All-optical 2D perovskite photodetector arrays for pixelated long-wave infrared imaging

Abstract

Infrared detection and imaging are important for applications including thermal monitoring, night vision, environmental sensing, and molecular identification. All-optical mid-wave infrared (MWIR) and long-wave infrared (LWIR) detection offers a compelling alternative to conventional infrared detectors by enabling non-contact photothermal sensing without needing electronic readout circuitry. Here, we demonstrate pixelated LWIR imaging using solution-processed two-dimensional metal-halide perovskites (2D-MHPs), whose strong electron-phonon interaction produces a large temperature coefficient of reflectance in the visible wavelength range. By integrating (PEA) ₂ PbI ₄ films with LWIR-absorbing SiNₓ membranes, we realize centimeter-scale imagers capable of detecting 9.5-µm LWIR light with sensitivity down to ~20 pW·µm⁻². To mitigate lateral thermal diffusion that limits spatial fidelity, we introduce a structured-probe illumination scheme, and we further develop a fully pixelated imager with thermally isolated membrane-disc arrays. This design effectively eliminates pixel-to-pixel crosstalk and enables high-resolution optical readout using a silicon-based CMOS camera. These advances establish 2D-MHP-based all-optical thermal imaging as a scalable, low-cost platform for LWIR sensing, with strong potential for extension to far-infrared and terahertz detection.

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Cite

BibTeX RIS

BibTeX

@article{li2026alloptical,
  title = {{All-optical 2D perovskite photodetector arrays for pixelated long-wave infrared imaging}},
  author = {Yanyan Li and Zheng Qian and Du Chen and Conrad A. Kocoj and Shunran Li and Renee Wu and Xiang Shi and Ralu Divan and David A. Czaplewski and Benjamin T. Diroll and Ming Lu and Yugang Zhang and Shu Hu and Peijun Guo},
  journal = {Light: Science \& Applications},
  year = {2026},
  month = nov,
  doi = {10.1038/s41377-026-02442-y},
  url = {https://www.nature.com/articles/s41377-026-02442-y},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - All-optical 2D perovskite photodetector arrays for pixelated long-wave infrared imaging
AU  - Yanyan Li
AU  - Zheng Qian
AU  - Du Chen
AU  - Conrad A. Kocoj
AU  - Shunran Li
AU  - Renee Wu
AU  - Xiang Shi
AU  - Ralu Divan
AU  - David A. Czaplewski
AU  - Benjamin T. Diroll
AU  - Ming Lu
AU  - Yugang Zhang
AU  - Shu Hu
AU  - Peijun Guo
PY  - 2026
DA  - 2026/11/02
JO  - Light: Science & Applications
DO  - 10.1038/s41377-026-02442-y
UR  - https://www.nature.com/articles/s41377-026-02442-y
AB  - Infrared detection and imaging are important for applications including thermal monitoring, night vision, environmental sensing, and molecular identification. All-optical mid-wave infrared (MWIR) and long-wave infrared (LWIR) detection offers a compelling alternative to conventional infrared detectors by enabling non-contact photothermal sensing without needing electronic readout circuitry. Here, we demonstrate pixelated LWIR imaging using solution-processed two-dimensional metal-halide perovskites (2D-MHPs), whose strong electron-phonon interaction produces a large temperature coefficient of reflectance in the visible wavelength range. By integrating (PEA) ₂ PbI ₄ films with LWIR-absorbing SiNₓ membranes, we realize centimeter-scale imagers capable of detecting 9.5-µm LWIR light with sensitivity down to ~20 pW·µm⁻². To mitigate lateral thermal diffusion that limits spatial fidelity, we introduce a structured-probe illumination scheme, and we further develop a fully pixelated imager with thermally isolated membrane-disc arrays. This design effectively eliminates pixel-to-pixel crosstalk and enables high-resolution optical readout using a silicon-based CMOS camera. These advances establish 2D-MHP-based all-optical thermal imaging as a scalable, low-cost platform for LWIR sensing, with strong potential for extension to far-infrared and terahertz detection.
SN  - 2047-7538
SN  - 2095-5545
ER  -

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