Frontiers in Physics (Sep 2022)

Electronic global-shutter one-thin-film-transistor active pixel sensor array with a pixel pitch of 50 μm and photoconductive gain greater than 100 for large-area dynamic imaging

  • Yunfeng Hu,
  • Yangbing Xu,
  • Jinming Liu,
  • Yihong Qi,
  • Kai Wang

DOI
https://doi.org/10.3389/fphy.2022.1000909
Journal volume & issue
Vol. 10

Abstract

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In large-area dynamic imaging, an active pixel sensor (APS) is proposed. However, there is a trade-off between signal-to-noise ratio (SNR) and spatial resolution. To resolve this, a 256 × 256 active pixel image sensor array based on a 3-D dual-gate photosensitive thin-film transistor (TFT) is presented in this work, with a pixel pitch of 50 μm, pixel fill factor of 63%, photoconductive gain of 102–104 and spatial resolution of 505 ppi. An electronic global shutter is enabled by dual-gate biasing without additional a shutter TFT. Such an array is capable of dynamic imaging at a frame rate of 34 Hz.

Keywords