由于Si/SiGe异质结构的带阶差主要发生在价带,为实现高效率的发光,本文从理论上设计了在硅基Si1-x Gex虚衬底上外延应变补偿的Si/S1-y Ge,(y>x)量子阱的能带结构,将量子阱对电子的限制势垒提高到100meV以上.在实验上,采用300℃生长的Ge量子点插入层,制备出薄的SiGe驰豫缓冲层(虚衬底),表面Ge组份达到0.25,表面粗糙度小于2nm,驰豫度接近100%.在我们制备的SiGe缓冲层上外延了应变补偿SiGe/Si多量子阱结构,并初步研究了其发光特性.
参考文献
[1] | K. Ismail;M. Arafa;K. L. Saenger;J. O. Chu;B. S. Meyerson .Extremely high electron mobility in Si/SiGe modulation-doped heterostructures[J].Applied physics letters,1995(9):1077-1079. |
[2] | J. Munguia;G. Bremond;O. Marty;J.-M. Bluet;M. Mermoux .Optical characterization of a strained silicon quantum well on SiGe on insulator[J].Applied physics letters,2007(12):122108-1-122108-3-0. |
[3] | N. Sfina;J.-L. Lazzari;F. Ben Zid;A. Bhouri;M. Said .Wave function engineering in W designed strained-compensated Si/Si_(1-x)Ge_x/Si type Ⅱ quantum wells for 1.55μm optical properties[J].Optical materials,2005(5):859-863. |
[4] | Rowell NL.;Lafontaine H.;Williams RL.;Aers GC. .Photoluminescence in UHV-CVD-grown Si1-xGex quantum wells on Si(100): band alignment variation with excitation density and applied uniaxial stress[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,1998(0):158-162. |
[5] | Lianfeng Yang;Jeremy R Watling;Richard C W Wilkins;Mirela Borici;John R Barker;Asen Asenov;Scott Roy .Si/SiGe heterostructure parameters for device simulations[J].Semiconductor Science and Technology,2004(10):1174-1182. |
[6] | P. Boucaud;M. El Kurdi;J. M. Hartmann .Photoluminescence of a tensilely strained silicon quantum well on a relaxed SiGe buffer layer[J].Applied physics letters,2004(1):46-48. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%