External Field-Tunable Internal Orbit–Orbit Interaction in Flexible Perovskites,The Journal of Physical Chemistry Letters

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External Field-Tunable Internal Orbit–Orbit Interaction in Flexible Perovskites
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-11-23 , DOI: 10.1021/acs.jpclett.0c02934
Qi Zhang ₁ , Haomiao Yu ₁ , Liying Pei ₁ , Jinpeng Li ₁ , Kai Wang ₁ , Jia Zhang ₂ , Miaosheng Wang ₂ , Bin Hu ₂

Affiliation

In hybrid metal halide perovskites, electrons carry both orbital and spin momenta through s–p wave function hybridization. This leads to a hypothesis that the orbit–orbit interaction between excitons can occur through orbital magnetic dipoles forming short-range interaction or through orbital polarizations forming long-range interaction to influence optoelectronic properties. This Letter reports an interesting phenomenon: the orbit–orbit interaction can be electrically switched between orbital magnetic dipoles and orbital polarizations in a flexible perovskite (MAPbI_3–xCl_x) solar cell by scanning an external voltage between forward and reverse biases (0.2 and −0.2 V). Essentially, this phenomenon presents an external mechanism for electrically controlling the internal orbit–orbit interaction in hybrid perovskites. It was further observed that this bias-switchable orbit–orbit interaction is sensitive to temperature, becoming negligible when the temperature is decreased from 300 to 250 K. This observation indicates that the mobile ions driven by an external electrical field provide an intrinsic mechanism for electrically switching the orbit–orbit interaction through polarization and spin parameters while applying an external voltage between forward and reverse biases. These results provide a comprehensive understanding of tuning the orbit–orbit interaction in flexible perovskites toward developing orbitronic actions.

中文翻译：

钙钛矿中外部场可调内部轨道-轨道相互作用

在杂化金属卤化物钙钛矿中，电子通过s–p波函数杂交同时携带轨道和自旋矩。这导致一个假设，即激子之间的轨道-轨道相互作用可以通过形成短程相互作用的轨道磁偶极子或通过形成长程相互作用的轨道极化发生，从而影响光电性能。这封信报道了一个有趣的现象：在柔性钙钛矿中，轨道-轨道相互作用可以在轨道磁偶极子和轨道极化之间电切换（MAPbI _{3– x} Cl _x通过扫描正向和反向偏置（0.2和-0.2 V）之间的外部电压来检测太阳能电池。本质上，这种现象提出了一种用于电控制杂化钙钛矿内部轨道-轨道相互作用的外部机制。进一步观察到，这种可偏置切换的轨道-轨道相互作用对温度敏感，当温度从300 K降至250 K时，该相互作用可忽略不计。该观察结果表明，由外部电场驱动的移动离子为电提供了一种内在机理通过极化和自旋参数切换轨道间的相互作用，同时在正向和反向偏置之间施加外部电压。这些结果提供了全面了解如何调整柔性钙钛矿中轨道与轨道之间的相互作用以发展双电子相互作用的方法。

更新日期：2020-12-17

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