Shift current photovoltaic effect in a ferroelectric charge-transfer complex.
Shift current photovoltaic effect in a ferroelectric charge-transfer complex.
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DOI：
10.1038/s41467-017-00250-y
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发表时间：
2017-08-17
影响因子：
16.6
通讯作者：
Kawasaki M
中科院分区：
文献类型：
--
作者：
Nakamura M;Horiuchi S;Kagawa F;Ogawa N;Kurumaji T;Tokura Y;Kawasaki M
位移电流是非中心对称单晶中产生的稳态光电流，被认为是体光伏效应的主要来源之一。这种效应的机制是光生电荷通过波函数的移动而转移，其幅度与电子源的极化密切相关。在这里，我们报告的光伏效应在有机分子晶体四硫富瓦烯-对氯醌与一个大的铁电极化主要是由分子间的电荷转移。我们观察到一个相当大的零偏置光电流与可见光照射和开关的电流方向的反转的偏振。此外，我们还发现光生载流子的传播距离超过200 μm。这些结果揭示了铁电有机分子化合物在新型光电器件中的潜在应用。体光致发光是指电子在非中心对称晶体中受光辐射而定向移动的效应。在这里，中村等人在铁电有机电荷转移复合物中观察到这种效应，该复合物显示出光生电子的大扩散距离超过200 µm。
Shift current is a steady-state photocurrent generated in non-centrosymmetric single crystals and has been considered to be one of the major origins of the bulk photovoltaic effect. The mechanism of this effect is the transfer of photogenerated charges by the shift of the wave functions, and its amplitude is closely related to the polarization of the electronic origin. Here, we report the photovoltaic effect in an organic molecular crystal tetrathiafulvalene-p-chloranil with a large ferroelectric polarization mostly induced by the intermolecular charge transfer. We observe a fairly large zero-bias photocurrent with visible-light irradiation and switching of the current direction by the reversal of the polarization. Furthermore, we reveal that the travel distance of photocarriers exceeds 200 μm. These results unveil distinct features of the shift current and the potential application of ferroelectric organic molecular compounds for novel optoelectric devices. The bulk photovoltaics refers to an effect whereby electrons move directionally in non-centrosymmetric crystals upon light radiation. Here, Nakamura et al. observe this effect in a ferroelectric organic charge-transfer complex, which shows large diffusion distance of photogenerated electrons over 200 µm.
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