Role of Hot Singlet Excited States in Charge Generation at the Black Dye/TiO2 Interface

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• 作者：Ajay Ram Srimath Kandada ; Simona Fantacci ; Simone Guarnera ; Dario Polli ; Guglielmo Lanzani ; Filippo De Angelis ; Annamaria Petrozza
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：May 22, 2013
• 年：2013
• 卷：5
• 期：10
• 页码：4334-4339
• 全文大小：330K
• 年卷期：v.5,no.10(May 22, 2013)
• ISSN：1944-8252

文摘

Photoinduced electron transfer at low-band-gap ruthenium-based dye/TiO₂ has been investigated by means of ultrafast transient absorption and DFT/TDDFT calculations. We demonstrate that although the charge generation mechanism is triplet mediated upon band gap excitation, as already proven in high band gap dyes such as the well-known N3 and N719, when excess energy is provided which allows to reach high energy singlet states still in the visible spectral range, ultrafast electron transfer takes place. No intersystem crossing process is observed and charge generation happens only from the singlet excited state.

Keywords:

black dye; DSSC; charge generation; hot injection; DFT; transient absorption