Enhanced negative terahertz photoconductivity enabled by interfacial charge transfer in Te/graphene mixed-dimensional heterojunction

作者：Pujing Zhang, Longyu Shi, Zhiyuan Zhang, Huiwen Shi, Haojing Wang, Guangwei She, Peijie Wang, Wensheng Shi, Cunlin Zhang, Qingli Zhou · 发表于：Applied Physics Letters · 年份：2025 · DOI：10.1063/5.0290557 · 被引用次数：2 · 研究领域：2D Materials and Applications、Topological Materials and Phenomena、Advanced Semiconductor Detectors and Materials

Negative terahertz photoconductivity is a rare effect that holds great significance for numerous applications. However, the maintenance and enhancement of negative photoconductivity response still face a huge challenge. Here, combined with material selection and band alignment engineering, we have proposed a mixed-dimensional heterostructure comprised of 1D tellurium (Te) nanowires and 2D monolayer graphene. Intriguingly, the Te/graphene heterojunction could enhance negative terahertz photoconductivity by twice compared with graphene, following a transition from negative to positive photoconductivities. We have further performed first-principles calculations and characterizations to elucidate the type-I band alignment at the heterointerface, revealing the phenomena attributed to interfacial charge transfer. Our results provide in-depth physical insights into the carrier transport mechanism, which is crucial for further exploration of optoelectronic devices based on mixed-dimensional heterostructures.