Influence of optical-phonon scattering on electron mobility in wurtzite AlGaN/AlN/GaN heterostructures

Yang Fu-Jun; Ban Shi-Liang

doi:10.7498/aps.61.087201

Abstract

Adopting a numerical method of solving self-consistently the Schrdinger equation and Poisson equation through taking into account the realistic heterostructure potential, which includes the influences of energy band bending and the finite thickness of barriers, and through considering the built-in electric field induced by spontaneous and piezoelectric polarization, the eigenstates and eigenenergies of electrons in two-dimensional electron gas (2DEG) are obtained for wurtzite AlxGa1-xN/AlN/GaN heterostructures with an inserted AlN layer. Based on the continuous dielectric model and the Loudon's uniaxial crystal model, optical-phonon modes and their ternary mixed crystals effect are discussed using the transfer matrix method. Furthermore, the Lei-Ting balance equation is extended in order to investigate the distribution of 2DEG and its size effect as well as ternary mixed crystals effect on electron mobility, which under the influence of each branch of optical-phonon modes are analyzed at room temperature. The results show that the increases of the thickness of inserted AlN layer and the Al component of AlxGa1-xN in the barrier enhance the built-in electric field in the GaN layer, leading 2DEG to be much closer to the interface of a heterostructure. In addition, it can also be found that the scattering from the interface phonons is stronger than from other optical-phonons, the interface phonons play a dominant role in the total mobility. A higher electron mobility can be obtained by adjusting appropriately the thickness of inserted AlN layer and Al component.

Keywords:

Authors and contacts

1.
School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China
Funds: Project supported by the National Natural Science Foundation of China (Grant No. 60966001), the Key Program of Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant No. 20080404Zd02), and the Specialized Research Foundation for the Doctoral Program of Higher Education of China (Grant No. 20070126001).

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[62]	Lepkowski S P, Teisseyre H, Suski T, Perlin P, Grandjean N, Massies J 2001 Appl. Phys. Lett. 79 1483
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Cited By

[1]
[2]	Gaska R, Shur M S, Bykhovski A D, Orlov A O, Snider G L 1999 Appl. Phys. Lett. 74 287
[3]	Smorchkova I P, Elsass C R, Ibbetson J P, Vetury R, Heying B, Fini P, Haus E, DenBaars S P, Speck J S, Mishra U K 1999 J. Appl. Phys. 86 4520
[4]
[5]
[6]	Tao Y Q, Chen D J, Kong Y C, Shen B, Xie Z L, Han P, Zhang R, Zheng Y D 2006 J. Electron. Mater. 35 722
[7]
[8]	Hsu L, Walukiewicz W 1997 Phys. Rev. B 56 1520
[9]	Gaska R, Yang J W, Osingsky A, Chen Q, Khan M A, Orlov A O, Snider G L, Shur M S 1998 Appl. Phys. Lett. 72 707
[10]
[11]	Gurusinghe M N, Davidsson S K, Andersson T G 2005 Phys. Rev. B 72 045316
[12]
[13]
[14]	Shen L, Heikman S, Moran B, Coffie, Zhang N D, Buttari D, Smorchkova I P, Keller S, DenBaars S P, Mishra U K 2001 IEEE Electron Dev. Lett. 22 457
[15]	Hsu L, Walukiewicz W 2001 J. Appl. Phys. 89 1783
[16]
[17]	Smorchkova I P, Chen L, Mates T, Shen L, Heikman S, Moran B, Keller S, DenBaars S P, Speck J S, Mishra U K 2001 J. Appl. Phys. 90 5196
[18]
[19]
[20]	Miyoshi M, Ishikawa H, Egawa T, Asai K, Mouri M, Shibata T, Tanaka M, Oda O 2004 Appl. Phys. Lett. 85 1710
[21]	Tlek R, Ilgaz A, Gkden S, Teke A, ztrk M K, Kasap M, z\c{celik S, Arslan E, zbay E 2009 J. Appl. Phys. 105 013707
[22]
[23]	Miyoshi M, Egawa T, Ishikkawa H 2005 J. Appl. Phys. 98 63713
[24]
[25]	Lee B C, Kim K W, Stroscio M A, Dutta M 1998 Phys. Rev. B 58 4860
[26]
[27]	Komirenko S M, Kim K W, Stroscio M A, Dutta M 2000 Phys. Rev. B 61 2034
[28]
[29]
[30]	Qu Y, Ban S L 2009 Eur. Phys. J. B 69 321
[31]	Qu Y, Ban S L 2010 Acta Phys. Sin. 59 4863 (in Chinese) [屈媛, 班士良 2010 59 4863]
[32]
[33]	Qu Y, Ban S L 2011 J. Appl. Phys. 110 013722
[34]
[35]	Chu R M, Zhou Y G, Zheng Y D, Han P, Shen B, Gu S L 2001 Appl. Phys. Lett. 79 2270
[36]
[37]
[38]	Li J M, L Y W, Li D B, Han X X, Zhu Q S, Liu X L, Wang Z G 2004 J. Vac. Sci. Technol. B 22 2568
[39]	L J T, Cao J C 2005 J. Appl. Phys. 97 033502
[40]
[41]	Hayers W, Loudon R 1964 Scattering of Light by Crystals (New York: Wiley) p169
[42]
[43]
[44]	Yu S G, Kim K W, Bergman L, Dutta M, Stroscio M A, Zavada J M 1998 Phys. Rev. B 58 15283
[45]	Holtz M, Prokofyeva T, Seon M, Copeland K, Vanbuskirk J, Williams S, Nikishin S A, Tretyakov V, Temkin H 2001 J. Appl. Phys. 89 7977
[46]
[47]
[48]	Wang X F, da Cunha Lima I C, Lei X L 1998 Phys. Rev. B 58 12609
[49]	Bungaro C, Rapcewicz K, Bernholc J 2000 Phys. Rev. B 61 6720
[50]
[51]	Demangeot F, Groenen J, Frandon J, Renucci M A, Briot O, Clur S, Aulombard R L 1998 Appl. Phys. Lett. 72 2674
[52]
[53]
[54]	Wu J 2009 J. Appl. Phys. 106 011101
[55]
[56]	Zoroddu A, Bernardini F, Ruggerone P, Fiorentini V 2001 Phys. Rev. B 64 045208
[57]	Vurgaftman I, Meyer J R 2003 J. Appl. Phys. 94 3675
[58]
[59]
[60]	Yu S G, Kim K W, Stroscio M A, Iafrate G J, Sun J P, Hsddad G I 1997 J. Appl. Phys. 82 3363
[61]
[62]	Lepkowski S P, Teisseyre H, Suski T, Perlin P, Grandjean N, Massies J 2001 Appl. Phys. Lett. 79 1483
[63]	Wagner J M, Bechstedt F 2002 Phys. Rev. B 66 115202

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Vol. 61, Issue 8 - 2012-04-20

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