4.8 Article

Self-Powered, High-Speed and Visible-Near Infrared Response of MoO3-x/n-Si Heterojunction Photodetector with Enhanced Performance by Interfacial Engineering

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 46, 页码 25981-25990

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09492

关键词

self-powered; high speed; heterojunction; photodetector; interface passivation

资金

  1. National Natural Science Foundation of China [11574119, 21376104]
  2. Fundamental Research Funds for the Central Universities [21615309]
  3. Natural Science Foundation of Guangdong Province [2014A030310302, 2014A030313381]

向作者/读者索取更多资源

Photodetectors with a wide spectrum response are important components for sensing, imaging, and other optoelectronic applications. A molybdenum oxide (MoO3-x)/Si heterojunction has been applied as solar cells with great success, but its potential in photodetectors has not been explored yet. Herein, a self-powered, high-speed heterojunction photodetector fabricated by coating an n-type Si hierarchical structure with an ultrathin hole-selective layer of molybdenum oxide (MoO3-x) is first investigated. Excellent and stable photoresponse performance is obtained by using a methyl group passivated interface. The heterojunction photodetector demonstrated high sensitivity to a wide spectrum from 300 to 1100 nm. The self-powered photodetector shows a high detectivity of (similar to 6.29 x 10(12) cmHz(1/2) W-1) and fast response time (1.0 mu s). The excellent photodetecting performance is attributed to the enhanced interfacial barrier height and three-dimensional geometry of Si nanostructures, which is beneficial for efficient photocarrier collection and transportation. Finally, our devices show excellent long-term stability in air for 6 months with negligible performance degradation. The thermal evaporation method for large-scale fabrication of MoO3-x/n-Si photodetectors makes it suitable for self-powered, multispectral, and high-speed response photodetecting applications.

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