Enhanced Ultraviolet Photodetection via Ultraporous ZnO/PEDOT:PSS Hybrid Architectures

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Abstract
Ultraviolet photodetectors are essential for applications ranging from environmental sensing to optoelectronics. ZnO is a widely studied UV-sensitive material due to its wide bandgap and structural tunability; however, devices based on pristine ZnO nanostructures often face challenges such as inefficient electron-hole separation, resulting in reduced photocurrent and consequently suppressed photoresponsvity. To address these limitations, we report the fabrication of ultraporous ZnO/PEDOT:PSS hybrid photodetectors that deliver enhanced photoresponsivity and improved stability. The hybrid architecture integrates a high-surface-area ZnO framework with a tailored PEDOT:PSS interface, forming localized p-n heterojunction domains that promote efficient carrier separation and suppress recombination. The optimized device (Z/P0.025%) achieved a responsivity of ∼4.1 A·W-1 at 340 nm and a phototo-dark current ratio of ≈7 × 102. This work highlights the potential of hybrid heterojunction architectures and interface engineering in advancing the performance and scalability of next-generation UV photodetectors.
Funding Information
  • Cancer Institute NSW (2022/ECF1417)
  • Macquarie University

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