论文标题
由理想因素的开路电压依赖性揭示的有机太阳能电池中状态的幂律密度
Power-law density of states in organic solar cells revealed by the open-circuit voltage dependence of the ideality factor
论文作者
论文摘要
状态（DOS）的密度对于理解有机无序半导体的物理过程至关重要，但很难在实验上确定。我们通过考虑通过尾部状态重组以及使用温度和开路电压（$ v_ \ mathrm {oc} $）依赖有机太阳能电池中理想因素的依赖性来评估DOS。通过执行Suns- $ V_ \ Mathrm {OC} $测量值，我们发现高斯和指数分布仅描述DOS仅在给定的Quasi-Fermi级分配中。 DOS宽度随DOS深度线性增加，从而揭示了这些材料中的幂律DOS。
The density of states (DOS) is fundamentally important for understanding physical processes in organic disordered semiconductors, yet hard to determine experimentally. We evaluated the DOS by considering recombination via tail states and using the temperature and open-circuit voltage ($V_\mathrm{oc}$) dependence of the ideality factor in organic solar cells. By performing Suns-$V_\mathrm{oc}$ measurements, we find that gaussian and exponential distributions describe the DOS only at a given quasi-Fermi level splitting. The DOS width increases linearly with the DOS depth, revealing the power-law DOS in these materials.
