Excited-State Relaxation Dynamics of 3-Vinylthiophene-Terminated Silicon Quantum Dots

被引:12
|
作者
Groenewegen, Vincent [1 ,2 ]
Kuntermann, Volker [1 ,2 ]
Haarer, Dietrich [3 ]
Kunz, Michael [1 ,2 ]
Kryschi, Carola [1 ,2 ]
机构
[1] Univ Erlangen Nurnberg, Inst Phys Chem, Dept Chem & Pharm, D-91058 Erlangen, Germany
[2] Univ Erlangen Nurnberg, ICMM, D-91058 Erlangen, Germany
[3] Univ Bayreuth, BIMF, D-95447 Bayreuth, Germany
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 27期
关键词
POROUS SILICON; PHOTOLUMINESCENCE; NANOPARTICLES; LUMINESCENCE;
D O I
10.1021/jp100266w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In theory, silicon quantum dots (SiQDs) emit enhanced photoluminescence with a size-tunable spectrum in the visible range. In practice, surface states originating from oxide defect structures or organic ligands are strongly involved in exciton relaxation dynamics because the amplitudes of hole and electron wave functions are nonzero at the SiQD surface. In this study, SiQDs with well-defined surface properties were obtained through a wet-chemistry procedure providing SiQDs with adjustable sizes and oxide-free, 3-vinylthiophene-terminated surfaces. The 3-vinylthiophene-terminated SiQDs have a crystalline spherical 2 nm core and were observed to exhibit blue photoluminescence (similar to 460 nm) with a quantum yield and lifetime of ca. 23% and 1.3 ns, respectively. The interplay between electronically excited molecular states and conduction band states was examined upon direct monitoring of photoexcited carrier dynamics with femtosecond transient absorption spectroscopy. The 3-vinylthiophene ligands were found to act as surface-bound antennae that mediate ultrafast electron transfer or excitation energy transfer across the SiQD interface.
引用
收藏
页码:11693 / 11698
页数:6
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