An analysis of carrier dynamics in methylammonium lead triiodide perovskite solar cells using cross correlation noise spectroscopy
An analysis of carrier dynamics in methylammonium lead triiodide perovskite solar cells using cross correlation noise spectroscopy
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DOI：
10.1063/5.0010260
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发表时间：
2020-06-22
影响因子：
4
通讯作者：
Rogachev, Andrey
中科院分区：
文献类型：
--
作者：
Davenport, Kevin;Zhang, Fei;Rogachev, Andrey
利用互相关电流噪声谱技术研究了甲基铵三碘化铅太阳电池中载流子的动力学行为。该方法为具有平面多层结构的器件提供了空间选择性，有效地放大了来自叠层中电阻最大的元件的电流噪声贡献。在所研究的太阳能电池中，我们观察到接近全尺寸的散粒噪声，表明由单个源产生的噪声占主导地位，可能是钙钛矿和螺有机2，2 '，7，7'-四（N，N-二-对甲氧基苯胺）9，9 '-螺二芴空穴传输层之间的界面。我们认为，强1/f噪声项有贡献的钙钛矿层和界面。它显示出对光电流的非理想依赖性，S与I-1.4成比例（而不是通常的S与I-2成比例），这可能是由于电流诱导的卤化物迁移。最后，我们观察到产生-复合噪声。我们认为，这种贡献是由于在钙钛矿体吸收层的双分子复合。外推我们的结果，我们估计，在标准1太阳照明，电子空穴复合时间为5 μ s。由AIP Publishing授权出版。
Using cross correlation current noise spectroscopy, we have investigated carrier dynamics in methylammonium lead triiodide solar cells. This method provides space selectivity for devices with a planar multi-layered structure, effectively amplifying current noise contributions coming from the most resistive element of the stack. In the studied solar cells, we observe near full-scale shot noise, indicating the dominance of noise generation by a single source, likely the interface between the perovskite and the spiro-organic 2,2 ',7,7 '-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9 '-spirobifluorene hole-transport layer. We argue that the strong 1/f noise term has contributions from both the perovskite layer and interfaces. It displays a non-ideal dependence on photocurrent, S proportional to I-1.4 (instead of usual S proportional to I-2), which is likely due to current-induced halide migration. Finally, we observe generation-recombination noise. We argue that this contribution is due to bimolecular recombination in the perovskite bulk absorption layer. Extrapolating our results, we estimate that at standard 1 sun illumination, the electron-hole recombination time is 5 mu s. Published under license by AIP Publishing.