Diffusion of As, P, and B from Doped Polysilicon through Thin S1O2 Films into Si Substrates

Junichi Murota, Nobuo Mikoshiba, Izumi Kawashima, Takashi Sawai

研究成果: Article査読

27 被引用数 (Scopus)


Diffusion characteristics of As, P, and B in SiO2 films as thin as 35 A have been studied using doped polysilicon/ Si02/Si structure samples. A two-boundary model can well characterize the As and P diffusion and low concentration B diffusion, where the derived diffusion coefficients and segregation coefficients are given by DSiO2 as (cm2 s-l) = 2.3 x 103 exp (-5.3 eV/kT), mAs = 1.8 x 107 exp (-1.3 eV/fcT), Dsio2-p (cm2 s_1) = 1.2 x 102 exp (-4.1 eV/kT), mP = 9.2 x 105 exp (-1.0 eV/kT), DSio2-B (cm2s-1) = 0.31 exp (-4.2 eV/kT), mB = 30 exp (-0.33 eV/kT). For diffusion of high B concentrations, anomalous enhancement of diffusion has been observed at long diffusion times t, and thin Si02 film thickness. Based on the change of bond characteristics in Si02 observed by SIMS and ESCA, the enhancement has been explained by assuming that the changed layer with a high diffusion coefficient grows in Si02 with a thickness dF = V/ct, where the rate constant k is given typically by fc(cm2 s’1) = 2.5 x 107 exp (—6.4 eV/kT) for a B concentration in polysilicon Cpoly = 2.5 X 1020cm-3.

ジャーナルJournal of the Electrochemical Society
出版ステータスPublished - 1991

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学


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