Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations
Tuning spin-orbit coupling towards enhancing photocurrent in hybrid organic-inorganic perovskites by using mixed organic cations
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DOI：
10.1016/j.orgel.2020.105671
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发表时间：
2020-06-01
影响因子：
3.2
通讯作者：
Hu, Bin
中科院分区：
文献类型：
--
作者：
Dou, Yixuan;Xu, Hengxing;Hu, Bin
重元素的存在导致了有机-无机杂化钙钛矿（HOIPs）中强烈的自旋轨道耦合（SOC），这种耦合通过改变亮态和暗态之间的居群对HOIPs的光伏性能起着重要作用。有机阳离子是一种关键成分，通过与无机笼的相互作用影响有机碳。在这项工作中，我们使用磁光电流测量来探索混合有机阳离子（甲基铵（MA）和甲脒（FA））在Pb基钙钛矿中具有不同偶极矩时的SOC效应。磁光电流测量表明，随着MA/FA比的降低，内部磁参数B-0从402.41 mT降低到180.18 mT和104.58 mT。这证明了通过使用混合有机阳离子改变内部偶极矩可以从根本上改变HOIPs的SOC。同时，当mA/ FA比值由1:0变为0.9:0.1和0.7:0.3时，光电流由21.46 mA/cm(2)增加到22.60 mA/cm(2)和23.08 mA/cm(2)。综上所述，我们的研究结果表明，不同有机阳离子的变化也可能是影响钙钛矿太阳能电池性能的一个因素。
The presence of the heavy elements leads to strong spin-orbit coupling (SOC) in hybrid organic-inorganic perovskites (HOIPs), which plays an important role in the photovoltaic performance of HOIPs by changing the populations between bright and dark states. The organic cation is a critical composition and affects SOC via the interaction with the inorganic cage. In this work, we use magneto-photocurrent measurement to explore the SOC effect upon using mixed organic cations (methylammonium (MA) and formamidinium (FA)) with different dipole moments in Pb based perovskites. Magneto-photocurrent measurements showed that the internal magnetic parameter B-0 is decreased from 402.41 mT to 180.18 mT and 104.58 mT with decreasing the MA/FA ratio. This provides evidence that changing the internal dipole moment by using mixed organic cations can essentially change the SOC in HOIPs. Simultaneously, the photocurrent is increased from 21.46 mA/cm(2) to 22.60 mA/cm(2) and 23.08 mA/cm(2) when the MA/FA ratio is changed from 1:0 to 0.9:0.1 and 0.7:0.3. Above all, our results indicate that the change in SOC by different organic cations can also be a factor affecting the performance of perovskite solar cells.