Synthesis and photovoltaic properties of two-dimensional conjugated polythiophene derivatives presenting conjugated triphenylamine/thiophene moieties

EnantioselectiveEthylation of Various Aldehydes Catalyzed by Readily Accessible Chiral Diols

“…The C 2 ‐symmetric chiral diols were prepared in good overall yields according to the synthetic routes outlined in Scheme . The key compounds dibromo‐substituted ( E )‐stilbene 3 and 4 were not commercially available and needed to be synthesized. Dibromo‐substituted ( E )‐stilbene 3 and 4 were synthesized via different methods such as McMurry coupling or Wittig reaction by different research groups.…”

“…All reagents were purchased and used without purification, unless otherwise noted. Compounds (3‐bromobenzyl)phosphonic acid diethyl ester 1 , (4‐bromobenzyl)phosphonic acid diethyl ester 2 , ( E )‐1,2‐bis(4‐bromophenyl)ethane 4 , and (1 R ,2 R )‐1,2‐bis(4‐bromophenyl)‐ethane‐1,2‐diol 6 were synthesized according to previously described procedures . Analytical thin‐layer chromatography (TLC) was performed using Macherey‐Nagel SIL G‐25 UV254 plates.…”

Peripheral group effects on the photophysical and photovoltaic properties of bulk-heterojunction type solar cells based on star-shaped conjugate molecules with triphenylamine core

“…For our TPA-TT/PC 61 BMebased OPVs (OPV I-1 e OPV I-3), the value of V OC increased upon increasing the content of PC 61 BM. Although the value of V OC is determined primarily by the difference in energy level between the LUMO of the electron acceptor (in this case, PC 61 BM) and the HOMO of the electron donor (the conjugated SSM), it is also affected by the PC 61 BM content in the photoactive layer [42,43]. As revealed in Fig.…”

“…To avoid recombination of excitons, the P/N heterojunction phase must be controlled at the nanoscale level [42,43]. We used AFM to investigate the compatibility and morphology of our conjugated SSM/PC 61 BM composite films [33,44].…”

“…Thus, for the TPA-TTebased OPVs, the optimal composition of TPA-TT and PC 61 BM was approximately 1:3 (w/w). Higher concentrations of PC 61 BM favored the formation of phaseseparated interpenetrating networks with sizable domains in the photoactive layer, in turn leading to effective charge separation and charge transfer [42,43]. Efficient dissociation of excitons and higher degrees of charge collection to the electrode generally enhance the J SC and PCE values of OPVs.…”