摘要
采用热丝辅助化学气相沉积(HFCVD)方法生长得到25μm厚的[100]取向金刚石膜,用以制备辐射探测器。在100 V偏压下,测得暗电流为16.1 nA,55Fe X射线(5.9 keV)和241Amα粒子(5.5 M eV)辐照下的净光电流分别为15.9nA和7.0nA。光电流随时间的变化先快速增加随后由于“pump ing”效应逐渐达到稳定。X射线和α粒子辐照下的平均电荷收集效率分别为45%和19%,并由Hecht理论计算得到对应的电荷收集距离为11.25μm和4.75μm。
A radiation detector was fabricated by [ 100 ] -oriented diamond film which was deposited by hot filament chemical vapor deposition （HFCVD） method. The thickness of the film was 25μm. Under a bias voltage of 100V, the dark current was 16. lnA . The net photocurrent was also obtained as 15.9 nA and 7.0 nA under the irradiation of ^55 Fe （ 5. 9 keV ） X-ray and ^241 Am （ 5. 5 MeV ） α particles, respectively. The photocurrent increased rapidly at first and reached stably for the ＂pumping＂ effect with the time elapsing. The charge collection efficiency was 45% （X-rays） and 19% （α particles）, corresponding to the charge collection distance of 11.25 μm and 4.75 μm by calculating according to Hecht theory.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2006年第4期719-723,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(No.60577040)
上海应用材料研究与发展基金(0404)
上海市纳米专项(0452nm051
05nm05046)
上海市重点学科(T0101)资助
关键词
金刚石膜
辐射探测器
光电流
电荷收集效率
diamond film
radiation detector
photocurrent
charge collection efficiency
