黑砷磷室温太赫兹探测器

Room-temperature terahertz photodetectors based on black arsenic-phosphorus

由于太赫兹波与众多物质之间存在着丰富的相互作用,太赫兹技术在众多领域均有应用需求。因此,基于独特物理机制和优异材料特性的高灵敏度、便携式太赫兹探测器的研制刻不容缓。黑砷磷是一种新型二维材料,其带隙和输运特性随化学组分可调,在光电探测领域被广泛关注。目前基于黑砷磷的研究集中在红外探测方面,而对于太赫兹探测的应用未见报道。本文介绍了一种基于黑砷磷的天线耦合太赫兹探测器。实验结果表明,在探测过程中存在两种不同的探测机制,并且两者之间存在竞争关系。通过改变黑砷磷的化学组分可以定制不同的探测机制,使其达到最优响应性能。在平衡材料带隙和载流子迁移率的情况下,探测器实现了室温下对0.37 THz电磁波的灵敏探测,其电压响应度和噪声等效功率分别为28.23 V/W和0.53 nW/Hz1/2。

Terahertz technology is indispensable in plenty of fields due to the abundant interactions between terahertz waves and matter.In order to meet the needs of terahertz applications,the development of highly sensitive and portable terahertz detectors based on distinctive physical mechanisms and various materials with excellent properties are urgently required.Black arsenic-phosphorus is a novel two-dimensional material that has a tunable band gap and transport characteristics with varying chemical composition,which has gained widespread interest in optoelectronic applications.Recent research on b-AsxP1-x mainly focuses on infrared detection,while the detection of terahertz has not yet been applied.Herein,an antenna-coupled terahertz detector based on exfoliated multilayer black arsenic-phosphorus is demonstrated.The terahertz response performance of the detector reflects two different mechanisms,which have a competitive relationship in the detection process.In particular,the detection mechanism can be tailored by varying the chemical composition of black arsenic-phosphorus.By balancing the band gap and carrier mobility,a responsivity of over 28.23 V/W and a noise equivalent power of less than 0.53 nW/Hz1/2 are obtained at 0.37 THz.This implies that black arsenic-phosphorus has great potential in terahertz technology.