Charge carrier recombination dynamics in perovskite and polymer solar cells
Charge carrier recombination dynamics in perovskite and polymer solar cells
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DOI：
10.1063/1.4944044
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发表时间：
2016-03-14
影响因子：
4
通讯作者：
Neher, Dieter
中科院分区：
文献类型：
--
作者：
Paulke, Andreas;Stranks, Samuel D.;Neher, Dieter
延时收集场实验应用于平面有机金属卤化物钙钛矿（CH 3 NH3 PbI 3）为基础的太阳能电池，以研究在纳秒到微秒的时间尺度上完全工作的太阳能电池中的电荷载流子复合。对于测试的所有通量和时间尺度，移动的（可提取的）电荷的重组均遵循二阶重组动力学。最重要的是，双分子复合系数被发现是时间依赖性的，与初始值约。10（-9）cm（3）/s，并且在最初的几十纳秒内逐渐减小。与原型有机体异质结器件PTB 7：PC 71 BM相比，自由载流子复合的机制和时间尺度产生了重要的差异。(C)2016 AIP Publishing LLC.
Time-delayed collection field experiments are applied to planar organometal halide perovskite (CH3NH3PbI3) based solar cells to investigate charge carrier recombination in a fully working solar cell at the nanosecond to microsecond time scale. Recombination of mobile (extractable) charges is shown to follow second-order recombination dynamics for all fluences and time scales tested. Most importantly, the bimolecular recombination coefficient is found to be time-dependent, with an initial value of ca. 10(-9) cm(3)/s and a progressive reduction within the first tens of nanoseconds. Comparison to the prototypical organic bulk heterojunction device PTB7:PC71BM yields important differences with regard to the mechanism and time scale of free carrier recombination. (C) 2016 AIP Publishing LLC.