Electrical properties of sulfur-implanted cubic boron nitride thin films

Electrical properties of sulfur-implanted cubic boron nitride thin films
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掺硫立方氮化硼薄膜的电性能

DOI:
10.1007/s11434-014-0136-6
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发表时间:
2014-01
影响因子:
--
通讯作者:
Zhang X. L.
Zhang X. L.
中科院分区:
--
文献类型:
--
作者:
Zhang X. W.;Yin Z. G.;Si F. T.;Gao H. L.;Liu X.;Zhang X. L.

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采用离子束辅助沉积技术在Si衬底上制备了立方氮化硼(c-BN)薄膜,并对其进行了S离子注入掺杂。为了在c-BN膜中产生均匀的S离子深度分布,进行多能量的注入。离子注入引起的c-BN结晶度的轻微下降可以通过热退火恢复,保持立方相含量高达92%。在注入5 × 1014 ions cm-2的S离子并在1,173 K下退火后,c-BN薄膜的电阻从沉积态的1010Ω降低到108Ω,表明S掺杂剂的电掺杂效应。S掺杂的c-BN薄膜的电阻随着温度的升高而降低,表明半导体特性。由电阻随温度的变化关系估算出S掺杂的激活能为0.28 ± 0.01eV。
Cubic boron nitride (c-BN) thin films were deposited on Si substrates by applying ion beam assisted deposition and then doped by S ion implantation. To produce a uniform depth profile of S ions in c-BN films, the implantation was carried out for the multiple energies. A slight degradation of c-BN crystallinity resulted from ion implantation can be recovered by thermal annealing, keeping the cubic phase content as high as 92 %. The resistance reduces from 1010Ω for the as-deposited c-BN film to 108Ω after an S implantation of 5 × 1014ions cm−2and annealing at 1,173 K, suggesting an electrical doping effect of S dopant. The electrical resistance of the S-doped c-BN thin film decreases with increasing temperature, indicating semiconductor characteristics. The activation energy of S dopant is estimated to be 0.28 ± 0.01 eV from the temperature dependence of resistance.
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