A high-performance and broadband heterojunction photodetector has been successfully fabricated. The heterostructure device is based on a uniform and pinhole-free perovskite film constructed on top of a single-crystal germanium layer. The perovskite/germanium photodetector shows enhanced performance and a broad spectrum compared with the single-material-based device. The photon response properties are characterized in detail from the visible to near-infrared spectrum. At an optical fibre communication wavelength of 1550 nm, the heterojunction device exhibits the highest responsivity of 1.4 A/W. The performance is promoted because of an antireflection perovskite coating, the thickness of which is optimized to 150 nm at the telecommunication band. At a visible light wavelength of 680 nm, the device shows outstanding responsivity and detectivity of 228 A/W and 1.6 × 10¹⁰ Jones, respectively. These excellent properties arise from the photoconductive gain boost in the heterostructure device. The presented heterojunction photodetector provides a competitive approach for wide-spectrum photodetection from visible to optical communication areas. Based on the distinguished capacity of light detection and harvesting from the visible to near-infrared spectrum, the designed germanium/perovskite heterostructure configuration is believed to provide new building blocks for novel optoelectronic devices.

高性能，宽带异质结光电探测器已经成功制造。异质结构器件基于构造在单晶锗层顶部的均匀且无针孔的钙钛矿薄膜。与基于单一材料的设备相比，钙钛矿/锗光电探测器显示出更高的性能和更广的光谱范围。从可见光谱到近红外光谱对光子响应特性进行了详细描述。在1550 nm的光纤通信波长下，异质结器件显示出1.4 A / W的最高响应度。由于抗反射钙钛矿涂层的性能得以提高，该涂层在电信频段的厚度最优化为150 nm。在680 nm的可见光波长下，分别是¹⁰琼斯。这些优异的性能来自异质结构器件中的光电导增益提高。提出的异质结光电探测器为从可见光到光通信领域的广谱光电探测提供了一种竞争性方法。基于从可见光谱到近红外光谱的出色的光检测和收集能力，据信设计的锗/钙钛矿异质结构可为新型光电器件提供新的构建基块。