کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
190919 459710 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of iodine concentration on the photoelectrochemical performance of dye-sensitized solar cells containing non-volatile electrolyte
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Influence of iodine concentration on the photoelectrochemical performance of dye-sensitized solar cells containing non-volatile electrolyte
چکیده انگلیسی

The effect of iodine concentration in the electrolyte with non-volatile solvent of dye-sensitized solar cells (DSCs) on photovoltaic performance was studied. The electron transport and interfacial recombination kinetics were also systematically investigated by electron impedance spectroscopy (EIS). With the iodine concentration increased from 0.025 to 0.1 M, open-circuit voltage (Voc) and photocurrent density (Jsc) decreased while fill factor (ff) increased significantly. The decline of the Voc and Jsc was mainly ascribed to increased electron recombination with tri-iodide ions (I3−). The increased fill factor was primarily brought by a decrease in the total resistance. From impedance spectra of the solar cells, it can be concluded that increasing the iodine concentration in electrolytes could decrease charge transfer resistance (Rct) and the chemical capacitance (Cμ), increase the electron transport resistance (Rt), and hence decrease the electron lifetime (τ) and the effective diffusion coefficient (Dn) of electrons in the TiO2 semiconductor. With optimum iodine concentration, device showed a photocurrent density of 16.19 mA cm−2, an open-circuit voltage of 0.765 V, a fill factor of 0.66, and an overall photo-energy conversion efficiency of 8.15% at standard AM 1.5 simulated sunlight (100 mW cm−2).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 55, Issue 24, 1 October 2010, Pages 7225–7229
نویسندگان
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