of the limited resource, heavy metal toxicity, [9] and environmental issue, [10] high cost, [11] low molar extinction coefficients, [11] and difficulties encountered with purifications. [12] The metal-free organic colorants have benefits of high molar extinction coefficient, [13] environmental friendliness, [14] higher structural flexibility, [15] lower costs, [14] easier preparation and purifications, [16] the possibility of tuning of the absorption, emission, and electrochemical properties. Metal-free dyes consist of D-π-A systems linked via a π-delocalized spacer.…”

Development of Ruthenium Complex Based Sensitizers, Organic Based Sensitizers, and Co-sensitization System for Dye-sensitized Solar Cells

“…Power efficiency of 4.12% was achieved for the 4-aminobenzoic acid unit in the D-D-A-π-A organic sensitizer (dye 54), which efficiently withdraws and injects an electron into the conduction band of TiO2, which leads to efficient charge generation, transport, and injection [56]. Using the rhodanine-3-acetic acid acceptor in the D-π-A organic sensitizer (dye 55) produced a maximum IPCE of 79% at 485 nm [57]. DSSCs incorporating pyridine-based electron acceptors have also been studied recently, including pyridine-N-oxide (dye 56) [58], pyridinium (dye 57) [59], and pyrido [3,4-b]pyrazine (dye 58) [60].…”

“…(Copyright (2013) The Royal Society of Chemistry); dye 54, reproduced with permission from Ref [56]. (Copyright (2015) Elsevier); dye 55, reproduced with permission from Ref [57]. (Copyright (2015) Elsevier); dye 56, reproduced with permission from Ref [58].…”

Panchromatic dyes having diketopyrrolopyrrole and ethylenedioxythiophene applied to dye-sensitized solar cells

“…The synthetic routes of D-A-π-A dyes having both EDOT and DPP units are shown in Scheme 1. The starting compounds, N-(4-bromophenyl)-N,N-diphenylamine (1a) [39], N,N-bis(9,9-dihexyl-9H-fluoren-2-yl)-N-(4-bromophenyl)amine (1b) [40], 2-tributylstannyl-3,4-ethylenedioxythiophene (2) [35], and 3,6-bis(5-bromo-2-thienyl)-2,5-dialkyl-2,5-dihydropyrrolo [3,4-c]pyrrole-1,4-dione ( 5) [41] were synthesized according to previously published procedures. The Stille coupling reaction of bromo-triarylamine (1) and stannyl-EDOT (2) gave the compounds 3.…”