Electronic and optical properties of the triphenylamine-based organic dye sensitized TiO2 semiconductor: insight from first principles calculations

Literature Information

Publication Date 2013-05-02
DOI 10.1039/C3CP51019K
Impact Factor 3.676
Authors

Jinxia Liang, Zexing Cao


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Abstract

Plausible mechanisms of the ultrafast electron injection and the significant dependence of the power conversion efficiency on the anchor group for the triphenylamine-based dye-sensitized TiO2 solar cells have been explored by the density functional calculations. Calculations show that the ultrafast charge recombination on the surface trap state of the dye-sensitized TiO2 system can be ascribed to the lack of electron density on the carboxyl group of the A3 dye with the rhodanine group anchor. Predicted electronic and optical properties of the A1-3-adsorbed TiO2 system reveal that the direct electron injection arises from the electronic excitation from HOMO-1 of the dye to the conduction band bottom of TiO2. On the basis of the calculations, the electron density distributions of related frontier orbitals and energy bands of dyes and their adsorbed systems have been discussed, which play an important role in electron injection and charge recombination.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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