Excitonic diffusion dynamics in ZnO

被引：12

作者：

Jeong, H. ^{[1
]}

Min, K. ^{[1
]}

Byun, S. ^{[1
]}

Stanton, C. J. ^{[2
]}

Reitze, D. H. ^{[2
]}

Yoo, J. K. ^{[3
]}

Yi, G. C. ^{[3
]}

Jho, Y. D. ^{[1
]}

机构：

[1] Gwangju Inst Sci & Technol, Sch Informat & Commun, Kwangju 500712, South Korea

[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[3] Seoul Natl Univ, Sch Phys & Astron, Seoul 151742, South Korea

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 09期

基金：

美国国家科学基金会;

关键词：

diffusion; excitons; II-VI semiconductors; nanorods; reflectivity; time resolved spectra; wide band gap semiconductors; zinc compounds; NANORODS; GROWTH; LASERS; GE;

D O I：

10.1063/1.3690055

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate excitonic carrier diffusion in both bulk ZnO and nanorods (NRs). Using time-resolved differential reflectivity spectroscopy, we observe a fast decaying component together with a longer exponential relaxation. In bulk ZnO, we find that the fast decay term (similar to 1 ps) originates from excitonic diffusion along the growth direction. By probing at both the A and B excitons, we find different diffusion coefficients for each. In ZnO nanorods, the diffusion contribution is missing. We attribute this to two effects: (1) defects in the nanorods substantially slow the diffusion process and (2) excitons in nanorods are generated more uniformly than in bulk. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3690055]

引用

页数：3

共 50 条

[21] Excitonic fine structure and recombination dynamics in single-crystalline ZnO -: art. no. 195207
Teke, A
Özgür, Ü
Dogan, S
Gu, X
Morkoç, H
Nemeth, B
Nause, J
Everitt, HO
PHYSICAL REVIEW B, 2004, 70 (19) : 1 - 10
[22] Excitonic effects in ZnO nanowires and hollow nanotubes
Willander, M.
Lozovik, Y. E.
Zhao, Q. X.
Nur, O.
Hu, Q-H
Klason, P.
LIGHT-EMITTING DIODES: RESEARCH, MANUFACTURING, AND APPLICATIONS XI, 2007, 6486
[23] EXCITONIC DIFFUSION AND RECOMBINATION PROCESSES IN CUCL
GOMES, MJM
LEVY, R
HONERLAGE, B
JOURNAL OF LUMINESCENCE, 1991, 48-9 : 83 - 86
[24] Excitonic diffusion in thin molecular films
Sajfert, V
Setrajcic, J
Tosic, B
Djajic, R
CZECHOSLOVAK JOURNAL OF PHYSICS, 2004, 54 (09) : 975 - 988
[25] Excitonic spectrum of the ZnO/ZnMgO quantum wells
M. A. Bobrov
A. A. Toropov
S. V. Ivanov
A. El-Shaer
A. Bakin
A. Waag
Semiconductors, 2011, 45
[26] Laser emission with excitonic gain in a ZnO planar microcavity
Guillet, T.
Brimont, C.
Valvin, P.
Gil, B.
Bretagnon, T.
Medard, F.
Mihailovic, M.
Zuniga-Perez, J.
Leroux, M.
Semond, F.
Bouchoule, S.
APPLIED PHYSICS LETTERS, 2011, 98 (21)
[27] On mechanism of NO2 detection by ZnO excitonic luminescence
Orabona, E.
Pallotti, D.
Fioravanti, A.
Gherardi, S.
Sacerdoti, M.
Carotta, M. C.
Maddalena, P.
Lettieri, S.
SENSORS AND ACTUATORS B-CHEMICAL, 2015, 210 : 706 - 711
[28] On the nature of the effect of adsorbed oxygen on the excitonic photoluminescence of ZnO
Titov, V. V.
Lisachenko, A. A.
Akopyan, I. Kh.
Labzowskaya, M. E.
Novikov, B. V.
JOURNAL OF LUMINESCENCE, 2018, 195 : 153 - 158
[29] Study of excitonic emission in highly faceted ZnO rods
Kwok, WM
Djurisic, AB
Leung, YH
Chan, WK
Phillips, DL
Chen, HY
Wu, CL
Gwo, S
Xie, MH
CHEMICAL PHYSICS LETTERS, 2005, 412 (1-3) : 141 - 144
[30] Sub-nanosecond excitonic luminescence in ZnO:In nanocrystals
Grigorjeva, Larisa
Grube, Jurgis
Bite, Ivita
Zolotarjovs, Aleksejs
Smits, Krisjanis
Millers, Donats
Rodnyi, Piotr
Chernenko, Kirill
RADIATION MEASUREMENTS, 2019, 123 : 69 - 73

← 1 2 3 4 5 →