[16p-M_B104-1~18] 12.4 Organic light-emitting devices, organic transistors, and flexible devices

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[16p-M_B104-7] Flexible mid-wave infrared imaging using black phosphorus ink films

〇Theodorus Jonathan Wijaya^1,2, Naoki Higashitarumizu², Tomoyuki Yokota¹, Ali Javey², Takao Someya¹ (1.UTokyo, 2.UC Berkeley)

Keywords:

flexible,infrared,imaging

The mid-wave infrared (MWIR) spectral range (λ = 3–8 μm) is central to sensing and imaging technologies such as non-invasive bioimaging, night vision, and autonomous navigation. However, MWIR photodetection remains dominated by rigid imagers based on heteroepitaxial semiconductors, which fundamentally limits mechanical compliance and integration with curved or deformable surfaces. As electronic systems move toward flexible and conformable formats, this rigidity has become a key bottleneck. Van der Waals (vdW) materials, particularly black phosphorus (BP), provide a promising alternative due to their intrinsic MWIR bandgap, room-temperature operation, and solution processability. In this work, we present flexible MWIR imagers composed of photodiodes fabricated on ultrathin plastic substrates using BP ink films. The devices maintain robust responsivity under bending radii down to 2.5 mm and after 5,000 bending cycles. Leveraging this flexibility, we demonstrate full-azimuthal MWIR imaging with accurate detection of directional light sources, establishing a scalable route toward large-area, conformable MWIR imaging systems.