Maximal Visible Light Energy Transfer to Ultrathin Semiconductor Films Enabled by Dispersion Control
- Authors
- Jung, Gwang-Hun; Yoo, SeokJae; Kim, Jin-Soo; Park, Q-Han
- Issue Date
- 4월-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- light absorption; permittivity tailoring; ultrathin semiconductor films
- Citation
- ADVANCED OPTICAL MATERIALS, v.7, no.7
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED OPTICAL MATERIALS
- Volume
- 7
- Number
- 7
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/66550
- DOI
- 10.1002/adom.201801229
- ISSN
- 2195-1071
- Abstract
- Increasing light absorption in an ultrathin semiconductor is critical for developing thin-film photovoltaic devices. Here, it is shown that a maximal absorption of visible light is possible through controlling the dispersion of thin-film materials. The ideal dispersion relation is determined for the permittivity of a thin film placed on a reflector with a dielectric spacer, and it is explained how the ideal dispersion relation can be realized for semiconductor materials possessing bandgaps. To experimentally verify dispersion control and maximal absorption, the permittivity of lead selenide (PbSe) thin film is tailored by controlling its polycrystallinity through the sputtering conditions. The measured reflectance of a dispersion-controlled PbSe film (9 nm) deposited on an SiO2 (48 nm)/Al substrate shows a record level of absorbance for PbSe film of 88% taken as an average over the entire visible spectrum. This value is close to the theoretical maximum value of 95%. Overall, the dispersion control scheme offers promising avenues for thin-film solar cell research.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Science > Department of Physics > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.