홍익대학 교 재료공학부 Time Dependent Degradation of Cell in Dye-Sensitized Solar Cell

Abstract>> We report on the time dependent degradation of cell in dye-sensitized solar cells (DSSC). The photovoltaic performance of DSSC over a period of time was investigated in liquid electrolyte based on triiodide/iodide during six days. It was found that the short circuit current density (jsc) of the cell dropped from 9.9 to 7mA/cm2 while efficiency () of the cell decreased from 4.4 to 3.3%. The parameters corresponding to fundamental electronic and ionic processes in a working DSSC are determined from the electrochemical impedance spectrascopy (EIS) at open-circuit potential (Voc). EIS study of the DSSC in the this work showed that the electron life time and chemical capacitance decreased significantly after six days. It was correlated the jsc and efficiency decreased after six days. Key words: DSSC(염 료 감응 형 태 양 전지), degradation(성 능 저하), Electrochemical Impedance spectroscopy(임 피던스), j-V curve(전류-전 압 곡선), efficiency(효율