%0 Journal Article
%T The influence of grain boundary on time response of diamond ultraviolet photo-detector<br>晶界对金刚石紫外探测器时间响应性能的影响
%A Wang Lan-Xi
%A Chen Xue-Kang
%A Wu Gan
%A Cao Sheng-Zhu
%A Shang Kai-Wen
%A <br>王兰喜
%A 陈学康
%A 吴敢
%A 曹生珠
%A 尚凯文
%J 物理学报
%D 2012
%I 
%X Persistent photoconductivity(PPC) is a deterring factor for the time response of ultraviolet photo-detectors made of polycrystalline diamond films.The existence of PPC can greatly prolong the response time of photo-detectors.In this paper,ultraviolet photo-detectors with interdigital electrode spacings of 20μm and 30μm(denoted as "device A" and "device B",respectively) are fabricated on microcrystalline diamond films,and the influences of grain boundary on time response of diamond ultraviolet photo-detectors are discussed.Results show that performances of PPC and photoconductive gain are present in the two photo-detectors,and the PPC is longer and the photoconductive gain is higher in device B than in device A.It is suggested that grain boundaries may induce a shallow level in the bandgap and act as minority carrier trapping centers,leading to PPC and high gain.There are more grain boundaries between the electrodes in device B than in device A,which hence explains the higher photoconductive gain and responsivity as well as more significant PPC in device B than in device A.
%K diamond ultraviolet photo-detector
%K grain boundary
%K persistent photoconductivity
%K photoconductive gain<br>金刚石紫外探测器
%K 晶界缺陷
%K 持续光电导
%K 光电导增益
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=EA4AE3EE8E5D685E340A715178CD4806&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=38B194292C032A66&sid=A935C0B56825365D&eid=A935C0B56825365D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=21