College of Engineering, IT and Environment, Charles Darwin University, Darwin, NT 0909, Australia.
Chemphyschem. 2019 Oct 16;20(20):2712-2717. doi: 10.1002/cphc.201801038. Epub 2019 Feb 7.
The diffusion length of charge carriers in the active layer of a perovskite solar cell (PSC) of the structure Glass/PEDOT: PSS/CH NH PbI /PC60BM/Al is modelled. It is found that the diffusion length depends on the position x in the active layer measured from the PEDOT: PSS interface, Urbach energy and temperature. By varying the voltage in the range from zero to , it is shown that the dependence of diffusion length on the position x in the active layer reduces at higher voltage. The combined influence of applied voltage and temperature on the diffusion length of charge carriers is investigated and it is found that in the low voltage range the diffusion length is temperature independent, but it becomes significantly temperature dependent at higher voltages. Also, it is found that the diffusion length decreases as the applied voltage increases and this reduction becomes much more significant at higher voltage and temperatures. The combined influence of applied voltage and Urbach energy on diffusion length of charge carriers reveals that the diffusion length decreases when both the applied voltage and Urbach energy increase. However, the reduction in the diffusion length due to the increase in Urbach energy becomes less significant at higher voltage.
对结构为 Glass/PEDOT:PSS/CH3NH3PbI3/PC60BM/Al 的钙钛矿太阳能电池（PSC）活性层中的载流子扩散长度进行了建模。结果表明，扩散长度取决于从 PEDOT:PSS 界面测量的活性层中的位置 x、Urbach 能和温度。通过在 0 到 范围内改变电压，表明在较高电压下，扩散长度对活性层中位置 x 的依赖性降低。研究了外加电压和温度对载流子扩散长度的综合影响，发现较低电压范围内，扩散长度与温度无关，但在较高电压下，扩散长度变得明显依赖于温度。此外，还发现随着外加电压的增加，扩散长度减小，并且在较高电压和温度下，这种减小变得更加显著。外加电压和 Urbach 能对载流子扩散长度的综合影响表明，当外加电压和 Urbach 能增加时，扩散长度减小。然而，随着 Urbach 能的增加，扩散长度的减小幅度在较高电压下变得不那么显著。
