论文标题
填充因子损失和偏离二甲酯钙钛矿太阳能电池中的叠加原理的偏差
Fill Factor Losses and Deviations from the Superposition Principle in Lead-Halide Perovskite Solar Cells
论文作者
论文摘要
当前一代钙钛矿太阳能电池中填充因子的增强是进一步提高效率的关键。因此，迫切需要量化填充因子损失的方法。一种量化太阳能电池中欧姆和非欧马电阻损失的经典方法是基于黑暗中的电压和在相等重组电流密度下分析的照明之间的比较。应用于钙钛矿太阳能电池，我们观察到欧姆串联电阻的组合与电压依赖性电阻，在短路和低向前偏置上最突出。后者很可能是由于电子和/或孔传输层的运输特性不良引起的。通过测量钙钛矿太阳能电池的光致发光作为应用电压的函数，我们为低和中度向前偏置的高准纤维FERMI水平分裂提供了直接证据，该偏置基本上超过了外部施加的电压。这种准弗米水平分裂会导致重组损失，因此降低了短路电流和太阳能电池的填充因子。
The enhancement of the fill factor in the current generation of perovskite solar cells is the key for further efficiency improvement. Thus, methods to quantify the fill factor losses are urgently needed. A classical method to quantify Ohmic and non-Ohmic resistive losses in solar cells is based on the comparison between the voltage in the dark and under illumination analysed at equal recombination current density. Applied to perovskite solar cells, we observe a combination of an Ohmic series resistance with a voltage-dependent resistance that is most prominent at short circuit and low forward bias. The latter is most likely caused by the poor transport properties of the electron and/or hole transport layers. By measuring the photoluminescence of perovskite solar cells as a function of applied voltage, we provide direct evidence for a high quasi-Fermi level splitting at low and moderate forward bias that substantially exceeds the externally applied voltage. This quasi-Fermi level splitting causes recombination losses and, thus, reduces both the short-circuit current and the fill factor of the solar cell.
