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Ma, Mengru; Chen, Huahan; Zhou, Kunnan; Xie, Chao; Liang, Yi; Wang, Li; Wu, Chunyan; Yang, Wenhua; Guo, Jiawen; Luo, Linbao
Journal of materials chemistry. C, Materials for optical and electronic devices, 03/2021, Volume: 9, Issue: 8Journal Article
Two-dimensional layered (2D) materials are currently attracting intensive research interest for high-performance photodetection and other optoelectronic applications. However, the study of device integration for multifunctional optoelectronic applications is still at a nascent stage. Here, the assembly of a multilayered PtSe 2 /pyramid-Si heterostructure-based photodetector array consisting of 8 × 8 device units is demonstrated. Owing to the pronounced light confinement effect of the heterostructures, the devices present an prominent photovoltaic effect, which enables efficient self-driven photodetection in a broadband wavelength spectrum. The I light / I dark ratio, responsivity, external quantum efficiency (EQE) and specific detectivity can attain values as high as 5.51 × 10 6 , 567 mA W −1 , 87% and 1.26 × 10 13 jones, respectively, upon 810 nm near-infrared (NIR) light illumination. What is more, benefiting from the large-scale homogeneous material growth technique, the photodetector array exhibits excellent uniformity and repeatability in photoresponse performance with negligible unit-to-unit variation. The above characteristics provide the photodetector array with the capability of recording a simple image produced by NIR illumination and monitoring a moving photonic signal, showing the great possibility for NIR image sensing and light trajectory tracking applications.
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