Black Phosphorus Photodetector for Multispectral, High-Resolution Imaging

作者：Engel, Michael; Steiner, Mathias^*; Avouris, Phaedon

来源：Nano Letters, 2014, 14(11): 6414-6417.

DOI：10.1021/nl502928y

• Black phosphorus
• photodetector
• imaging
• near-infrared
• optoelectronics

Black phosphorus is a layered semiconductor that is intensely researched in view of applications in optoelectronics. In this letter, we investigate a multilayer black phosphorus photodetector that is capable of acquiring high-contrast (V > 0.9) images both in the visible (lambda(VIS) = 532 nm) as well as in the infrared (lambda(IR) = 1550 nm) spectral regime. In a first step, by using photocurrent microscopy, we map the active area of the device and we characterize responsivity and gain. In a second step, by deploying the black phosphorus device as a point-like detector in a confocal microsope setup, we acquire diffraction-limited optical images with submicron resolution. The results demonstrate the usefulness of black phosphorus as an optoelectronic material for hyperspectral imaging applications.

• 出版日期2014-11