Binding energies of excitons in symmetrical Cd1-xMnxTe/CdTe parabolic quantum well

Abstract

Abstract:

Exciton binding energies in Cd1-xMnxTe/CdTe parabolic quantum well (PQW) with different Mn contents are calculated through variational method in the effective mass approximation. The variations of exciton binding energy as a function of well width, barrier width and electric field are calculated with different Mn compostions. The results show that the exciton binding energy is a non-monotonic function of well width. It increases first until reaching a maximum, and then decreases as the well width increases farther. In addition, with the increase of Mn content the well width should decrease to reach the maximun value of the exciton binding energy. The exciton binding energy increases first until reach a stable value with the increase of barrier width. The results show that the external electric field has little effect on binding energy, and the effect decrease with the increase of Mn content, but when the electric field is large enough, it will destroy the excitonic effect. The results are meaningful in design of optoelectronic device based on PQW.

Key words: optoelectronics, binding energy, variational method, exciton, Cd1-xMnxTe/CdTe parabolic quantum well

CLC Number:

0471.3

ZHANG Jin-feng, WANG Hai-long, Gong Qian. Binding energies of excitons in symmetrical Cd1-xMnxTe/CdTe parabolic quantum well[J]. J4, 2015, 32(5): 635-640.

References

[1]Yang Shuang Bo.Effect of doping concentration and doping thickness on the structure of electronic state of the Si uniformly doped GaAs quantum well[J].物理学报, 2013, 62(15):157301-157301
[2]Zhou Wang Min, Wang Chong Yu.The strain distribution of low dimensional semiconductor materials[J].物理学报, 2004, 53(12):4308-4313
[3] Albrecht K F, Wang H B, M¨uhlbacher L, Thoss M, Komnik A,.Bistability signatures in nonequilibrium charge transport through molecular quantum dots.[J].Phys Rev B, 2012, , 86,(8):141.-142
[4]You Hai-Long, Zhang Chun-Fu.Influence of optical interference and carrier lifetime on the short circuit current density of organic bulk heterojunction solar cells[J].Chin. Phys. B, 2009, 18(1):349-356
[5]Zhang Hong, Zhang Chun Yuan, Zhang Hui Liang et al.Charged excitons in parabolic quantum-well wires under magnetic filed[J].物理学报, 2011, 60(7):077301-077301
[6]Zhang Hong, Liu Lei, Liu Jian-Jun.Binding energies of excitons in symmetrical GaAsAl03Ga0.7 As double quantum wells[J].物理学报, 2007, 56(1):487-490
[7]Sergio C S, Gusev G M, Leite J R, et al .Coexistence of two and t hree-dimensional Landau states in a wide parabolic quantum well.[J].Phys Rev B, 2001, 64(11):1153141-1153141
[8]Herling G H, Rustgi M L.Spatially dependent effective mass and optical properties in a finite parabolic quant um wells..[J].Appl Phys,, 1992, 71 .(2):796.-799
[9] Qi X H, Kong X Y, Lin J Y.Effect of a spatially dependent effective mass on t he hydrogenic impurity binding energy in a finite parabolic quantum well[J].[J].PhysRevB, 1998, 58 (16):10578-10578
[10]Zhang Bing Po, Cai Chun Feng, Cai Xi Kun et al.Study of growth of [111]-oriented CdTe thin films by MBE[J].物理学报, 2012, 61(4):046802-046802
[11]Wu Xuan Zhi.High-efficiency polycrystalline CdTe thin-film solarcells[J].Solar Energy, 2004, 77(6):803-814
[12] Ferekides C S, Mamazza R, Balasubramanian U, et al.Transparent conductors and buffer layers for CdTe solar cells[J]. [J].Thin Solid Films, 2005, 11(480): 224.- 224.
[13]Zhu Meng Long, Dong Yu Lan, Zhong Hai Zheng et al.Exciton spin relaxation dynamics in CdTe quantum dots at room temperature[J].物理学报, 2014, 63(12):127202-127202
[14]Liu Ting Liang, He Xu Ling, Zhang Jing Quan, Feng Liang Heng, Wu Li Li, Li Wei, Zeng Guang Geng, .Effect of ZnO films on CdTe solar cells[J][J].半导体学报, 2012, , 33(9):3003-3006.
[15]Woitowicz T, Kutuowski M, Surma M， elal, parabolic quantum well of diluted magnetic semiconductor Cd1-xMnxTe [J.Appl[J].phys. Lett, 1996, 68(23):3326-3329
[16]Zhao Fengqi，Sarula.Binding Energy of a Hydrogenic Impurity in a Finite Parabolic Quantum Well Under an External Electric Field[J].半导体学报, 2006, 27(5):830-833
[17]Zhang Hong, Liu Lei, Liu Jian-Jun.Binding energies of excitons in symmetrical GaAsAl03Ga0.7 As double quantum wells[J].物理学报, 2007, 56(1):487-490
[18] Yin Xin, Wang Hai Long, Gong Qian, Feng Song Lin.Binding energy of hydrogenic donor impurity in GaInAsP /InP stepped quantum well [J]., 2013, 30(2) 236-242(in Chinese).[J].量子电子学报, 2013, 30(2):236-242
[19]Wang Wen Juan, Wang Hai Long, Gong Qian et al.External electric field effect on exciton binding energy in InGaAsPInP quantum wells[J].物理学报, 2013, 62(23):237104-237104
[20] Dacal L C O, Brum J A .Binding energy of charged excitons in semiconductor quantum wells in the presence of longitudinal electric fields[J]. [J].Phys Rev B, 2002, 65 ( 11): 115324- 115324
[21] Chen Yingjie, Xiao Jinglin.Influences of Coulomb field on probability density of parabolic linear bound potential quantum dot qubit [J]..[J].量子电子学报Chinese Journal of Quantum Electronics, 2012, 29(5):602-608.
[22]Deng Yanping, Lü Binbin, Tian Qiang.Excitons and effects of phonons on excitons in asymmetric square quantum well[J].物理学报, 2010, 59(7):4961-4966
[23]Wang Hailong, Jing Liming, Gong Qian, Feng Songlin. Bistability signatures in nonequilibrium charge transport through molecular quantum dots[J][J].Physica B, 2009,, 404(1):122-126
[24] Meng Jing, Wang Hai-long，Gong Qian，Feng Song-lin.Coexistence of two and t hree-dimensional Landau states in a wide parabolic quantum well[J].[J].量子电子学报Chinese Journal of Quantum Electronics, 2013,, 30( 3 ): 360- 366.