Mid-wave and long-wave infrared (MWIR and LWIR) detection play vital roles in applications that include health care, remote sensing, and thermal imaging. However, detectors in this spectral range often require complex fabrication processes and/or cryogenic cooling and are typically expensive, which motivates the development of simple alternatives. Here, we demonstrate broadband (0.43-10 μm) room-temperature photodetection based on copper tetracyanoquinodimethane (CuTCNQ), a metal-organic semiconductor, synthesized via a facile wet-chemical reaction. The CuTCNQ crystals are simply drop-cast onto interdigitated electrode chips to realize photoconductors. The photoresponse is governed by a combination of interband (0.43-3.35 μm) and midgap (3.35-10 μm) transitions. The devices show response times (∼365 μs) that would be sufficient for many infrared applications (e.g., video rate imaging), with a frequency cutoff point of 1 kHz.
Bibliographical noteFunding Information:
This work was supported by DARPA (HR0011-16-1-004) and by the Australian Research Council (DP210103428, DP170103477, DP180104141, FT140100577, DE150100909). This work was performed in part at the Micro Nano Research Facility (MNRF) at RMIT University in the Victorian Node of the Australian National Fabrication Facility (ANFF). Facilities and technical support from the RMIT Microscopy and Microanalysis Facility (RMMF), a node of Microscopy Australia, are acknowledged. This work was supported in part by the Australian Research Council (ARC) Centre of Excellence for Transformative Meta-Optical Systems (Project ID CE200100010).
© 2021 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)