Platinum selenide (PtSe₂) is a new 2D transition metal dichalcogenide with tunable bandgap, high carrier mobility, and air stability, which has hopeful applications in high-performance photodetectors and microelectronic devices. However, low response and large dark current caused by the semimetal properties of PtSe₂ limit its applications. In this work, a PtSe₂/MoSe₂ heterojunction photodetector is constructed for high-performance broadband self-powered photodetection. The device exhibits a rectification ratio exceeding 10⁵, achieving an ultralow reverse current of 10^–12 A, and superior photovoltaic performance under illumination. The heterojunction photodetector can respond to a broadband spectrum from visible to near-infrared with an external quantum efficiency (EQE) of 64.2%, a photovoltaic responsivity of 275 mA/W, a photovoltaic specific detectivity of 1.96 × 10¹¹ Jones, and a filling factor of 0.46. In addition, a significant specific detectivity of 1.2 × 10¹³ Jones, a high responsivity of 9.02 × 10³ A/W, and an EQE of 2.1 × 10⁷% were obtained under forward bias (3 V). Moreover, the broadband imaging capability in both biasing and self-powered modes also proves the application potential of the PtSe₂/MoSe₂ heterojunction photodetector. This work highlights the promising potential of 2D transition metal dichalcogenide for broadband, self-powered, and high-performance photodetection.

中文翻译：

---

基于 PtSe2/MoSe2 异质结的高效自供电宽带光电探测器

硒化铂（PtSe ₂）是一种新型二维过渡金属二硫化物，具有带隙可调、高载流子迁移率和空气稳定性，在高性能光电探测器和微电子器件中具有广阔的应用前景。然而，PtSe ₂的半金属特性导致的低响应和大暗电流限制了其应用。在这项工作中，构建了 PtSe ₂ /MoSe ₂异质结光电探测器，用于高性能宽带自供电光电探测。该器件具有超过10 ^{5 的}整流比，实现10 ^–12 A的超低反向电流，并在光照下具有优异的光伏性能。该异质结光电探测器可响应从可见光到近红外的宽带光谱，外量子效率（EQE）为64.2%，光伏响应度为275 mA/W，光伏比探测率为1.96×10 ¹¹ Jones，填充系数为 0.46。此外，在正向偏压（3 V）下，获得了1.2 × 10 ^{13 Jones的显着特异性检测率、9.02 × 10 3} A/W的高响应度和2.1 × 10 ⁷ %的EQE 。此外，偏置和自供电模式下的宽带成像能力也证明了PtSe ₂ /MoSe ₂异质结光电探测器的应用潜力。这项工作凸显了二维过渡金属二硫属化物在宽带、自供电和高性能光电检测方面的巨大潜力。