Photoconductivity, pyroconductivity, and pyroelectricity effects in photodetection of layer-structured CuInP2S6/MoS2 heterojunction

光探测 光电导性 热电性 光电子学 材料科学 响应度 异质结 光电探测器 比探测率 量子效率 光电效应 铁电性 光伏系统 生态学 生物 电介质
作者
Dan Qiu,Pengfei Hou,Jinbin Wang,Xiaoping Ouyang
出处
期刊:Applied Physics Letters [American Institute of Physics]
卷期号:123 (4) 被引量:4
标识
DOI:10.1063/5.0159625
摘要

Layer-structured ferroelectric material-modulated heterojunctions are promising for use as photodetectors. However, the mechanism behind their photodetection performance, including photoconductivity, pyroconductivity, and pyroelectricity effects, has not yet been fully studied. Herein, we present a CuInP2S6/MoS2 heterojunction with a layered structure, in which the narrow bandgap of MoS2 extends the detection wavelength range with a specific detectivity (D*) of 108–1010 Jones. The pyroelectric effect, dominated by polarization, introduces significant current peaks and valleys when the light is turned on and off. A competitive mechanism is discovered among the photoconductivity, pyroconductivity, and pyroelectricity effects. At low optical power intensities, the pyroconductivity effect is dominant under 405 nm light, while the pyroelectricity effect dominates under 808 nm light. However, at high optical power intensities, both the photoconductivity and pyroconductivity effects become dominant, regardless of the light wavelength. The responsivity (R), external quantum efficiency (EQE), and D* of the CuInP2S6/MoS2 heterojunction are two orders of magnitude for 405 nm light compared to 808 nm light. These results not only demonstrate the coupling effect among the photoconductivity, pyroconductivity, and pyroelectricity effects in the photodetection of layer-structured CuInP2S6/MoS2 heterojunctions but also highlight the potential applications of these heterojunctions in multifunctional devices, provided that these effects can be clearly distinguished.
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