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The free-carrier concentration in Si-doped AlxGa1-xAs has been calculated by grand-canonical-ensemble statistics without any fitting parameters. Our results are quantitatively in agreement with various experimental data in the temperature range 77—300 K, which indicates that the physical picture of the ground state of DX center (DX-) is of an electronic bipolaron due to the interaction between excess electrons and lattice. When exposed to light, one bipolaron can turn into a polaron, meantime release one electron to the conduction band accompanied by lattice relaxations. Our calculations also prove that DX0 is unstable at thermal equilibrium, which further confirms our bipolaron mechanism.
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Keywords:
- DX center /
- bipolarons /
- freezing
[1] Lifshitz N, Jayaraman A, Logan R A , Card H C 1980 Phys. Rev. B 21 670
[2] Yang J J, Moudy L A, Simpson W I 1982 Appl. Phys. Lett. 40 244
[3] Schubert E F, Ploog K 1984 Phys. Rev. B 30 7021
[4] Legros R, Mooney P M, Wright S L 1987 Phys. Rev. B 35 7505
[5] Etienne B, Mieg V T 1988 Appl. Phys. Lett. 52 1237
[6] Lang D V, Logan R A 1977 Phys. Rev. Lett. 39 635
[7] Lang D V, Logan R A 1979 Phys. Rev. B 19 1015
[8] Chadi D J, Chang K J 1988 Phys. Rev. Lett. 61 873
[9] Chadi D J, Chang K J 1989 Phys. Rev. B 39 10063
[10] Li M F, Yu P Y, Weber E R, Hansen W 1987 Phys. Rev. B 36 4531
[11] Li M F, Yu P Y, Weber E R, Hansen W 1987 Appl. Phys. Lett. 51 349
[12] Li M F, Jia Y B, Yu P Y, Zhou J, Gao J L 1989 Phys. Rev. B 40 1430
[13] Ouaja F R, Mejri H, Triki A, Selmi A, Rebey A 2000 J. Appl. Phys. 88 2583
[14] Chand N, Henderson T, Klem J, Masselink W T, Fischer R, Chang Y C, Morkoc H 1984 Phys. Rev. B 30 4481
[15] Baraldi A, Ghezzi C, Parisini A, Bosacchi A, Franchi S 1991 Phys. Rev. B 44 8713
[16] Mostefaoul R, Chevallier J, Jalil A, Pesant J C, Tu C W, Kopf R F 1988 J. Appl. Phys. 64 207
[17] Schubert E F, Ploog K 1984 Phys. Rev. B 30 7021
[18] Wei J H, Xie S J, Mei L M 2000 Acta Phys. Sin. 49 2264 (in Chinese)[魏建华、解士杰、梅良模 2000 49 2264]
[19] Liu D S, Zhao J Q, Wei J H, Xie S J, Mei L M 1999 Acta Phys. Sin. 48 1327 (in Chinese)[刘德胜、赵俊卿、魏建华、解士杰、梅良模 1999 48 1327]
[20] Shi J, Gao K, Lei J, Xie S J 2009 Acta Phys. Sin. 58 459 (in Chinese)[史 晶、高 琨、 雷 杰、解士杰 2009 58 459]
[21] Dobaczewski L, Kaczor P 1991 Phys. Rev. B 44 8621
[22] Xiao X F, Kang J Y 2002 Acta Phys. Sin. 51 138 (in Chinese) [肖细凤、康俊勇 2002 51 138]
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[1] Lifshitz N, Jayaraman A, Logan R A , Card H C 1980 Phys. Rev. B 21 670
[2] Yang J J, Moudy L A, Simpson W I 1982 Appl. Phys. Lett. 40 244
[3] Schubert E F, Ploog K 1984 Phys. Rev. B 30 7021
[4] Legros R, Mooney P M, Wright S L 1987 Phys. Rev. B 35 7505
[5] Etienne B, Mieg V T 1988 Appl. Phys. Lett. 52 1237
[6] Lang D V, Logan R A 1977 Phys. Rev. Lett. 39 635
[7] Lang D V, Logan R A 1979 Phys. Rev. B 19 1015
[8] Chadi D J, Chang K J 1988 Phys. Rev. Lett. 61 873
[9] Chadi D J, Chang K J 1989 Phys. Rev. B 39 10063
[10] Li M F, Yu P Y, Weber E R, Hansen W 1987 Phys. Rev. B 36 4531
[11] Li M F, Yu P Y, Weber E R, Hansen W 1987 Appl. Phys. Lett. 51 349
[12] Li M F, Jia Y B, Yu P Y, Zhou J, Gao J L 1989 Phys. Rev. B 40 1430
[13] Ouaja F R, Mejri H, Triki A, Selmi A, Rebey A 2000 J. Appl. Phys. 88 2583
[14] Chand N, Henderson T, Klem J, Masselink W T, Fischer R, Chang Y C, Morkoc H 1984 Phys. Rev. B 30 4481
[15] Baraldi A, Ghezzi C, Parisini A, Bosacchi A, Franchi S 1991 Phys. Rev. B 44 8713
[16] Mostefaoul R, Chevallier J, Jalil A, Pesant J C, Tu C W, Kopf R F 1988 J. Appl. Phys. 64 207
[17] Schubert E F, Ploog K 1984 Phys. Rev. B 30 7021
[18] Wei J H, Xie S J, Mei L M 2000 Acta Phys. Sin. 49 2264 (in Chinese)[魏建华、解士杰、梅良模 2000 49 2264]
[19] Liu D S, Zhao J Q, Wei J H, Xie S J, Mei L M 1999 Acta Phys. Sin. 48 1327 (in Chinese)[刘德胜、赵俊卿、魏建华、解士杰、梅良模 1999 48 1327]
[20] Shi J, Gao K, Lei J, Xie S J 2009 Acta Phys. Sin. 58 459 (in Chinese)[史 晶、高 琨、 雷 杰、解士杰 2009 58 459]
[21] Dobaczewski L, Kaczor P 1991 Phys. Rev. B 44 8621
[22] Xiao X F, Kang J Y 2002 Acta Phys. Sin. 51 138 (in Chinese) [肖细凤、康俊勇 2002 51 138]
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