Photoexcitation Dynamics in Films of C60 and Zn Phthalocyanine with a Layered Nanostructure

被引：35

作者：

Lane, Paul A. ^{[1
]}

Cunningham, Paul D. ^{[1
]}

Melinger, Joseph S. ^{[1
]}

Kushto, Gary P. ^{[1
]}

Esenturk, Okan ^{[2
]}

Heilweil, Edwin J. ^{[2
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 07期

关键词：

CHARGE-TRANSFER; CARRIER DYNAMICS; GENERATION; TRANSIENT; EXCITONS; STATE; CELLS;

D O I：

10.1103/PhysRevLett.108.077402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We elucidate photoexcitation dynamics in C-60 and zinc phthalocyanine (ZnPc) from picoseconds to milliseconds by transient absorption and time-resolved terahertz spectroscopy. Autoionization of C-60 is a precursor to photocarrier generation. Decay of the terahertz signal is due to decreasing photocarrier mobility over the first 20 ps and thereafter reflects recombination dynamics. Singlet diffusion rates in C-60 are determined by modeling the rise of ground state bleaching of ZnPc absorption following C-60 excitation. Recombination dynamics transform from bimolecular to monomolecular as the layer thickness is reduced, revealing a metastable exciplex at the C-60/ZnPc interface with a lifetime of 150 mu s.

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页数：5

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共 37 条

[1] Photoinduced charge carrier generation in a poly(3-hexylthiophene) and methanofullerene bulk heterojunction investigated by time-resolved terahertz spectroscopy [J].

Ai, Xin ;

Beard, Matthew C. ;

Knutsen, Kelly P. ;

Shaheen, Sean E. ;

Rumbles, Garry ;

Ellingson, Randy J. .

JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (50) :25462-25471

[2] Morphology effects on charge generation and recombination dynamics at ZnPc:C60 bulk hetero-junctions using time-resolved terahertz spectroscopy [J].

Bartelt, Andreas F. ;

Strothkaemper, Christian ;

Schindler, Wolfram ;

Fostiropoulos, Konstantinos ;

Eichberger, Rainer .

APPLIED PHYSICS LETTERS, 2011, 99 (14)

[3] Photocarrier relaxation through the manifold of localized states in a polymer-fullerene bulk heterojunction material [J].

Coates, Nelson E. ;

Moses, Daniel ;

Heeger, Alan J. .

APPLIED PHYSICS LETTERS, 2011, 98 (10)

[4] Carrier dynamics resulting from above and below gap excitation of P3HT and P3HT/PCBM investigated by optical-pump terahertz-probe spectroscopy [J].

Cunningham, Paul D. ;

Hayden, L. Michael .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (21) :7928-7935

[5] Role of the Charge Transfer State in Organic Donor-Acceptor Solar Cells [J].

Deibel, Carsten ;

Strobel, Thomas ;

Dyakonov, Vladimir .

ADVANCED MATERIALS, 2010, 22 (37) :4097-4111

[6] TRANSIENT SPECTROSCOPY OF EXCITONS AND POLARONS IN C-60 FILMS FROM FEMTOSECONDS TO MILLISECONDS [J].

DICK, D ;

WEI, X ;

JEGLINSKI, S ;

BENNER, RE ;

VARDENY, ZV ;

MOSES, D ;

SRDANOV, VI ;

WUDL, F .

PHYSICAL REVIEW LETTERS, 1994, 73 (20) :2760-2763

[7] Ultrafast charge-transfer processes at an oriented phthalocyanine/C60 interface [J].

Dutton, G. J. ;

Jin, W. ;

Reutt-Robey, J. E. ;

Robey, S. W. .

PHYSICAL REVIEW B, 2010, 82 (07)

[8] Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Films Assessed by Time-Resolved Terahertz Spectroscopy [J].

Esenturk, Okan ;

Melinger, Joseph S. ;

Lane, Paul A. ;

Heilweil, Edwin J. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (43) :18842-18850

[9] MOBILITY OF CHARGE-CARRIERS IN VAPOR-PHASE GROWN C-60 SINGLE-CRYSTAL [J].

FRANKEVICH, E ;

MARUYAMA, Y ;

OGATA, H .

CHEMICAL PHYSICS LETTERS, 1993, 214 (01) :39-44

[10] GENERATION OF CHARGE CARRIERS IN ANTHRACENE WITH POLARIZED LIGHT [J].

GEACINTOV, N ;

POPE, M .

JOURNAL OF CHEMICAL PHYSICS, 1967, 47 (03) :1194-+

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