Quantitative analysis of the transient photoluminescence of CH3NH3PbI3/PC61BM heterojunctions by numerical simulations
Quantitative analysis of the transient photoluminescence of CH3NH3PbI3/PC61BM heterojunctions by numerical simulations
复制标题
DOI：
10.1039/c7se00603a
复制
发表时间：
2018-05-01
影响因子：
5.6
通讯作者：
Kirchartz, Thomas
中科院分区：
文献类型：
--
作者：
Krogmeier, Benedikt;Staub, Florian;Kirchartz, Thomas
具有电子或空穴传输层的卤化铅钙钛矿层的瞬时光致发光测量提供了对界面电荷转移和复合过程的深入了解。然而，在广泛的时间范围内分析描述这些测量结果是复杂的，因为不同的物理效应的组合，例如钙钛矿内部的传输、向传输层的传输、电荷的积累和界面处的复合。因此，我们使用数值漂移扩散模拟光致发光随激光通量和界面性质的变化，以获得对实验结果的定量理解。通过实验和模拟的比较，并结合结果的唯一性分析，得出了钙钛矿-PC61BM界面的界面结合速度必须在200 cm S 1左右，才能与在几个激光通量下获得的数据一致。
Transient photoluminescence measurements of lead-halide perovskite layers with electron or hole transport layers provide insights into the interfacial charge transfer and recombination processes. However, analytically describing these measurements over a wide range of timescales is complicated by the combination of different physical effects such as transport within the perovskite, transfer to the transport layer, accumulation of charges and recombination at the interface. Therefore, numerical driftdiffusion simulations of photoluminescence transients as a function of laser fluence and interface properties are used to obtain a quantitative understanding of experimental results. Comparison between experiment and simulation combined with an analysis of the uniqueness of the result yields an interfacerecombination velocity that has to be around 200 cm s 1 for the perovskite-PC61BM interface in order to be consistent with data obtained at several laser fluences.