Deposition of high-quality Ge film on Si by PECVD using GeCl4/H2 for fabricating near-infrared photodiodes

Jyun You Lai, Shang Che Tsai, Ming Wei Lin, Szu yuan Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Direct deposition of high-quality Ge film on Si substrate suitable for fabricating Ge/Si photodiodes was achieved by using plasma-enhanced chemical vapor deposition (PECVD) with GeCl4/H2 as precursors. A tensile-strained, impurity-free, monocrystalline Ge film with a surface roughness of < 1 nm and a threading-dislocation density on the order of 104 cm−2 could be grown at a rate of ca. 80 nm/min at a substrate temperature of 450 °C directly without the need of any kind of buffer layer or post-annealing. When applied to fabricate near-infrared (NIR) photodiodes, a low dark current density and a reasonably good responsivity for the employed photodiode architecture were attained, revealing the potential of this low-temperature fabrication method in monolithic integration of optoelectronic components with Si-based electronic circuits. The success of this technique may be attributed to an atomic-layer-deposition-like process for both nucleation and growth.

Original languageEnglish
Article number106740
JournalMaterials Science in Semiconductor Processing
Volume148
DOIs
StatePublished - Sep 2022

Keywords

  • Ge/Si
  • Germanium tetrachloride
  • Photodiode
  • Plasma-enhanced chemical vapor deposition

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