Assessment of carrier-multiplication efficiency in bulk PbSe and PbS

被引：228

作者：

Pijpers, J. J. H. ^{[1
]}

Ulbricht, R. ^{[1
]}

Tielrooij, K. J. ^{[1
]}

Osherov, A. ^{[2
,3
]}

Golan, Y. ^{[2
,3
]}

Delerue, C. ^{[4
]}

Allan, G. ^{[4
]}

Bonn, M. ^{[1
]}

机构：

[1] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands

[2] Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel

[3] Ben Gurion Univ Negev, Ilse Katz Inst Nanosci & Nanotechnol, IL-84105 Beer Sheva, Israel

[4] Inst Elect Microelect & Nanotechnol, Dept ISEN, UMR 8520, CNRS, F-59046 Lille, France

来源：

NATURE PHYSICS | 2009年 / 5卷 / 11期

基金：

以色列科学基金会;

关键词：

MULTIPLE EXCITON GENERATION; IMPACT IONIZATION; COLLOIDAL PBSE; QUANTUM DOTS;

D O I：

10.1038/NPHYS1393

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

One of the important factors limiting solar-cell efficiency is that incident photons generate one electron-hole pair, irrespective of the photon energy. Any excess photon energy is lost as heat. The possible generation of multiple charge carriers per photon (carrier multiplication) is therefore of great interest for future solar cells(1). Carrier multiplication is known to occur in bulk semiconductors, but has been thought to be enhanced significantly in nanocrystalline materials such as quantum dots, owing to their discrete energy levels and enhanced Coulomb interactions(1-3). Contrary to this expectation, we demonstrate here that, for a given photon energy, carrier multiplication occurs more efficiently in bulk PbS and PbSe than in quantum dots of the same materials. Measured carrier-multiplication efficiencies in bulk materials are reproduced quantitatively using tight-binding calculations, which indicate that the reduced carrier-multiplication efficiency in quantum dots can be ascribed to the reduced density of states in these structures.

引用

页码：811 / 814

页数：4

共 30 条

[11] Efficient Multiple Exciton Generation Observed in Colloidal PbSe Quantum Dots with Temporally and Spectrally Resolved Intraband Excitation [J].

Ji, Minbiao ;

Park, Sungnam ;

Connor, Stephen T. ;

Mokari, Taleb ;

Cui, Yi ;

Gaffney, Kelly J. .

NANO LETTERS, 2009, 9 (03) :1217-1222

[12] Femtosecond 1P-to-1S electron relaxation in strongly confined semiconductor nanocrystals [J].

Klimov, VI ;

McBranch, DW .

PHYSICAL REVIEW LETTERS, 1998, 80 (18) :4028-4031

[13] Spectral and dynamical properties of multilexcitons in semiconductor nanocrystals [J].

Klimov, Victor I. .

ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 2007, 58 :635-673

[14] New Aspects of Carrier Multiplication in Semiconductor Nanocrystals [J].

Mcguire, John A. ;

Joo, Jin ;

Pietryga, Jeffrey M. ;

Schaller, Richard D. ;

Klimov, Victor I. .

ACCOUNTS OF CHEMICAL RESEARCH, 2008, 41 (12) :1810-1819

[15] 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

[16] Carrier multiplication yields of CdSe and CdTe nanocrystals by transient photoluminescence spectroscopy [J].

Nair, Gautham ;

Bawendi, Moungi G. .

PHYSICAL REVIEW B, 2007, 76 (08)

[17] 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)

[18] Quantum dot solar cells [J].

Nozik, AJ .

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 2002, 14 (1-2) :115-120

[19] Slow Electron Cooling in Colloidal Quantum Dots [J].

Pandey, Anshu ;

Guyot-Sionnest, Philippe .

SCIENCE, 2008, 322 (5903) :929-932

[20] Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots (vol 111, pg 4146, 2007) [J].

Pijpers, J. J. H. ;

Hendry, E. ;

Milder, M. T. W. ;

Fanciulli, R. ;

Savolainen, J. ;

Herek, J. L. ;

Vanmaekelbergh, D. ;

Ruhman, S. ;

Mocatta, D. ;

Oron, D. ;

Aharoni, A. ;

Banin, U. ;

Bonn, M. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (12) :4783-4784

← 1 2 3 →