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Room Temperature Strong Emission and Excitonic Enhancement in Multiple-Stacked Nano-Porous ZnO Thin Film
Darma Y.a, Chichvarina O.b, Purbayanto M.A.K.a, Nurfani E.a, Setiawan F.G.a, Ding J.b, Rusydi A.b
a Quantum Semiconductor and Devices Lab, Department of Physics, Institut Teknologi Bandung, Bandung, 40132, Indonesia
b Department of Material Science and Engineering, National University of Singapore, Singapore, 117574, Singapore
[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 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimElectronic and structural properties of ZnO films before and after H2 annealing treatment are studied. The initial system is smooth amorphous ZnO films that are intentionally grown at room temperature. A dramatic change is found in the crystallinity and the surface transforms to a multiple-stacked nanoporous structure upon annealing as observed by scanning electron microscopy and X-ray diffraction. Photoluminescence spectroscopy shows the presence of a new mid-gap state below the first optical transition, and the annealing treatment transforms the ZnO system to more transparent film. Interestingly, it is found that the structural evolution changes the dielectric function measured by high-resolution, angle-dependent spectroscopic ellipsometry and this generates strong emission at ≈2.5 eV. These results show the importance of structural modification via H2 annealing to control the optical properties and electronic structure of ZnO films.[/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]Annealing treatments,Dielectric functions,Electronic and structural properties,Green emissions,multiple-stacked porous,Nanoporous structures,Structural evolution,Structural modifications[/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]excitons,multiple-stacked porous,spectroscopic ellipsometry,strong green emission,ZnO[/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 partly supported by Ministry of Research Technology and Higher Education (Kemenristekditkti) Republic of Indonesia through Penelitian Dasar Unggulan Perguruan Tinggi (PDUPT) 2018 (532w/l1. C01/PL/2018), Hibah Kompetensi Kemenristekdikti 2018, Riset KK ITB 2018 (324f/I1.CO1/PL/2018) and P3MI 2018 ITB research program (1275G/l1.C01/PL/2018).[/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/10.1002/pssa.201800458[/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]