Frontiers of Optoelectronics, Volume. 4, Issue 1, 72(2011)
Electron transportation and optical properties of microstructure TiO2 films: applied in dye-sensitized solar cells
Micro-structure of TiO2 films in dye-sensitized solar cells (DSSCs) can affect light absorption and electron transportation that impact on the characteristics of currentvoltage (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 (η) 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 intensitymodulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) implied that the electron transport time (τd) 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 (Jlim) of I -3 in TiO2 film increased with its porosity, which revealed that the transportation of redox mediators in the electrolyte was speeded up.
Get Citation
Copy Citation Text
Shuangying XU, Linhua HU, Jiang SHENG, Dongxing KOU, Huajun TIAN, Songyuan DAI. Electron transportation and optical properties of microstructure TiO2 films: applied in dye-sensitized solar cells[J]. Frontiers of Optoelectronics, 2011, 4(1): 72
Received: Oct. 18, 2010
Accepted: Dec. 30, 2010
Published Online: Sep. 21, 2012
The Author Email: DAI Songyuan (sydai@ipp.ac.cn)