High Dynamic Range 120 dB Ga₂O₃-In₂Se₃ Photodetector Array by Ferroelectric Polarization Enhancement

Gallium oxide-based photodetectors have specialized applications in both civilian and military fields due to their excellent spectral selectivity for solar-blind ultraviolet (SBUV) light. However, gallium oxide photodetectors still face challenges in weak-light detection capability, which hinders their further commercialization. Here, we devised a Ga₂O₃-In₂Se₃ single-crystal van der Waals heterojunction photodetector by using the polarization modulation effect of ferroelectric semiconductors. Under illumination with a 255 nm light, the Ga₂O₃-In₂Se₃ photodetector achieves an on/off ratio of 712,434 and a detectivity of 1.6 × 10¹⁴ Jones, with a linear dynamic range (LDR) of 120 dB. Furthermore, we fabricated a 5×5 array and all photodetectors exhibit consistent optoelectronic performance, indicating the imaging application potential of the array. This work provides novel insights for ferroelectric-enhanced solar-blind ultraviolet detectors.