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Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots
http://hdl.handle.net/2241/00130003
http://hdl.handle.net/2241/00130003b06db60a-d7ab-488c-a158-d7f4d0994d8a
名前 / ファイル | ライセンス | アクション |
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PCCP_17-18 (893.6 kB)
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Item type | Journal Article(1) | |||||
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公開日 | 2015-11-25 | |||||
タイトル | ||||||
タイトル | Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Sun, Jianhui
× Sun, Jianhui× Ikezawa, Michio× Wang, Xiuying× Jing, Pengtao× Li, Haibo× Zhao, Jialong× Masumoto, Yasuaki |
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著者別名 |
池沢, 道男
× 池沢, 道男 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots (CIS QDs) was studied by means of femtosecond transient-absorption (TA) and nanosecond time-resolved photoluminescence (PL) spectroscopy. Under strong excitation, the TA dynamics in CIS QDs is well described by a simple rate equation including single-carrier trapping, free-to-bound recombination, and trap-assisted Auger recombination. Under weak excitation, on the other hand, the PL decays of the QDs are composed of a short-lived component caused by surface trapping and a long-lived one caused by free-to-bound recombination. It is found that the surface trapping accelerates markedly with decreasing QD size while the free-to-bound radiative recombination hardly depends on the QD size. Besides this, we observed both a decrease in the PL lifetimes and a dynamic spectral redshift, which are attributed to the surface trapping and the coexistent inhomogeneous broadening in CIS QDs. The spectral redshift becomes less pronounced in CIS/ZnS core/shell QDs because of the suppression of the fast nonradiative recombination caused by the passivation of the surface traps. These results give clear evidence that the free-to-bound model is appropriate for interpreting the optical properties of CIS QDs. | |||||
書誌情報 |
Physical chemistry, chemical physics : PCCP 巻 17, 号 18, p. 11981-11989, 発行日 2015-05 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1463-9076 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11301773 | |||||
PubMed番号 | ||||||
識別子タイプ | PMID | |||||
関連識別子 | 25728207 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1039/C5CP00034C | |||||
権利 | ||||||
権利情報 | ©the Owner Societies 2015 | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | The Royal Society of Chemistry |