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首页> 外文期刊>Advanced Science >Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells
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Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells

机译：钙钛矿太阳能电池电子缺陷态分布与器件性能的相关性

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Abstract In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH 3 NH 3 PbI 3 -based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, and electron?￠????phonon scattering, is formulated evidencing how the presence of shallow and deeper band tail states influences the solar cell recombination losses. At low temperatures, the observed cascade capture process indicates that the trapping of the charge carriers by shallow defects is phonon assisted directly followed by their recombination. By increasing the temperature, a phase modification of the CH 3 NH 3 PbI 3 absorber layer occurs and for temperatures above the phase transition at about 160 K the capture of the charge carrier takes place in two steps. The electron is first captured by a shallow defect and then it can be either emitted or thermalize down to a deeper band tail state and recombines subsequently. This result reveals that in perovskite solar cells the recombination kinetics is strongly influenced by the electron?￠????phonon interactions. A clear correlation between the morphological structure of the perovskite grains, the energy disorder of the defect states, and the device performance is demonstrated.
机译：摘要在本研究中，使用在不同温度和不同照度下测得的随机电流波动来了解基于甲基铵碘化铅CH 3 NH 3 PbI 3的钙钛矿太阳能电池的电荷载流子动力学。建立了一个结合了俘获/去俘获，重组机制和电子￠声子散射的模型，以证明浅带和深带尾态的存在如何影响太阳能电池的重组损失。在低温下，观察到的级联捕获过程表明，由浅缺陷捕获的电荷载流子是声子直接辅助的声子，然后再进行复合。通过升高温度，发生CH 3 NH 3 PbI 3吸收层的相变，并且对于高于约160 K的相变的温度，电荷载流子的捕获分两步进行。电子首先被浅缺陷捕获，然后可以被发射或被热化为更深的带尾态，随后重新结合。该结果表明，在钙钛矿型太阳能电池中，重组动力学受电子，声子，声子和声子相互作用的强烈影响。钙钛矿晶粒的形态结构，缺陷态的能量无序与器件性能之间存在明显的相关性。

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