Citation: YANG Lin, LI Yang, CHEN Shu, ZHANG Jing, ZHANG Min, WANG Peng. Ultrafast Spectroscopic Studies of Excited State Relaxation and Electron Injection in Organic Dye-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2016, 32(1): 329-336. doi: 10.3866/PKU.WHXB201511031 shu

Ultrafast Spectroscopic Studies of Excited State Relaxation and Electron Injection in Organic Dye-Sensitized Solar Cells

YANG Lin ^1,2 ,
LI Yang ^1,2 ,
CHEN Shu ^1,2 ,
ZHANG Jing ¹ ,
ZHANG Min ^1,, ,
WANG Peng ¹

1.
1 State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
2.
2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Corresponding author: ZHANG Min,
Received Date: 2 October 2015
Available Online: 2 November 2015
Fund Project: 国家自然科学基金(51473158,91233206,51125015)资助项目 (51473158,91233206,51125015)

Unlocking the dynamics of the evolution of the excited state at the complicated titania/dye/ electrolyte interface in organic dye-sensitized solar cells is crucial to provide a basis for the rational design of low-energy-gap organic photosensitizers. By constructing two organic donor-acceptor dyes composed of benzothiadiazole-benzoic acid (BTBA) and pyridothiadiazole-benzoic acid (PTBA) as electron acceptors, we have identified the images of multiple-step relaxations of the excited state and multiple-state electron injections at the titania/dye/electrolyte interface using ultrafast transient absorption spectroscopic measurements in conjunction with theoretical simulations. Density functional theory and time-dependent density functional theory calculations indicate that there should be torsion-induced excited state relaxations from an optically generated “hot” excited state to the equilibrium excited state characteristic of a more planar conjugated backbone and a quinonoid structure for dye molecules on the titania surface, suggesting the probable presence of multiple-state electron injections at the titania/dye/electrolyte interface. In virtue of a target analysis of femtosecond transient absorption spectra, we have found that the dye with PTBA features a much lower overall electron injection yield with respect to the dye with BTBA owing to the sluggish electron injection and short lifetime of the excited state, accounting for a lower maximum of external quantum efficiencies of the device made from the dye with PTBA as an acceptor.
- Solar cell,
- Organic dye,
- Interface,
- Excited state,
- Charge transfer
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