1372129-89-9

Upstream product

• 2255-78-9 4-bromo-7-(bromomethyl)benzo[c][1,2,5]thiadiazole 
• 1071224-34-4 7-bromobenzo[c][1,2,5]thiadiazole-4-carboxaldehyde 
• 1372129-88-8 5-(N,N-bis(4-hexyloxyphenyl)-4-aminophenyl)-5'-(tri-n-butylstannyl)-2,2'-bithiophene 
• 1256844-72-0 5-(5-(4-(N,N-bis(4-hexyloxyphenyl)amino)phenyl)thiophene-2-yl)thiophene 
• 133144-35-1 [2,2′-bithiophen]-5-yltrimethylstannane 
• 1092363-75-1 N,N-bis(4-hexyloxyphenyl)-4-bromophenylamine 
• 1421265-53-3 C₄₁H₅₁NO₂S₂Sn 

Downstream Products

• 1421265-61-3 C₄₈H₄₆N₄O₄S₃ 

Relevant academic research and scientific papers

New panchromatic dyes comprising benzothiadiazole units within a donor-acceptor π-conjugated spacer. Synthesis and photophysical properties

Four new organic dyes (D1-D4) having donor-(π-conjugated spacer(donor-acceptor))-acceptor (D-π(D-A)-A) type conjugated systems were synthesized. The dyes were studied for their photophysical and electrochemical properties. The dyes comprised electron donor bis(4-hexyloxy)triphenylamine (D), and electron acceptor cyanoacrylic acid (A) ends connected through a donor-acceptor conjugated spacer group. The conjugated spacer was designed as donor-acceptor system having thiophene to terthiophene and selenophene as donors and benzothiadiazole as acceptor. Thus, optical absorption strengths of the dyes successfully tuned by using the electron accepting property of benzothiadiazole and varying numbers of thiophenes and selenophene. Panchromatic absorption with high extinction coefficient was observed for all four dyes D1-D4.

Significant improvement of dye-sensitized solar cell performance by small structural modification in π-conjugated donor-acceptor dyes

Two donor-π-acceptor (D-π-A) dyes are synthesized for application in dye-sensitized solar cells (DSSC). These D-π-A sensitizers use triphenylamine as donor, oligothiophene as both donor and π-bridge, and benzothiadiazole (BTDA)/cyanoacrylic acid as acceptor that can be anchored to the TiO2 surface. Tuning of the optical and electrochemical properties is observed by the insertion of a phenyl ring between the BTDA and cyanoacrylic acid acceptor units. Density functional theory (DFT) calculations of these sensitizers provide further insight into the molecular geometry and the impact of the additional phenyl group on the photophysical and photovoltaic performance. These dyes are investigated as sensitizers in liquid-electrolyte-based dye-sensitized solar cells. The insertion of an additional phenyl ring shows significant influence on the solar cells' performance leading to an over 6.5 times higher efficiency (η = 8.21%) in DSSCs compared to the sensitizer without phenyl unit (η = 1.24%). Photophysical investigations reveal that the insertion of the phenyl ring blocks the back electron transfer of the charge separated state, thus slowing down recombination processes by over 5 times, while maintaining efficient electron injection from the excited dye into the TiO 2-photoanode. Copyright