【摘要】 根据电子在半导体中的扩散方程,对纳米TiO2染料光敏化太阳电池(DSSC)的输出特性(J-V)进行了研究。多孔薄膜TiO2孔隙率(P)直接影响敏化电极光吸收系数(a)以及电子扩散系数(D),将P与a及D的关系式代入扩散方程,得到了电极纳米结构(孔隙率)对电池输出特性(J-V)影响的计算模型。在光电极孔隙率的实验范围(0.41～0.71),进行了模型分析。研究表明,在孔隙率0.41～0.71的范围内,开路电压(VOC)随P值增大基本保持不变,而短路电流(ISC)则随P值增大而明显减小,因此电池的最大输出功率减小,为获得最大输出功率,P应该控制在0.41～0.5。数值模拟与实验数据进行比较,两者符合良好,从而验证了所建立的模型。更多还原

【Abstract】 The output characteristic(J-V) of a TiO2 dye-sensitized solar cell(DSSC) is investigated based on the equation of electron diffusion in semiconductor.As porosity(P) of sensitized TiO2 electrode is related with the electrode light absorption coefficient(a) and electron diffusion coefficient(D),integrating the formulas representing the P-a and P-D relationship into the electron diffusion equation,a theoretical model can be obtained to study the effect of porosity on cell J-V characteristics.Simulations are conducted in the experimental porosity range(0.41-0.71).It is found that in the simulation range,the open-circuit voltage(VOC) remains constant while short circuit current(ISC) decreases significantly with an increase in P,resulting a reduction in the maximum power output,in order to obtain the maximum cell output,P should be in the range of 0.41-0.5.Simulation results fit reasonably well with experimental data and thus validate the proposed model.更多还原