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In Situ Au Nanoparticle Decorated Multilayer PdSe2 Films for Enhanced Bolometric Photodetection
Haodong Fan1,2, Shuren Zhou1,2, Rui Zhang3
1State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
ACS Applied Materials & Interfaces
|April 24, 2026
Summary
This study enhances two-dimensional Palladium Diselenide (PdSe2) for uncooled infrared detectors by using gold nanoparticles. This improves thermal imaging performance and enables practical, low-cost applications.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Two-dimensional Palladium Diselenide (PdSe2) shows promise for uncooled infrared detectors due to its tunable bandgap and CMOS compatibility.
- Challenges include compromised temperature coefficient of resistance (TCR) in ultrathin films and performance degradation with increasing thickness.
Purpose of the Study:
- To overcome the limitations of PdSe2 for infrared detection by developing an in situ gold nanoparticle decoration strategy.
- To enhance the thermoelectric response and optical absorption of ultrathin PdSe2 films for improved bolometric performance.
Main Methods:
- Synthesis of ultrathin PdSe2 films (<15 nm) with controlled gold (Au) concentrations on silicon substrates using magnetron cosputtering and low-temperature selenization.
- Systematic characterization of material properties, including optical absorption, thermoelectric response (TCR), and resistivity.
- Fabrication and testing of an 8x8-pixel long-wave infrared focal plane array.
Main Results:
- Optimal Au incorporation (11%) significantly boosted TCR by 53% to -2.28%/K and improved optical absorption by 9.61% in the 9-13 μm range.
- Achieved high thermal resolution (11.8 mK) and, at 34% Au, a responsivity of 2.9 A/W and specific detectivity of 5.1 × 10^8 Jones.
- Demonstrated high-fidelity, uncooled thermal imaging with excellent device uniformity and stability using the fabricated focal plane array.
Conclusions:
- In situ Au nanoparticle decoration is a scalable strategy to enhance the performance of ultrathin PdSe2 for uncooled infrared detectors.
- Gold nanoparticles synergistically improve TCR via grain boundary engineering and Coulomb screening effects.
- This approach paves the way for high-performance, low-cost 2D-material-based infrared detectors for next-generation thermal imaging.
