Abstract Piezo-phototronic effect has been extensively investigated for the third generation semiconductor nanowires. Here, we present a demonstration that piezo-phototronic effect can even be applied to tune polarization-sensitive photodetectors based on cation-mixed organic–inorganic perovskite nanowires. A big anisotropic photoluminescence (PL) with linearly polarized light-excitation was found due to a strong spontaneous piezoelectric polarization besides the anisotropic crystal structure and morphology. The piezo-phototronic effect was utilized to tune the PL intensity, and an improved anisotropic PL ratio from 9.36 to 10.21 for linearly polarized light-excitation was obtained thanks to the modulation by piezo-potential. And a circularly polarization-sensitive PL characterized with circular dichroism ratio was also discovered, which was found to be modulated from 0.085 to 0.555 (with a 5.5-fold improvement) within the range of applied strain. The circular dichroism was resulted from the joint effects of the modulated Rashba spin–orbit coupling and the asymmetric carriers separation and recombination for right- and left-handed helicity due to the presence of effective piezo-potential. These findings not only reveal the promising optoelectronic applications of piezo-phototronic effect in perovskite-based polarization-sensitive photodetectors, but also illuminate fundamental understandings of their polarization properties of perovskite nanowires.

中文翻译：

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基于阳离子混合有机-无机钙钛矿纳米线的压电光电效应增强偏振敏感光电探测器

摘要 第三代半导体纳米线的压电光电效应已得到广泛研究。在这里，我们展示了压电光电效应甚至可以用于调整基于阳离子混合有机-无机钙钛矿纳米线的偏振敏感光电探测器。除了各向异性晶体结构和形态外，由于强烈的自发压电极化，发现了具有线极化光激发的大的各向异性光致发光 (PL)。利用压电光电效应来调节 PL 强度，由于压电电位的调制，线性偏振光激发的各向异性 PL 比从 9.36 提高到 10.21。并且还发现了以圆二色比为特征的圆偏振敏感PL，发现在施加的应变范围内从 0.085 调制到 0.555（提高了 5.5 倍）。由于有效压电电位的存在，圆二色性是由调制的 Rashba 自旋轨道耦合和不对称载流子分离和重组的右旋和左旋螺旋的共同作用产生的。这些发现不仅揭示了压电光电效应在基于钙钛矿的偏振敏感光电探测器中的有前景的光电应用，而且阐明了对钙钛矿纳米线偏振特性的基本理解。由于有效压电电位的存在，圆二色性是由调制的 Rashba 自旋轨道耦合和不对称载流子分离和重组的右旋和左旋螺旋的共同作用产生的。这些发现不仅揭示了压电光电效应在基于钙钛矿的偏振敏感光电探测器中的有前景的光电应用，而且阐明了对钙钛矿纳米线偏振特性的基本理解。由于有效压电电位的存在，圆二色性是由调制的 Rashba 自旋轨道耦合和不对称载流子分离和重组的右旋和左旋螺旋的共同作用产生的。这些发现不仅揭示了压电光电效应在基于钙钛矿的偏振敏感光电探测器中的有前景的光电应用，而且阐明了对钙钛矿纳米线偏振特性的基本理解。