Wafer‐Scale InN/In2S3 Core–Shell Nanorod Array for Ultrafast Self‐Powered Photodetection

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Abstract
Self‐powered photodetectors have paved the way for electronic applications in fields such as civilian communication, infrared mapping, and industrial automatic control. However, most self‐powered photodetectors have faced photoresponse‐speed and device‐scale bottlenecks. Herein, a novel, self‐powered detector with an ultrafast response speed based on a core–shell InN/In2S3 nanorod array is proposed. A wafer‐scale InN/In2S3 nanorod array with good homogeneity is synthesized on Si substrates via a simple two‐step method involving molecular beam epitaxy and chemical vapor deposition. The photodetector device exhibits excellent self‐powered properties and a high current on/off ratio of 5 × 103. Further analyses determined that the device have an excellent photovoltaic responsivity and detectivity of 140 mA·W−1 and 4.0 × 1010 Jones, respectively (0 V). Impressively, the device exhibits an ultrafast photoresponse with a rise/fall time of 22/32 µs. The self‐powered InN/In2S3 photodetector with an ultrafast response speed shows superior potential for electronic applications. The core–shell nanostructure hybrid heterojunction introduces a novel idea for wafer‐scale nano‐photodetectors.
Funding Information
  • National Natural Science Foundation of China (52172141, 51727901)

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