In the present study, two new organic dyes based on indigo were prepared and used as sensitizers in dye-sensitized solar cells. To this end, indoxyl was utilized as the electron donor and cyanoacrylic acid as the electron acceptor anchoring groups. These dyes together with their corresponding intermediates were purified and characterized by FTIR, 1HNMR, 13CNMR, elemental analysis and UV-Visible...

Indium tin oxide (ITO) is an attractive substrate for single-molecule electronics since it transparent while maintaining electrical conductivity. Although has been used before as a contacting electrode in studies, these studies have limited to the use of carboxylic acid terminal groups binding molecular wires ITO substrates. There thus need investigate other anchoring with potential effectively...

Abstract Starting with Coumarin-6 dye, two novel D-π-A organic dyes C6X and C6N have been designed by attaching carboxylic acid cyanoacrylic groups as anchoring to Coumarn-6 respectively, understand their potential use in dye-sensitized solar cells (DSSCs). The electronic structure photophysical photovoltaic properties of the were studied using density functional theory DFT time-dependent TD-DF...

Perylene monoimides or monoanhydrides are being intensively investigated as sensitizers in DSSCs. Keeping only one acceptor group, i.e. imide or anhydride, and introducing a donor group in the 9-position (such as diarylamine) proved to be important in order to obtain a favorable orbital partitioning strength and dipole moment of perylene compounds for DSSCs [1]. One way to control optical and e...

Two new photosensitizers featured with a cyanoacrylic acid electron acceptor (A) and a hybrid electron donor (D) of cyclopentadithiophene and dithiafulvenyl, either directly linked or separated by a phenyl ring, were synthesized and characterized. Both of them undergo two reversible oxidations and strongly absorb in the visible spectral region due to a photo-induced intramolecular charge-transf...

To understand the importance of the organic material of type donor-π-acceptor dyes (D-π-A), used for dyesensitized solar cells (DSSCs), we present in this paper the result of six compounds based on thienopyrazine (D1-D6) studied by density functional theory (DFT) and time dependent DFT (TD-DFT) approaches to shed light on how the π-conjugation order influence the performance of the dyes. The el...

We have designed and synthesized two new diketopyrrolopyrrole (DPP) based organic sensitizers (DPPCA and DPPCN) with the dithiafulvalene (DTF) unit as donor and cyanoacrylic acid/malononitrile as acceptor moieties. These dyes showed excellent efficiency of photocatalytic hydrogen production over a Pt-TiO2 composite via solar-induced water splitting. The sensitizers showed broad absorptions over...

Four organic donor-π-bridge-acceptor dyes containing phenothiazine as a spacer and cyanoacrylic acid as an acceptor were synthesized and tested as sensitizers in dye-sensitized solar cells (DSCs). The influence of iodide- and cobalt-based redox electrolytes on the photovoltaic device performance was investigated. In these new dyes, systematic π-conjugation was extended by inserting one or two p...

Novel five organic donor-π-acceptor molecules (D-π-A) used for dye sensitized solar cells (DSSCs) and for organic solar cells (OSC), based on thienopyrazine and thiophene were studied by density functional theory (DFT) and timedependent DFT (TD-DFT) approaches to shed light on how the π-conjugation order influence the performance of the solar cells. The electron acceptor (anchoring) group was 2...

We report the synthesis and characterization of five new donor–π–spacer–acceptor dye molecules with a diphenylamine donor, fluorene–1,2,5-oxadiazole spacers and a range of acceptor/anchor groups (carboxylic acid 1, cyanoacrylic acid 2 and 3, alcohol 4 and cyano 5) to facilitate electron injection from the excited dye into the TiO2 photoanode in dye-sensitized solar cells (DSSCs). Detailed photo...