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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 213 C87 - A Facile Low temperature synthesis of TiO2 nanorods for high efficiency dye sensitized solar cells M.M. Rashad a , A.E. Shalan a , Youhai Yu b , Monica Cantu b , M.S.A. Abdel-Mottaleb c a, Central Metallurgical Research and Development Institute (CMRDI) , P. O. Box : 87 Helwan - Egypt , Cairo, 431, EG b, Centre de Investigacio en Nanociencia I Nanotecnologia (Cin2, CSIC), ETSE, Campus UAB, Edifici Q, 2nd Floor, Bellaterra (Barcelona), E-08193, Spain, E-08193, Spain, Spain c, Nano-Photochemistry and Solar chemistry Lab, Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt, 11566 Abbassia, Cairo, Egypt, Cairo, Egypt A facile low temperature synthesis of TiO2 nanorods for high efficiency dye sensitized solar cells A. E. Shalan1,2, M. M. Rashad 1* , Youhai Yu2, Mónica Lira-Cantú2, and M. S.A. Abdel- Mottaleb3 1Central Metallurgical Research & Development Institute (CMRDI), Electronic and Magnetic Materials Division, Advanced Materials Department, P.O.Box 87 Helwan, Cairo, Egypt 2 Centre de Investigacio en Nanociencia I Nanotecnologia (Cin2, CSIC), ETSE, Campus UAB, Edifici Q, 2ndFloor, Bellaterra (Barcelona), E-08193, Spain 3 Nano-Photochemistry and Solar chemistry Lab, Department of Chemistry, Faculty of Science, Ain Shams University, 11566 Abbassia, Cairo, Egypt *Tel: 202-25010640-43, Fax: 202-25010639 *E-mail: rashad133@yahoo.com Abstract A low-temperature hydrothermal process is developed to synthesize titania nanorods with controlled size for dye-sensitized solar cells (DSSCs). The TiO2 nanorods are characterized using XRD, SEM, TEM/HRTEM, UV-vis Spectroscopy, FTIR and BET specific surface area (SBET) as well as pore-size distribution by BJH. The results indicate that the bulk traps and the surface states within the TiO2 nanorods films enhance the efficiency of DSSCs. The size of the formed titania nanorods was 6.7 nm width and 22 nm length, the specific surface area SBET was 77.14 m2g-1. However, the band gap energy of the obtained titania nanorods was 3.2 eV. A nearly quantitative absorbed photon-to-electrical current conversion achieved upon excitation at wave length of 550 nm and the power efficiency is enhanced from 5.6% for commercial TiO2 nanoparticles Degussa (P25) cells to 7.2% for TiO2 nanorods cells under AM1.5 illumination (100 mWcm-2). The TiO2 cells performance is enhanced due to their high surface area and hierarchically mesoporous structures compared with the "Degussa (P25)". © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 214 C88 – Characterization of Au/n-InP Photovoltaic Structure with Organic Thin Film Omer Gullu a , Enise Ozerden a , Serif Ruzgar a , Sezai Asubay b , Osman Pakma a , Tahsin Kilicoglu a , Abdulmecit Turut c a, Batman University, Batman University, Science and Art Faculty, Physics Dept., Batman, 72060, TR b, Dicle University, Dicle University, Science Faculty, Physics Department, 21000, Diyarbakir, TR c, Ataturk University, Ataturk University, Science Faculty, Physics Department, 25240, Erzurum, TR During the last 20 years organic semiconductors have attracted considerable attention due to their interesting physical properties followed by various technological applications in the area of electronics and optoelectronics. One of the main advantages is the fact that they can be produced in large quantities by simple techniques [1] . Besides, ithas been carried out the fabrications and electrical/optical characterizations of photovoltaics using organic semiconductors. Organic semiconductors show many unusual electrical, optical and magnetic properties, which could be used for the fabrication of molecular electronic devices [2] .These materials also offer low cost and processing ease and can attain new roles not realized by conventional solar cells [3-6] .Among the organic materials, Rhodamine-101 (Rh-101) is considered to be a good candidate for organic semiconductor device fabrication such as Schottky device and solar cell, because it offers a possibility of low-cost and large-area devices. The Rh-101 is a xanthene-type molecule and has a fluorescence quantum yield in ethanol close to unity, being independent of temperature. It appears as green solid [7,8] . Rh-101 organic material has been considered as one of the most stable organic semiconductors for various electronic and optoelectronic applications and has not been used for the modification of n-InP diodes. In this study, we present that Rh-101 organic molecules can control the electrical characteristics of conventional Au/n-InP metal–semiconductor contacts. An Au/n-InP Schottky junction with Rh-101 interlayer has been formed by using a simple cast process. A potential barrier height as high as 0.88 eV has been achieved for Au/Rh-101/n-InP Schottky diodes, which have good current–voltage (I–V) characteristics. This good performance was attributed to the effect of formation of interfacial organic thin layer between Au and n-InP. By using capacitance-voltage (C-V) measurement of the Au/Rh-101/n-InP Schottky diode the diffusion potential and the barrier height have been calculated as 0.78 V and 0.88 eV, respectively. By using the I–V measurement of the diode under illumination, short circuit current and open circuit voltage have been extracted as 1.70 μA and 240 mV, respectively. References [1] Stallinga, P., Gomes, H.L., Murgia, M., Müllen, K., 2002. Interface state mapping in a Schottky barrier of the organic semiconductor terrylene. Organic Electronics 3, 43–51. [2] R.K. Gupta, R.A. Singh, J. Polym. Res. 11 (2004) 269. [3] P. Lizon, Dye sensitized organic semiconductor photovoltaics with resonance energy transfer, Master Thesis, University of Toronto, Toronto, 2004. [4] F. Yakuphanoglu, Sol. Energy Mater. Sol. Cells 91 (13) (2007) 1182. [5] M.M. El-Nahass, K.F. Abd-El-Rahman, A.A.M. Farag, A.A.A. Darwish, Org. Electron. 6 (2005) 129. [6] M.M. El-Nahass, H.M. Zeyada, K.F. Abd-El-Rahman, A.A.A. Darwish, Sol. Energy Mater. Sol. Cells 91 (2007) 1120. [7] T. Karstens and K. Kobs, J. Phys. Chem. 84 (1980) 1871. [8] M. Cakar, N. Yildirim, S. Karatas, C. Temirci, A. Turut, J. Appl Phys. 100 (2006) 074505. © SEFIN 2012
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