Uncooled Mid-Infrared Sensing Enabled by Chip-Integrated Low-Temperature-Grown 2D PdTe 2 Dirac Semimetal

Next-generation mid-infrared (MIR) imaging chips demand free-cooling capability and high-level integration. The rising two-dimensional (2D) semimetals with excellent infrared (IR) photoresponses are compliant with these requirements. However, challenges remain in scalable growth and substrate-dependence for on-chip integration. Here, we demonstrate the inch-level 2D palladium ditelluride (PdTe2) Dirac semimetal using a low-temperature self-stitched epitaxy (SSE) approach. The low formation energy between two precursors facilitates low-temperature multiple-point nucleation (∼300 °C), growing up, and merging, resulting in self-stitching of PdTe2 domains into a continuous film, which is highly compatible with…

• NN
  National Natural Science Foundation of China

  Awards: U2004165, 51973147, U22A20138, 52225303, 52173178, 51821002
• HK
  Hong Kong Polytechnic University

  Award: 1-CD6F
• FP
  Fundo para o Desenvolvimento das Ciências e da Tecnologia

  Award: 0145/2022/A3
• IA
  Innovation and Technology Fund

  Award: GHP/040/19SZ
• CI
  Collaborative Innovation Center of Suzhou Nano Science and Technology