Photothermal Engineering in Ta <sub>2</sub> O <sub>5</sub> Memristors: Blue-Laser-Driven Filament Reorientation for On/Off Ratio Enhancement
This work demonstrates the first instance of wavelength-selective resistive switching (RS) activation in Ag/Ta<sub>2</sub>O<sub>5</sub>/ITO memristors via photothermal engineering, revealing that photon-matter interactions govern conductive filament (CF) dynamics, a critical insight for advancing memristor-based neuromorphic computing architectures. The photothermal effects of 405, 532, and 790 nm laser irradiation are conducted through current-voltage (<i>I</i>-<i>V</i>) characterization, 100-cycle on/off ratio evaluation, and retention time analysis. Remarkably, the device subjected to 405 nm laser irradiation (300 s, 1.2 mW) exhibits an unprecedented on/off ratio of 93, a retention time above 10<sup>4</sup> s, and a maximum current of 2 mA, representing nearly a 10-fold RS enhancement compared to the pristine device. Finite element thermal simulations and laser power-dependent RS analysis elucidate that the laser-induced CF formation arises from localized photothermal heating, enabling precise control over device performance.
Authors
- Yingtao Chen (ORCID: https://orcid.org/0009-0005-8402-9154)
- Yijun Lü (ORCID: https://orcid.org/0000-0002-1247-6597)
- Weijie Guo (ORCID: https://orcid.org/0000-0001-9635-3342)
- Zhong Chen (ORCID: https://orcid.org/0000-0002-1473-2224)
- Han Gao (ORCID: https://orcid.org/0009-0005-8528-6929)
- Wenjie He (ORCID: https://orcid.org/0009-0000-3597-9333)
- Ju‐Hsiou Liao (ORCID: https://orcid.org/0009-0003-6901-8882)
Institutions
- Xiamen University (CN)
- National Institute for Fusion Science (JP)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-10-27
- DOI
- https://doi.org/10.1021/acsami.5c12170
- Citations
- 1
- Primary Topic
- Advanced Memory and Neural Computing
- Type
- article
- Field-Weighted Citation Impact
- 0.73