CAJ | 학술논문

利用瞬态光电导技术研究了在一个大的偏压范围内染料敏化太阳能电池(DSSC)中的电荷收集和电荷复合过程的动力学。结果表明，在不同的电压下电荷收集速率远快于电荷复合速率，用以解释电荷的收集效率几乎不变。基于这个结果，简化了DSSC二极管特性模型，从而实现了对电流-电压(I-V)曲线的直接拟合。利用这一模型拟合的结果提取出一系列与工作条件下DSSC光电转化过程相关的参数，可以用以描述包括电荷生成、电荷收集和复合以及DSSC器件的整流特性等关键性质。将这一拟合方法应用于不同叔丁基吡啶(TBP)浓度电解液的电池，获得的结果表明，不同TBP浓度可以导致电荷复合速率有较大的差别，但对电荷的收集速率影响甚小，这与I-V曲线拟合的结果非常吻合。同时研究证明TBP浓度对电池的理想因子(m)的影响较为明显，即高浓度TBP的DSSC对应大的m值以及较慢的电荷复合速率。
이용순태광전도기술연구료재일개대적편압범위내염료민화태양능전지(DSSC)중적전하수집화전하복합과정적동역학。결과표명，재불동적전압하전하수집속솔원쾌우전하복합속솔，용이해석전하적수집효솔궤호불변。기우저개결과，간화료DSSC이겁관특성모형，종이실현료대전류-전압(I-V)곡선적직접의합。이용저일모형의합적결과제취출일계렬여공작조건하DSSC광전전화과정상관적삼수，가이용이묘술포괄전하생성、전하수집화복합이급DSSC기건적정류특성등관건성질。장저일의합방법응용우불동숙정기필정(TBP)농도전해액적전지，획득적결과표명，불동TBP농도가이도치전하복합속솔유교대적차별，단대전하적수집속솔영향심소，저여I-V곡선의합적결과비상문합。동시연구증명TBP농도대전지적이상인자(m)적영향교위명현，즉고농도TBP적DSSC대응대적m치이급교만적전하복합속솔。
In the present work, we investigated the dynamics of charge col ection and recombination in dye-sensitized solar cel s (DSSCs) spanning a large region of bias voltages using transient photoconductivity. The rate of charge col ection was much faster than that of charge recombination at varied voltages, which was responsible for the nearly uniform charge col ection efficiency. Based on this result, we simplified the diode characteristic model, which al owed us to directly fit the current-voltage (I-V) curve. A series of parameters related to the photo-to-electric processes in working DSSCs could be extracted from the proposed model, which could be used to evaluate the processes of charge generation, transport, and recombination in DSSCs, as wel as the rectification of DSSC devices. We applied the fitting method to DSSCs with different 4-tert-butyl pyridine (TBP) concentrations of electrolyte. It was found that the rate of charge recombination significantly differed while that of charge col ection was rather constant under different TBP concentrations, which was in good agreement with the results of I-V curve fitting. In addition, this research shows that the change of TBP concentration significantly affects the ideality factor (m) of DSSC devices.