Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry
Knowledge of tunability of complex optical constants of colloidal CdSe nanoplatelets (NPLs) thin films is essential for accurate modeling and design of NPL-containing optoelectronic devices. Here, dielectric functions, complex optical conductivities, and absorption coefficients of a series of CdSe N...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/168701 |
| _version_ | 1811689968341352448 |
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| author | Zhang, Zitong Thung, Yi Tian Chen, Xiaoxuan Wang, Lin Fan, Weijun Ding, Lu Sun, Handong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Zhang, Zitong Thung, Yi Tian Chen, Xiaoxuan Wang, Lin Fan, Weijun Ding, Lu Sun, Handong |
| author_sort | Zhang, Zitong |
| collection | NTU |
| description | Knowledge of tunability of complex optical constants of colloidal CdSe nanoplatelets (NPLs) thin films is essential for accurate modeling and design of NPL-containing optoelectronic devices. Here, dielectric functions, complex optical conductivities, and absorption coefficients of a series of CdSe NPL films with a varying number of atomic layers were investigated in a combination of spectroscopic ellipsometry techniques and transmittance measurements over a broad spectral range. Fine electronic structures were deciphered from the dielectric functions. Oscillator strengths at the lowest exciton resonance up to 0.62 for a series of CdSe NPL films were also determined. From our results, increasing the number of monolayers was found to boost the complex optical constants and the amplitude of the coupling strength of the fundamental exciton state mainly due to higher inorganic volume filling factors and pronounced surface passivation. Our work gives insights into both the interpretation and improvements of performance of CdSe NPL-based photoelectronic applications. |
| first_indexed | 2024-10-01T05:56:32Z |
| format | Journal Article |
| id | ntu-10356/168701 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:56:32Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1687012023-06-16T01:44:24Z Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry Zhang, Zitong Thung, Yi Tian Chen, Xiaoxuan Wang, Lin Fan, Weijun Ding, Lu Sun, Handong School of Physical and Mathematical Sciences School of Electrical and Electronic Engineering Centre for Disruptive Photonic Technologies (CDPT) Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials Cadmium Selenide Thin Films Knowledge of tunability of complex optical constants of colloidal CdSe nanoplatelets (NPLs) thin films is essential for accurate modeling and design of NPL-containing optoelectronic devices. Here, dielectric functions, complex optical conductivities, and absorption coefficients of a series of CdSe NPL films with a varying number of atomic layers were investigated in a combination of spectroscopic ellipsometry techniques and transmittance measurements over a broad spectral range. Fine electronic structures were deciphered from the dielectric functions. Oscillator strengths at the lowest exciton resonance up to 0.62 for a series of CdSe NPL films were also determined. From our results, increasing the number of monolayers was found to boost the complex optical constants and the amplitude of the coupling strength of the fundamental exciton state mainly due to higher inorganic volume filling factors and pronounced surface passivation. Our work gives insights into both the interpretation and improvements of performance of CdSe NPL-based photoelectronic applications. Ministry of Education (MOE) The authors thank the financial from the Singapore Ministry of Education (MOE) AcRF Tier 1 RG95/19 (S). 2023-06-16T01:44:24Z 2023-06-16T01:44:24Z 2021 Journal Article Zhang, Z., Thung, Y. T., Chen, X., Wang, L., Fan, W., Ding, L. & Sun, H. (2021). Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry. Journal of Physical Chemistry Letters, 12(1), 191-198. https://dx.doi.org/10.1021/acs.jpclett.0c03304 1948-7185 https://hdl.handle.net/10356/168701 10.1021/acs.jpclett.0c03304 33325711 2-s2.0-85099058895 1 12 191 198 en RG95/19 (S) Journal of Physical Chemistry Letters © 2020 American Chemical Society. All rights reserved. |
| spellingShingle | Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials Cadmium Selenide Thin Films Zhang, Zitong Thung, Yi Tian Chen, Xiaoxuan Wang, Lin Fan, Weijun Ding, Lu Sun, Handong Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title | Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title_full | Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title_fullStr | Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title_full_unstemmed | Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title_short | Study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| title_sort | study of complex optical constants of neat cadmium selenide nanoplatelets thin films by spectroscopic ellipsometry |
| topic | Science::Physics::Optics and light Engineering::Materials::Photonics and optoelectronics materials Cadmium Selenide Thin Films |
| url | https://hdl.handle.net/10356/168701 |
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