The emerging capability to detect light over a broad spectral range is a key to technological applications in sensing, spectroscopy, imaging and communications. Colloidal semiconductor nanocrystal/graphene van der Waals heterojunctions provide a unique scheme that combines the spectral tunability and strong quantum confinement of the semiconductor nanocrystals sensitizers with superior charge mobility of graphene for extraordinary photoconductive gains. While high responsivity has been demonstrated, the spectral range is typically narrow limited by the cutoff of the semiconductor band gap of the nanocrystals. Here, a broadband photosensitizer is reported, based on doped Iron Pyrite nanocubes (FeS₂ NCs) that exhibit strong localized surface plasmonic resonance (LSPR) spanning across ultraviolet through visible to near‐infrared (UV–Vis–NIR). Using the printed LSPR FeS₂ NCs/graphene van der Waals heterostructure, a broadband UV–Vis–NIR photoresponsivity in exceeding 1.08 × 10⁶ A/W has been demonstrated through development of a ligand‐exchange process to facilitate efficient charge transfer at the LSPR FeS₂ NCs/graphene interface. This result demonstrates the viability of the LSPR semiconductor nanocrystal/graphene van der Waals heterostructure for high‐performance broadband optoelectronics with scalability through direct printing.

中文翻译：

---

掺杂的铁黄铁矿纳米晶体中的局部表面等离子体共振实现的宽带光电探测器。

在广阔的光谱范围内检测光的新兴能力是传感，光谱学，成像和通信技术应用的关键。胶体半导体纳米晶体/石墨烯范德华异质结提供了一种独特的方案，该方案结合了半导体纳米晶体敏化剂的光谱可调性和强量子限制性以及石墨烯的优异电荷迁移率，从而获得了非凡的光电导增益。尽管已经证明了高响应性，但是光谱范围通常狭窄，这受限于纳米晶体的半导体带隙的截止。在此，据报道，宽带光敏剂基于掺杂的黄铁矿纳米立方体（FeS ₂NCs）表现出很强的局部表面等离子体共振（LSPR），跨越整个紫外线范围，从可见光到近红外（UV-Vis-NIR）。使用印刷的LSPR FeS ₂ NCs /石墨烯范德华异质结构，通过开发配体交换过程以促进LSPR上的有效电荷转移，证明了宽带UV-Vis-NIR光响应性超过1.08×10 ⁶ A / W。 FeS ₂ NCs /石墨烯界面。该结果证明了LSPR半导体纳米晶体/石墨烯范德华异质结构对于高性能宽带光电子学的可行性，并可以通过直接印刷实现可扩展性。