Hits:

Indexed by:Journal Papers

Date of Publication:2015-11-01

Journal:ADVANCED SCIENCE

Included Journals:SCIE、PubMed、Scopus

Volume:2

Issue:11

Key Words:cobalt electrolytes,dye‐sensitized solar cells,hole transport,interfacial charge transfer,recombination dynamics

Abstract:Investigation of charge transfer dynamics in dye-sensitized solar cells is of fundamental interest and the control of these dynamics is a key factor for developing more efficient solar cell devices. One possibility for attenuating losses through recombination between injected electrons and oxidized dye molecules is to move the positive charge further away from the metal oxide surface. For this purpose, a metal-free dye named E6 is developed, in which the chromophore core is tethered to two external triphenylamine (TPA) units. After photoinduced electron injection into TiO2, the remaining hole is rapidly transferred to a peripheral TPA unit. Electron-hole recombination is slowed down by 30% compared to a reference dye without peripheral TPA units. Furthermore, it is found that the added TPA moieties improve the electron blocking effect of the dye, retarding recombination of electrons from TiO2 to the cobalt-based electrolyte.