Two-dimensional Platinum Diselenide Waveguide-Integrated Infrared Photodetectors

TL;DR

This paper demonstrates the integration of platinum diselenide (PtSe₂) photodetectors on silicon waveguides, achieving infrared detection with promising responsivity, fast response, and stability, suitable for photonic integrated circuits.

Contribution

It introduces a conformal growth method for PtSe₂ on silicon waveguides, enabling efficient infrared photodetectors with improved performance over traditional transfer methods.

Findings

Operates at 1550 nm with 11 mA/W responsivity

Response times below 8.4 microseconds

Effective infrared detection up to 28 micrometers

Abstract

Low cost, easily integrable photodetectors (PDs) for silicon (Si) photonics are still a bottleneck for photonic integrated circuits (PICs), especially for wavelengths above 1.8 ${\mu}$m. Multilayered platinum diselenide (PtSe$_2$) is a semi-metallic two-dimensional (2D) material that can be synthesized below 450${\deg}$C. We integrate PtSe$_2$ based PDs directly by conformal growth on Si waveguides. The PDs operate at 1550 nm wavelength with a maximum responsivity of 11 mA/W and response times below 8.4 ${\mu}$s. Fourier transform infrared spectroscopy (FTIR) in the wavelength range from 1.25 ${\mu}$m to 28 ${\mu}$m indicates the suitability of PtSe$_2$ for PDs far into the infrared wavelength range. Our PtSe$_2$ PDs integrated by direct growth outperform PtSe$_2$ PDs manufactured by standard 2D layer transfer. The combination of IR responsivity, chemical stability, selective and conformal growth at low temperatures, and the potential for high carrier mobility, make PtSe$_2$ an attractive 2D material for optoelectronics and PICs.