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PhysRevB.86.245433.pdf | 618.54 kB | Adobe PDF | 見る/開く |
タイトル: | Ionization potentials of (112) and (112¯) facet surfaces of CuInSe2 and CuGaSe2 |
著者: | Hinuma, Yoyo Oba, Fumiyasu Kumagai, Yu Tanaka, Isao https://orcid.org/0000-0002-4616-118X (unconfirmed) |
著者名の別形: | 日沼, 洋陽 大場, 史康 |
発行日: | Dec-2012 |
出版者: | American Physical Society |
誌名: | Physical Review B |
巻: | 86 |
号: | 24 |
論文番号: | 245433 |
抄録: | The ionization potentials of the faceted and nonfaceted (110) surfaces of CuInSe2 (CIS) and CuGaSe2 (CGS), which are key components of CuIn1−xGaxSe2 (CIGS) thin-film solar cells, are investigated using first-principles calculations based on a hybrid Hartree-Fock density functional theory approach. Slab models of the chalcopyrite (110) surface with both (112) and (112̅ ) facets on each surface of the slab are employed. Surface energy evaluations point out that two types of faceted surfaces with point defects, namely a combination of CuIn (CuGa) and InCu (GaCu) antisites and a combination of Cu vacancies and InCu (GaCu) antisites, are the most stable depending on the chemical potentials. The ionization potentials are evaluated with two definitions: One highly sensitive to and the other less sensitive to localized surface states. The latter varies by 0.4 eV in CIS and 0.5 eV in CGS with the surface structure. The ionization potentials are reduced by 0.2 eV for faceted surfaces with CuIn (CuGa) and InCu (GaCu) antisites when the effects of the localized surface states are considered. The values of both ionization potentials are similar between CIS and CGS with a difference of about 0.1 eV for the most stable surface structures. |
著作権等: | ©2012 American Physical Society |
URI: | http://hdl.handle.net/2433/168510 |
DOI(出版社版): | 10.1103/PhysRevB.86.245433 |
出現コレクション: | 学術雑誌掲載論文等 |
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