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Strong Modification of Excitons and Optical Conductivity for Different Dielectric Environments in ZnO Films
Darma Y.a,b, Marlina R.b, Herng T.S.a, Ding J.a, Rusydi A.a
a Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore
b Department of Physics, Institut Teknologi Bandung, Bandung, 40132, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2009-2012 IEEE.We study the evolution of excitons and optical conductivity of ZnO films on two different substrates (Pt and quartz) using three different Cu doping concentrations known as Cu:ZnO. The concentrations used in this paper were 0% (pure ZnO), 2%, and 8% of Cu. The results show that the excitons are strongly observed in the ZnO film on quartz (ZOQ). However, they are significantly suppressed in the ZnO film on Pt (ZOP). These imply that the interactions of the valence itinerant electrons in Pt with ZnO film are responsible for the electronic blocking of electron (e)-hole (h) pairs or excitons. Furthermore, as a function of Cu doping, the screening effects on excitonic states and the new localized interband transition were observed for the ZOP and ZOQ systems. Our results confirm the different origins of the reduction of excitonic effects and the importance of the dielectric environments to strongly modify excitons and optical conductivity in a wide band-gap semiconductor.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Different origins,Different substrates,Excitonic effect,Excitonic state,Inter-band transition,Itinerant electrons,Optical properties of photonic materials,Screening effect[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Optical properties of photonic materials,Spectroscopy[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1109/JPHOT.2016.2570419[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]