Spacer length dependence of photoinduced electron transfer in heterosupramolecular assemblies of TiO2 nanoparticles and terthiophene

Interfacial electron transfer mechanisms in bithiophene sensitized TiO2 based solar cells

“…The electron injection yield is estimated to be > 99 % by calculation from these quenching data, in accordance with the previous reports . [20,21 ] Following the BTC excitation, the electron injection from the BTC to the Ti0 2 conduction band is expected to occur on femtosecond or picosecond time scales. This speculation can be justified by the report published by Janssen et al [20 ] that the electron transfer from the terthiophene attached Ti0 2 nanoparticle was <4 ps.…”

“…[20,21 ] Following the BTC excitation, the electron injection from the BTC to the Ti0 2 conduction band is expected to occur on femtosecond or picosecond time scales. This speculation can be justified by the report published by Janssen et al [20 ] that the electron transfer from the terthiophene attached Ti0 2 nanoparticle was <4 ps. The e lectron injection from a dye to a semiconductor is reported to occur on femtosecond and picosecond time scales.…”

Application of Poly(3‐hexylthiophene) Functionalized with an Anchoring Group in Dye‐sensitized Solar Cells

“…An electrolyte solution containing 0.1 M LiI, 0.03 M iodine, 1.2 M 1-propyl-2,3-dimethyl imidazolium iodide (DMPII) and 0.5 M 4-tertbutylpyridine (TBP) in propylene carbonate (PC) was used for all the devices. [21] Table 2 shows the performances of DSSCs using polymers 3, 4 and 5 as sensitizers, obtained under irradiation of 100 mW Á cm…”

“…[17][18][19] However, short oligothiophene systems functionalized with a binding group such as carboxylic or phosphonic acid efficiently inject electrons in TiO 2 . [20][21][22][23] Yanagida and co-workers reached higher efficiency with poly(3-thiophene acetic acid) chemisorbed on TiO 2 thanks to its high molar extinction coefficient (>50 000 L Á mol À1 Á cm À1 ) and the presence of anchoring A series of three poly(3-hexylthiophene) functionalized either with a cyanoacetic acid (CA) or a rhodanine-3-acetic acid anchoring groups were synthesized and characterized. ), 0.65(V), 0.67 and 3.02%, respectively.…”

Dye-sensitized solar cells: Atomic scale investigation of interface structure and dynamics

“…Empirical theoretical approaches, which are mainly based on optimized structural features, ground-state molecular dynamics simulations, and/or with empirical kinetic parameters (such as assuming an exponential decay of ET rate as a function of dye length 39 and constant electron-phonon coupling strength 40 ) , have been commonly employed to deal with the critical electron transfer process at the dye/TiO 2 interface. For instance, Persson et al have studied the influence of anchor-cum-spacer groups on electron transfer time by approximating the effective electronic coupling strength with the calculated band width for heterogeneous electron transfer interactions based on ground-state DFT calculations.…”