Carrier Multiplication in CdTe Quantum Dots by Single-photon Timing Spectroscopy

被引:51
作者
Kobayashi, Yoichi [1 ]
Udagawa, Takeshi [1 ]
Tamai, Naoto [1 ]
机构
[1] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Chem, Sanda 6691537, Japan
关键词
MULTIPLE EXCITON GENERATION; PBSE; NANOCRYSTALS; EFFICIENCY; TIME;
D O I
10.1246/cl.2009.830
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Carrier multiplication (CM) was observed in CdTe quantum dots (QDs) capped with tetradecylphosphonic acid (TDPA) at h nu/E-g > 2.5 by picosecond single-photon timing spectroscopy, where h nu and E-g are the excitation and the band gap energies, and the CM efficiency increased rapidly with the increase of h nu/E-g. No CM was observed less than the threshold value of h nu/E-g approximate to 2.5, which is close to that of CdSe QDs. As compared to a previous report by Nair and Bawendi, our result suggests that CM is sensitive to the QD surface conditions.
引用
收藏
页码:830 / 831
页数:2
相关论文
共 15 条
[1]   Variations in the Quantum Efficiency of Multiple Exciton Generation for a Series of Chemically Treated PbSe Nanocrystal Films [J].
Beard, Matthew C. ;
Midgett, Aaron G. ;
Law, Matt ;
Semonin, Octavi E. ;
Ellingson, Randy J. ;
Nozik, Arthur J. .
NANO LETTERS, 2009, 9 (02) :836-845
[2]   On the absence of detectable carrier multiplication in a transient absorption study of InAs/CdSe/ZnSe core/shell1/shell2 quantum dots [J].
Ben-Lulu, Meirav ;
Mocatta, David ;
Bonn, Mischa ;
Banin, Uri ;
Ruhman, Sanford .
NANO LETTERS, 2008, 8 (04) :1207-1211
[3]   Fluorescence lifetime standards for time and frequency domain fluorescence spectroscopy [J].
Boens, Noel ;
Qin, Wenwu ;
Basaric, Nikola ;
Hofkens, Johan ;
Ameloot, Marcel ;
Pouget, Jacques ;
Lefevre, Jean-Pierre ;
Valeur, Bernard ;
Gratton, Enrico ;
vandeVen, Martin ;
Silva, Norberto D., Jr. ;
Engelborghs, Yves ;
Willaert, Katrien ;
Sillen, Alain ;
Rumbles, Garry ;
Phillips, David ;
Visser, Antonie J. W. G. ;
van Hoek, Arie ;
Lakowicz, Joseph R. ;
Malak, Henryk ;
Gryczynski, Ignacy ;
Szabo, Arthur G. ;
Krajcarski, Don T. ;
Tamai, Naoto ;
Miura, Atsushi .
ANALYTICAL CHEMISTRY, 2007, 79 (05) :2137-2149
[4]   Highly efficient multiple exciton generation in colloidal PbSe and PbS quantum dots [J].
Ellingson, RJ ;
Beard, MC ;
Johnson, JC ;
Yu, PR ;
Micic, OI ;
Nozik, AJ ;
Shabaev, A ;
Efros, AL .
NANO LETTERS, 2005, 5 (05) :865-871
[5]  
GAPONENKO SV, 1998, OPTICAL PROPERTIES S, P19
[6]   Effects of Size and Capping Reagents on Biexciton Auger Recombination Dynamics of CdTe Quantum Dots [J].
Kobayashi, Yoichi ;
Pan, Lingyun ;
Tamai, Naoto .
JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (27) :11783-11789
[7]   PbTe colloidal nanocrystals: Synthesis, characterization, and multiple exciton generation [J].
Murphy, JE ;
Beard, MC ;
Norman, AG ;
Ahrenkiel, SP ;
Johnson, JC ;
Yu, PR ;
Micic, OI ;
Ellingson, RJ ;
Nozik, AJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (10) :3241-3247
[8]   Carrier multiplication yields of CdSe and CdTe nanocrystals by transient photoluminescence spectroscopy [J].
Nair, Gautham ;
Bawendi, Moungi G. .
PHYSICAL REVIEW B, 2007, 76 (08)
[9]   Carrier multiplication yields in PbS and PbSe nanocrystals measured by transient photoluminescence [J].
Nair, Gautham ;
Geyer, Scott M. ;
Chang, Liang-Yi ;
Bawendi, Moungi G. .
PHYSICAL REVIEW B, 2008, 78 (12)
[10]   Effect of electronic structure on carrier multiplication efficiency: Comparative study of PbSe and CdSe nanocrystals [J].
Schaller, RD ;
Petruska, MA ;
Klimov, VI .
APPLIED PHYSICS LETTERS, 2005, 87 (25) :1-3