期刊
FRONTIERS OF OPTOELECTRONICS
卷 4, 期 1, 页码 72-79出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s12200-011-0202-5
关键词
micro-structure; porosity; optical property; electron transport; dye-sensitized solar cell (DSSC)
资金
- National Basic Research Program of China [2011CBA00700]
- National High Technology Research and Development Program of China [2009AA050603]
- Chinese Academy of Sciences for Key Topics in Innovation Engineering [KGCX2-YW-326]
- National Natural Science Foundation of China [20703046]
Micro-structure of TiO2 films in dye-sensitized solar cells (DSSCs) can affect light absorption and electron transportation that impact on the characteristics of current-voltage (J-V). In this paper, films with different surface area, pore size and porosity were obtained by adding different ratio of ethyl cellulose (Ec-S) to pastes, and a photo-electric conversion efficiency (eta) of 7.55% with a short-circuit current density (Jsc) of 16.81 mA . cm(-2) was obtained when the ratio of Ec-S was 10:5. BET results showed that film with this optimum ratio had the most suitable pore size and surface area for good properties of photovoltaic, which had a low reflectivity and high transmission rate, and the efficiency of light utilization was improved. Moreover, measurements by intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) implied that the electron transport time (tau(d)) increased as the content of Ec-S increased, which was related to the larger surface area. Results of steady-state cyclic voltammetry indicated that diffusion-limited current density (J(lim)) of I-3(-) in TiO2 film increased with its porosity, which revealed that the transportation of redox mediators in the electrolyte was speeded up.
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