P-type β-Ga2O3 metal-semiconductor-metal solar-blind photodetectors with extremely high responsivity and gain-bandwidth product

Z.X. Jiang, Z.Y. Wu, C.C. Ma, J.N. Deng, H. Zhang, Y. Xu, J.D. Ye, Z.L. Fang, G.Q Zhang, J.Y. Kang, T.Y. Zhang

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

P-type β-Ga2O3 films deep-ultraviolet (DUV) solar-blind metal-semiconductor-metal (MSM) photodetectors (PDs) are fabricated with extremely high photoresponsivity (9.5 × 103 A/W), external quantum efficiency (4.7 × 106%), detectivity (1.5 × 1015 Jones), and gain-bandwidth product (106) at 5 V bias, very low noise equivalent power (4.9 × 10−16 W/Hz1/2) and high specific detectivity (1.9 × 1013 Jones) at 1 kHz and 3 V bias. The excellent performances of the p-type β-Ga2O3 DUV MSM PDs are attributed to the charge carrier multiplication via collective excitation of aggregated excitons and/or electron-hole liquid within the fabricated high-quality p-type β-Ga2O3 films, which possess the room-temperature Hall resistivity of 52.6 Ωcm, the hole mobility of 41.4 cm2/V⋅s, and the hole concentration of 2.86 × 1015 cm−3. The unprecedentedly high photoresponsivity and detectivity and the carrier multiplication mechanism in high-quality p-type β-Ga2O3 films pave a novel way to fabricate super sensitive DUV PDs based on p-type wide-bandgap oxide semiconductors.
Original languageEnglish
Article number100226
Pages (from-to)1-9
Number of pages9
JournalMaterials Today Physics
Volume14
DOIs
Publication statusPublished - 2020

Keywords

  • Exciton
  • Noise and gain-bandwidth product
  • P-type electrical properties
  • Photoresponsivity and detectivity
  • Solar-blind photodetector

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