有机/无机杂化钙钛矿太阳能电池S形电流扭结的集总参数等效电路模型

Lumped Parameter Equivalent Circuit Model of S-Shaped Current Kink in Organic/Inorganic Hybrid Perovskite Solar Cells

摘要:

提出一种改进的太阳能电池集总参数等效电路模型，可以实现对S形电流电压曲线的准确拟合。该改进模型使用四个二极管，采用分区和Lambert W函数方法建立结点电压显式算法，获得电流-电压显式方程。与具有多个子电路的电路模型比较，改进模型中加入分流电阻，结构上更加完整。此外，该模型可以描述S形曲线，对较大正向电压下I-V特性第一象限的指数型曲线可实现良好拟合。基于该模型解析求解算法，可避免长时间数值迭代计算，获得满足误差要求的计算结果，利于仿真电路和模型参数提取。

Abstract:

This paper proposes an improved lumped parameter equivalent circuit model of perovskite solar cells， which can accurately fit the S-shaped curves. The improved model establishes the node voltage explicit algorithm by using four diodes， the partitioning method， and Lambert W function. The current-voltage explicit equation is obtained. Compared with the circuit model with multiple sub-circuits， the improved model adds shunt resistance， and the structure is more complete. In addition， the model can describe the S-shaped curve， which can achieve a good fit to the exponential upward bending curves under the large forward voltages in the first quadrant of the I-V characteristics. Based on the model analytical solution algorithm， long-time numerical iterative calculation can be avoided， and calculation results meeting the error requirements can be obtained， which is beneficial to the simulation circuit and model parameter extraction.