石墨烯叠层遂穿异质结的超宽波段光电转换机理研究

There are urgent needs in the national economy and major military fields for the broad-band optical detection. It is difficult to make the spectral response bandwidth compatible with the photoelectric conversion efficiency for conventional optical detectors. Based on graphene’s broad spectral response and ultrafast carrier mobility, graphene stacked heterostructures with quantum tunneling effect are proposed to build optical detector with broad-band spectral and high sensitivity. The mechanism of broadband spectral absorption is revealed by studying the dynamic modulation characteristics of the absorption peak and coupled modes between the layer. The physical model of carriers transfer is established by adjusting the level of the barrier between the heterojunction and introducing tunneling effect. This work can provide a theoretical basis for understanding the strong interaction between the photon and wide spectrum under a single atomic layer of the film, and provide technical means to develop ultra-wide-band, high-sensitivity optoelectronic devices for the next generation.

宽波段光电探测在国民经济和军事领域具有迫切的重大需求。针对传统光探测器光谱响应带宽与光电转换效率难以兼容的难题，本项目基于石墨烯的宽光谱响应与超快载流子迁移率等特性，结合量子遂穿效应，提出构建石墨烯叠层异质结去实现超度宽波段、高灵敏光谱探测的方法。通过对叠层异质结的吸收峰动态调制特性及层间波导耦合模式的研究，揭示石墨叠层烯异质结宽波段光谱吸收的机理；通过调节异质结能级间势垒引入量子遂穿效应，建立了宽波段下石墨烯叠层异质结中光生载流子传输的物理模型。该研究工作可为理解宽光谱下光子与单原子层薄膜间强相互作用提供理论基础，并未研发下一代超宽波段、高灵敏度光电器件提供技术手段。

宽波段光电探测在国民经济和军事领域具有迫切的重大需求。针对传统光探测器光谱响应带宽与光电转换效率难以兼容的难题，本项目提出利用图形化石墨烯的宽光谱响应与超快载流子迁移率等特性，大幅度动态调整石墨烯的光谱频响范围，结合量子遂穿效应，提高响应灵敏度和降低噪声，构建叠层异质结去实现超度宽波段、高灵敏光谱探测的方法。通过调节异质结能级间势垒引入量子遂穿效应，建立了宽波段下石墨烯叠层异质结中光生载流子传输的物理模型，揭示了石墨叠层烯异质结宽波段光谱响应与吸收的机理；该研究工作可为理解宽光谱下光子与单原子层薄膜间强相互作用提供理论基础，并未研发下一代超宽波段、高灵敏度光电器件提供技术储备。