| Improvement electrical resistivity of PEDOT:PSS containing TiO2 nanoparticles films on glass substrates by post treatment for using solar cell |
| Paper ID : 1420-UFGNSM-FULL |
| Authors: |
|
ameneh mazarji nejad *1, Sohrab Manouchehri2, fahimeh zahedy3, mohammad hassan yousefi4 14971886441 2Department of applied physics, Maleke-Ashtar University of Technology, Shahinshahr, 83157-13115, Iran. 31Department of applied physics, Maleke-Ashtar University of Technology, Shahinshahr, 83157-13115, Iran 4Department of applied physics, Maleke-Ashtar University of Technology, Shahinshahr, 83157-13115, Iran |
| Abstract: |
| Semiconductors are used in solar cells because they deliver higher energy conversion efficiency. Semiconductor TiO2 nanoparticles have the highest energy conversion efficiency in solar cells among available semiconductors (ZnO, WO3, In2O3, SnO2). Many researchers observed that the pure PEDOT:PSS (Poly (3,4-Ethylendioxythiophene)–Poly StyreneSulfonate) counter electrodes generate lower cell efficiency than Pt-based DSSC. Nanoparticles have a high surface area to volume aspect ratio. Thus, in order to enhance polymer based DSSC performance, TiO2 nanoparticles are incorporate with polymer to increase the film surface area, conductivity and/or catalytic activity. However, the thickness of the film is important in film resistivity and can be effective on solar cell efficiency. In this work the effect of deposition method, film thickness and polymer concentration were studied in improving electrical resistivity of PEDOT:PSS. PEDOT:PSS and PEDOT:PSS containing TiO2 nanoparticles films were deposited on glass substrates using drop-casting under heating, spin-coating and Plasma deposition methods with different film thickness and polymer concentration. The sheet resistance of the films was measured by 2 point probe method. In addition, UV-visible and Photoluminescence (PL) spectra were studied for optical properties. The resistivity results showed the films resistivity that produced by Plasma deposition method were the order of 20 MΩ or more. Therefore, this method is not convenient for our purpose. Produced films by spin-coating and drop-casting under heating methods with the same concentration of TiO2 NPs showed almost the same resistivity about 1300 kΩ. The films were improved using proximity with methanol vapor and N2 gas. Then, the films resistivity reduced to 120 kΩ. The results also showed the films resistivity reduced by increasing films thicknesses. The films resistivity did not have considerable changes by increasing the concentration of TiO2 NPs. UV-visible and spectra results showed the improved films were convenient for solar cell applications. |
| Keywords: |
| solar cell, TiO2 nanoparticles, resistivity, PEDOT:PSS film, deposition |
| Status : Paper Accepted (Poster Presentation) |
