近日，复旦大学的黄高山及其研究团队取得一项新进展。经过不懈努力，他们实现具有几何诱导能量局域化的自滚碲光电探测器的增强光热电转换。相关研究成果已于2024年7月4日在国际知名学术期刊《光：科学与应用》上发表。

在本研究中，研究人员实现了具有PTE效应的自滚管状碲(Te)光电探测器的光电压响应性提高了两个数量级。在光照条件下，管状器件的最大光电压响应度为252.13VW^-1，探测率为1.48 × 10¹¹ 琼斯。通过理论模拟，研究人员揭示了管状结构中PTE转化的机理。此外，该器件在广角和偏振相关检测方面表现出优异的性能。这项工作提出了一种通过集中光和产生的相应热来显著提高光电探测器性能的方法，并且所提出的自滚器件在下一代片上光电探测中具有显著的前景。

据悉，光探测在信息传输方面受到了广泛的关注。虽然实现主要依赖于光子探测器，但它们主要受到活性材料的本征带隙的限制。另一方面，由于温差引起的自驱动光伏，光热电(PTE)探测器因其在宽带探测方面的前景而获得了大量的研究兴趣。为了获得更高的性能，将光能和热能局部化以实现高效转换是至关重要的。然而，对于PTE探测器在微纳尺度上的能量转换研究还很有限。

附：英文原文

Title: Enhanced photothermoelectric conversion in self-rolled tellurium photodetector with geometry-induced energy localization

Author: Huang, Jiayuan, You, Chunyu, Wu, Binmin, Wang, Yunqi, Zhang, Ziyu, Zhang, Xinyu, Liu, Chang, Huang, Ningge, Zheng, Zhi, Wu, Tingqi, Kiravittaya, Suwit, Mei, Yongfeng, Huang, Gaoshan

Issue&Volume: 2024-07-04

Abstract: Photodetection has attracted significant attention for information transmission. While the implementation relies primarily on the photonic detectors, they are predominantly constrained by the intrinsic bandgap of active materials. On the other hand, photothermoelectric (PTE) detectors have garnered substantial research interest for their promising capabilities in broadband detection, owing to the self-driven photovoltages induced by the temperature differences. To get higher performances, it is crucial to localize light and heat energies for efficient conversion. However, there is limited research on the energy conversion in PTE detectors at micro/nano scale. In this study, we have achieved a two-order-of-magnitude enhancement in photovoltage responsivity in the self-rolled tubular tellurium (Te) photodetector with PTE effect. Under illumination, the tubular device demonstrates a maximum photovoltage responsivity of 252.13VW^-1 and a large detectivity of 1.48 × 10¹¹ Jones. We disclose the mechanism of the PTE conversion in the tubular structure with the assistance of theoretical simulation. In addition, the device exhibits excellent performances in wide-angle and polarization-dependent detection. This work presents an approach to remarkably improve the performance of photodetector by concentrating light and corresponding heat generated, and the proposed self-rolled devices thus hold remarkable promises for next-generation on-chip photodetection.

DOI: 10.1038/s41377-024-01496-0

Source: https://www.nature.com/articles/s41377-024-01496-0