Photoexcited carrier relaxation dynamics in pentacene probed by ultrafast optical spectroscopy: Influence of morphology on relaxation processes

被引：24

作者：

Thorsmolle, V. K. ^{[1
,2
]}

Averitt, R. D. ^{[2
,3
]}

Demsar, J. ^{[2
,4
,5
,6
]}

Smith, D. L. ^{[2
]}

Tretiak, S. ^{[2
]}

Martin, R. L. ^{[2
]}

Chi, X. ^{[2
,7
]}

Crone, B. K. ^{[2
]}

Ramirez, A. P. ^{[2
,8
]}

Taylor, A. J. ^{[2
]}

机构：

[1] Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Boston Univ, Boston, MA 02215 USA

[4] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

[5] Univ Konstanz, Ctr Appl Photon, D-78457 Constance, Germany

[6] Jozef Stefan Inst, Dept Complex Matter, Ljubljana, Slovenia

[7] Texas A&M Univ Kingsville, Kingsville, TX 78363 USA

[8] Bell Labs, Alcatel Lucent, Murray Hill, NJ 07974 USA

来源：

PHYSICA B-CONDENSED MATTER | 2009年 / 404卷 / 19期

关键词：

Ultrafast spectroscopy; Organic semiconductors; Sample morphology; EXCITON DYNAMICS; CHARGE-TRANSFER; LOW-COST; POLYMERS; FILMS; CELLS;

D O I：

10.1016/j.physb.2009.07.063

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present a comparative study of ultrafast photoexcited state relaxation in pentacene single crystals and in pure and C(60)-doped pentacene films using optical pump-probe spectroscopy. The photoinduced absorption spectra in pentacene crystals is consistent with a dominant singlet-triplet fission decay channel for above-gap excitation. This decay channel is suppressed in thin films and even further suppressed by electron trapping in C60-doped films. Thus we show that suppression of triplet state production, which is necessary for free carrier formation and thus photovoltaic and photodiode performance, is controllable via sample morphology. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：3127 / 3130

页数：4

共 30 条

[1] Charge-transfer and energy-transfer processes in π-conjugated oligomers and polymers:: A molecular picture [J].

Brédas, JL ;

Beljonne, D ;

Coropceanu, V ;

Cornil, J .

CHEMICAL REVIEWS, 2004, 104 (11) :4971-5003

[2] LIGHT-EMITTING-DIODES BASED ON CONJUGATED POLYMERS [J].

BURROUGHES, JH ;

BRADLEY, DDC ;

BROWN, AR ;

MARKS, RN ;

MACKAY, K ;

FRIEND, RH ;

BURN, PL ;

HOLMES, AB .

NATURE, 1990, 347 (6293) :539-541

[3] Femtosecond vibrational dynamics of self-trapping in a quasi-one-dimensional system [J].

Dexheimer, SL ;

Van Pelt, AD ;

Brozik, JA ;

Swanson, BI .

PHYSICAL REVIEW LETTERS, 2000, 84 (19) :4425-4428

[4] The path to ubiquitous and low-cost organic electronic appliances on plastic [J].

Forrest, SR .

NATURE, 2004, 428 (6986) :911-918

[5] Exciton dynamics in soluble poly(p-phenylene-vinylene): Towards an ultrafast excitonic switch [J].

Frolov, SV ;

Liess, M ;

Lane, PA ;

Gellermann, W ;

Vardeny, ZV ;

Ozaki, M ;

Yoshino, K .

PHYSICAL REVIEW LETTERS, 1997, 78 (22) :4285-4288

[6] Colloquium: Electronic transport in single-crystal organic transistors [J].

Gershenson, M. E. ;

Podzorov, V. ;

Morpurgo, A. F. .

REVIEWS OF MODERN PHYSICS, 2006, 78 (03) :973-989

[7] Organic light emitting devices [J].

Godlewski, J. ;

Obarowska, M. .

OPTO-ELECTRONICS REVIEW, 2007, 15 (04) :179-183

[8]

Hegmann F.A., 2003, PHYS CANADA, V59, P127

[9] Picosecond transient photoconductivity in functionalized pentacene molecular crystals probed by terahertz pulse spectroscopy [J].

Hegmann, FA ;

Tykwinski, RR ;

Lui, KPH ;

Bullock, JE ;

Anthony, JE .

PHYSICAL REVIEW LETTERS, 2002, 89 (22) :227403-227403

[10] Efficiency of exciton and charge carrier photogeneration in a semiconducting polymer [J].

Hendry, E ;

Schins, JM ;

Candeias, LP ;

Siebbeles, LDA ;

Bonn, M .

PHYSICAL REVIEW LETTERS, 2004, 92 (19) :196601-1

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