Triphenylamine-based dyes for dye-sensitized solar cells

Conjugate spacer effect on molecular structures and absorption spectra of triphenylamine dyes for sensitized solar cells: Density functional theory calculations

“…The UV-vis absorption spectra of TPA1-TPA3 were measured in THF solution, and consist of a very intense transition at 432, 473 and 480 nm and of two less intense bands in the 250-400 nm region, respectively [34,35]. As both the HOMO and the LUMO are of the and * type, the HOMO-LUMO transition can be classified as a -* intramolecular charge transfer.…”

“…Aggregation can give rise to self-quenching, instability of the sensitizer, and reduce the electron injection efficiency, resulting in low conversion efficiency of the DSSCs. Recently, triphenylamine-based dyes containing thiophene as the spacers (TPA1-TPA3) were designed and synthesized, with power conversion efficiencies up to 6.15% under AM 1.5 irradiation [34,35]. To theoretically understand the -spacer effect of various unit of thiophene and sensitized mechanism at a molecular level, the geometrical and electronic structures of the triphenylamine dyes TPA1-TPA3 were studied in detail using DFT, and the electronic absorption spectra were investigated based on the TD-DFT calculations.…”

Theoretical investigation of novel carbazole‐fluorene based D‐π‐A conjugated organic dyes as dye‐sensitizer in dye‐sensitized solar cells (DSCs)

“…7 However, ruthenium is very expensive and not readily available due to the low natural abundance. Therefore DSCs based on metal-free dye is subject of many recent research for its potential use as photosensitizer [8][9][10][11][12][13] due to: (i) its lower cost of production compared to Ru complexes, [14][15][16] (ii) its large absorption coefficients from intramolecular p-p* transitions 16 However, there are still challenges [17][18][19][20][21] in achieving needed efficiency in DSCs.…”

Triphenylamine- and benzothiadiazole-based dyes with multiple acceptors for application in dye-sensitized solar cells

“…Recently, Chen and co-workers have reported a serial of TPA based organic dyes, showing that extending the -conjugation of the donor part could improve the photovoltaic performance of the DSSCs [15][16][17]. Very recently, certain other groups [18][19][20][21][22][23][24][25] have reported DSSCs with various triphenylamine based dyes, indicating the importance of their further investigation in this topic.…”