Interplay Between Strain and Thickness on the Effective Carrier Lifetime of Buffer-Mediated Epitaxial Germanium Probed by the Photoconductance Decay Technique
Interplay Between Strain and Thickness on the Effective Carrier Lifetime of Buffer-Mediated Epitaxial Germanium Probed by the Photoconductance Decay Technique
复制标题
通过光电导衰减技术探测缓冲介导的外延锗的有效载流子寿命的应变和厚度之间的相互作用
DOI:
10.1021/acsaelm.3c00256
复制
发表时间:
2023
影响因子:
4.7
通讯作者:
Hudait, Mantu K.
中科院分区:
文献类型:
--
作者:
Bhattacharya, Shuvodip;Johnston, Steven W.;Datta, Suman;Hudait, Mantu K.
We report contactless effective minority carrier lifetime of epitaxially grown unstrained and in-plane <110> biaxially tensile-strained (001) germanium (ε-Ge) epilayers measured using microwave-reflectance photoconductance decay measurements. Strained Ge epilayers were grown using InxGa1–xAs linearly graded buffers on (001) GaAs substrates. Using homogeneous excitation of unstrained Ge epilayers, thickness-dependent separation of minority carrier lifetime components under low injection conditions yielded a bulk lifetime of 114 ± 2 ns and low surface recombination velocity of 21.3 ± 0.04 cm/s. More notably, an effective minority carrier lifetime of >100 ns obtained from sub-50 nm 1.6% tensile-strained Ge epilayers showed no degradation relative to the unstrained counterpart. Detailed material characterization using X-ray diffractometry revealed successful strain transfer of 0.61 and 0.89% to the Ge epilayers via InxGa1–xAs metamorphic buffers and confirms pseudomorphic growth. Lattice coherence observed at the ε-Ge epilayer and InxGa1–xAs buffer heterointerfaces via transmission electron microscopy substantiates the prime material quality achieved. The relatively high carrier lifetimes achieved are an indicator of excellent material quality and provide a path forward to realize low-threshold Ge laser sources.
登录
查看更多内容
影响因子:
9.5
作者:
Clavel, Michael;Saladukha, Dzianis;Hudait, Mantu K.
通讯作者:
Hudait, Mantu K.
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
R. Geiger;J. Frigerio;M. Süess;D. Chrastina;G. Isella;Ralph Spolenak;Jérôme Faist;H. Sigg
通讯作者:
H. Sigg
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
E. Gaubas;J. Vanhellemont;E. Simoen;I. Romandic;W. Geens;P. Clauws
通讯作者:
P. Clauws
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
Y. Mada
通讯作者:
Y. Mada
DOI:
--
发表时间:
2008
期刊:
ECS Transactions
影响因子:
--
作者:
K. Saraswat;Donghyun Kim;T. Krishnamohan;Duygii Kuzum;A. Okyay;A. Pethe;Hyun‐Yong Yu
通讯作者:
Hyun‐Yong Yu