物理学报2011，Vol.60Issue(1)：539-542,4.
退火对非故意掺杂4H-SiC外延材料386nm和388nm发射峰的影响
Effect of annealing treatment on the 386 nm and 388 nm emission peaks in unintentionally doped 4H-SiC epilayer
摘要
Abstract
Under different annealing treatment conditions, the low temperature PL properties of unintentionally doped 4H-SiC epilayer have been studied by photoluminescence (PL) technique at 10 K. The results show that there are three emission peaks in the range from 370 nm to 400 nm and the maximum energy is about 3.26 eV, which is in accordance with the energy gaps (Eg) of 4H-SiC at room temperature. The 386 nm and 388 nm peaks (corresponding to ～ 3.21 eV and ～ 3.19 eV, respectively) are related with N impurity. When keeping annealing time at 30 min, the PL intensity of 386 nm and 388 nm peaks increases and then decreases with the annealing temperature increasing and reaches a maximum at 1573 K. The PL at 386 nm and 388nm change in quite the same manner with annealing time during isothermal annealing at temperature of 1573 K, whereas the difference is small. With the same annealing treatment, the low temperature PL results of 386 nm and 388 nm coincide with that of intrinsic defects in unintentionally doped 4H-SiC, which results from the interaction of infinitesimal disturbance potential energy between N impurity and native defects.关键词
光致发光/退火处理/能级/4H-SiCKey words
photoluminescence/ annealing treatment/ energy level/ 4H-SiC引用本文复制引用
程萍,张玉明,张义门..退火对非故意掺杂4H-SiC外延材料386nm和388nm发射峰的影响[J].物理学报,2011,60(1):539-542,4.基金项目
国家自然科学基金(批准号:60876061),预研基金(批准号:9140A08050508)和陕西省13115创新工程(批准号:2008ZDKG-30)资助的课题. （批准号:60876061）
