Effective photoconductivity of exfoliated black phosphorus for optoelectronic switching under 1.55 μm optical excitation Effective photoconductivity of exfoliated black phosphorus for optoelectronic switching under 1.55 lm optical excitation

A Penillard (1) , C Tripon-Canseliet (1) , M Rosticher (2) , I Maksimovic (1) , Z Liu (3) , E G Géron (1)

1 LPEM - Laboratoire de Physique et d'Etude des Matériaux (UMR 8213)
2 LPA - Laboratoire Pierre Aigrain
3 NTU - Nanayang Technological University

We present a microwave photoconductive switch based on exfoliated black phosphorus and strongly responding to a 1.55 lm optical excitation. According to its number of atomic layers, exfoliated black phosphorus presents unique properties for optoelectronic applications, like a tunable direct bandgap from 0.3 eV to 2 eV, strong mobilities, and strong conductivities. The switch shows a maximum ON/OFF ratio of 17 dB at 1 GHz, and 2.2 dB at 20 GHz under 1.55-lm laser excitation at 50 mW, never achieved with bidimensional materials.

Domaines: Optique [physics.optics]

A Penillard, C Tripon-Canseliet, M Rosticher, I Maksimovic, Z Liu, et al.. Effective photoconductivity of exfoliated black phosphorus for optoelectronic switching under 1.55 μm optical excitation Effective photoconductivity of exfoliated black phosphorus for optoelectronic switching under 1.55 lm optical excitation. Journal of Applied Physics, 2016, 119 (2), pp.024506. ⟨hal-01481104⟩