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Tuning the point-defect evolution, optical transitions, and absorption edge of zinc oxide film by thermal exposure during molecular beam epitaxy growth
Darma Y.a, Muhammady S.a, Hendri Y.N.a, Sustini E.a, Widita R.a, Takase K.b
a Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia
b Department of Physics, College of Sciences and Technology, Nihon University, Chiyoda, Tokyo, 101-0062, Japan
[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]© 2018 Elsevier LtdWe study the optical properties of ZnO films grown using plasma-assisted molecular beam epitaxy. We employ three different growth temperatures (Tgrowth) of 298, 373, and 423 K. The XRD patterns and field-emission SEM images indicate that Tgrowth increment linearly increases the c-axis strain and average growth rate. The photoluminescence spectra show that Tgrowth increment from 298 to 373 K induces the blue-violet emission promoted by Zn interstitials (Zni). We also observe the blue emission promoted by the few O interstitials (Oi). However, this Tgrowth increment significantly reduces oxygen antisites (OZn) and eliminates oxygen and zinc vacancies (VO, VZn). We find that Tgrowth increment to 423 K enhances Oi and eliminates Zni inducing the excellent blue emission the O-rich condition. Notably, the point defects suppress the exciton-exciton scattering emission for Tgrowth = 373 and 423 K. Furthermore, the Kubelka-Munk spectra show that the strain provokes the free-excitonic absorption edge redshift. Our result emphasizes the significant thermal dependences of point-defect evolution, blue emission, and excitonic absorption in ZnO film. This study opens a possible application of ZnO in tunable-emission blue LEDs.[/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]Average growth rate,Exciton-exciton scattering,Excitonic absorption,Field emission SEM,Kubelka-Munk,Photoluminescence spectrum,Plasma assisted molecular beam epitaxy,Thermal dependences[/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]Kubelka-Munk spectra,Optical properties,Photoluminescence,Point defect,Zinc oxide[/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][{‘$’: ‘This work was funded by the Ministry of Research, Technology and Higher Education of the Republic of Indonesia Goverment: Hibah Kompetensi Kemenristekdikti 2018, P3MI research program 2018 ( 1275G/l1.C01/PL/2018 ), Penelitian Dasar Unggulan Perguruan Tinggi (PDUPT) program 2018 ( 532w/l1.C01/PL/2018 ), and Riset KK ITB 2018 ( 324f/l1.C01/PL/2018 ). Y.N.H acknowledges the Lembaga Pengelola Dana Pendidikan (LPDP) scholarship for master program.’}, {‘$’: ‘This work was funded by the Ministry of Research, Technology and Higher Education of the Republic of Indonesia Goverment: Hibah Kompetensi Kemenristekdikti 2018, P3MI research program 2018 (1275G/l1.C01/PL/2018), Penelitian Dasar Unggulan Perguruan Tinggi (PDUPT) program 2018 (532w/l1.C01/PL/2018), and Riset KK ITB 2018 (324f/l1.C01/PL/2018). Y.N.H acknowledges the Lembaga Pengelola Dana Pendidikan (LPDP) scholarship for master program.’}][/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/10.1016/j.mssp.2018.12.030[/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]