کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9605707 | 44092 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of n-p junction electrodes in minimizing the charge recombination and enhancement of photocurrent and photovoltage in dye sensitized solar cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
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چکیده انگلیسی
The composite electrode comprising n-type TiO2 and p-type NiO oxides when sensitized with Ru-dye showed short-circuit photocurrent (Isc) of 17Â mA/cm2 and open-circuit photovoltage (Voc) of 730Â mV compared to Isc of 12Â mA/cm2 and 700Â mV for TiO2 electrodes. Formation of a n-p junction between TiO2 and NiO oxide layers contributes to the enhanced photocurrent, photovoltage, fill factor and efficiency. In addition to the junction effect, NiO acts as a barrier for charge recombination leading to higher cell performance. The efficiency of the NiO coated TiO2 solar cell is 30% more than that of bare TiO2. The negative shift of the flat-band potential of the NiO coated TiO2 electrode compared to TiO2 also could be one of the reasons for higher photovoltage observed for TiO2/NiO electrode. The highest cell efficiencies were obtained immersing TiO2 thin films in Ni2+ solution and converting them to NiO by firing and the optimum NiO coating thickness was found to be only a few angstroms. The energy levels of the excited dye and the band positions of TiO2 and NiO suggest that the electron transfer from the excited dye to the underlying n-type oxide layer occurs by tunneling through the p-type NiO layer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 170, Issue 3, 31 March 2005, Pages 273-278
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 170, Issue 3, 31 March 2005, Pages 273-278
نویسندگان
J. Bandara, U.W. Pradeep, R.G.S.J. Bandara,