Journal of Semiconductors, Volume. 45, Issue 10, 102302(2024)

Structure and electrical properties of polysilicon films doped with ammonium tetraborate tetrahydrate

Yehua Tang1, Yuchao Wang2,3, Chunlan Zhou3,4、*, and Ke-Fan Wang5、**
Author Affiliations
  • 1Electrical and Energy Engineering Department, Nantong Institute of Technology, Nantong 226000, China
  • 2Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology, School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China
  • 3Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100049, China
  • 4School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
  • 5Henan Key Laboratory of Quantum Materials and Quantum Energy, School of Future Technology, Henan University, Kaifeng 475004, China
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    Figures & Tables(8)
    (Color online) Flow chart of the experimental process.
    (Color online) Raman spectra and the corresponding deconvolution peaks of 150 nm silicon film (a) deposited by magnetic sputtering (p:a-Si), (b) annealed directly at 950 °C for 45 min (pPoly film), and (c) annealed with spin-coated ATT at 950 °C for 45 min (ATT-pPoly film). (d) XRD patterns of the three samples.
    (Color online) Effect of ATT on the average grain size (δ). (a) Particle size obtained through log-normal and Gaussian distributions. Inset: a typical SEM image of the annealed polysilicon film; (b) the average grain size δ of pPoly and ATT-pPoly films annealed at 950 °C for 45 min under different sputtering thickness (d).
    (Color online) Electrical properties of the p:poly-Si films vs. deposition thickness (d). (a) Resistivity (ρ), (b) carrier concentration (p*), and (c) carrier mobility (μ).
    (Color online) Mean sheet resistance (Rsheet,m) and the corresponding standard deviation coefficient (σ) vs. annealing temperature of the samples annealed for 45 min. The silicon films shown in (a) are deposited at a pressure of 0.2 Pa, and the samples in (b) are deposited at 0.5 Pa. The curves in (c) and (d) show uniformity.
    (Color online) Mean sheet resistance (Rsheet,m) and the corresponding standard deviation coefficient (σ) vs. annealing duration at 900 °C. The silicon films shown in (a) are deposited at a pressure of 0.2 Pa and the sample in (b) is deposited at 0.5 Pa. The curves in (c) and (d) show uniformity.
    (Color online) Boron concentration distribution in p:poly-Si films (annealed at 950 °C for 45 min) measured by SIMS.
    • Table 1. Comparison between the electrical properties of proposed and previously reported boron-doped p:poly-Si films.

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      Table 1. Comparison between the electrical properties of proposed and previously reported boron-doped p:poly-Si films.

      FilmDopantCarrierRef.
      Deposition methodThicknessd (nm)SourceProgressConcentrationp* (cm−3)Mobilityμ (cm2/(V·s))
      a S-MIC: solution-based metal-induced crystallization; b MILE: metal-induced layer exchange.
      LPCVD + laser crystallizing150BF2, implantationRTA: 950 °C4.30 × 101922.94[43]
      CO2 laser annealing: 135 W1.92 × 101918.06[43]
      LPCVD + annealing (550/590) S-MICa100B, implantationAnnealing: 900 °C~3 × 1019~32[44]
      LPCVD + annealing (1000 °C)550B, implantationAnnealing: 1000 °C1.7 × 1019~22.5[45]
      Electron beam evaporation + MILEb170Thermal effusion cells (B: HTS-W): 1950 °CAnnealing: 800 °C, 100 mbar3.2 × 101911.2[46]
      APCVD~5000BBr3: in-situ880 °C3.9 × 1019~14.8[47]
      APCVD~4100BBr3: in-situ880 °C3.4 × 1019~15[48]
      PECVD + laser crystallizing50B2H6: implantationForming gas: 650 °C~7 × 1019~10[49]
      Sputter150ATTAnnealing: 950 °C1.73 × 102032.5This work
      804.24 × 102031.9
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    Yehua Tang, Yuchao Wang, Chunlan Zhou, Ke-Fan Wang. Structure and electrical properties of polysilicon films doped with ammonium tetraborate tetrahydrate[J]. Journal of Semiconductors, 2024, 45(10): 102302

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    Paper Information

    Category: Research Articles

    Received: Mar. 23, 2024

    Accepted: --

    Published Online: Dec. 5, 2024

    The Author Email: Zhou Chunlan (CLZhou), Wang Ke-Fan (KFWang)

    DOI:10.1088/1674-4926/24030032

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