Exceedingly high performance top-gate p-type sno thin film transistor with a nanometer scale channel layer

Te Jui Yen, Albert Chin, Vladimir Gritsenko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Implementing high-performance n-and p-type thin-film transistors (TFTs) for monolithic three-dimensional (3D) integrated circuit (IC) and low-DC-power display is crucial. To achieve these goals, a top-gate transistor is preferred to a conventional bottom-gate structure. However, achieving high-performance top-gate p-TFT with good hole field-effect mobility (µFE) and large on-current/off-current (ION /IOFF) is challenging. In this report, coplanar top-gate nanosheet SnO p-TFT with high µFE of 4.4 cm2 /Vs, large ION /IOFF of 1.2 × 105, and sharp transistor’s turn-on subthreshold slopes (SS) of 526 mV/decade were achieved simultaneously. Secondary ion mass spectrometry analysis revealed that the excellent device integrity was strongly related to process temperature, because the HfO2 /SnO interface and related µFE were degraded by Sn and Hf inter-diffusion at an elevated temperature due to weak Sn–O bond enthalpy. Oxygen content during process is also crucial because the hole-conductive p-type SnO channel is oxidized into oxygen-rich n-type SnO2 to demote the device performance. The hole µFE, ION /IOFF, and SS values obtained in this study are the best-reported data to date for top-gate p-TFT device, thus facilitating the development of monolithic 3D ICs on the backend dielectric of IC chips.

Original languageEnglish
Article number92
Pages (from-to)1-11
Number of pages11
Issue number1
Publication statusPublished - Jan 2021


  • 3D brain-mimicking IC
  • Monolithic 3D
  • SnO TFT
  • monolithic 3D


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