Ultrafast charge photogeneration in conjugated polymers

被引:12
作者
Miranda, PB [1 ]
Moses, D [1 ]
Heeger, AJ [1 ]
机构
[1] Univ Calif Santa Barbara, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA
关键词
time-resolved fast spectroscopy; photoinduced absorption spectroscopy; optical absorption and emission spectroscopy; photoconductivity; poly(phenylene vinylene) and derivatives;
D O I
10.1016/S0379-6779(00)00817-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The mechanism for ultrafast charge generation in po ly(paraphenylene-vinylene)-PPV and its soluble derivatives has been investigated by pump-probe spectroscopy. The quantum yield for charge generation (phi (ch)) as a function of pump photon energy has been measured by exciting the samples with ultrashort pulses (2.2 to 6.2 eV, similar to 100 fs pulsewidth) and probing the photoinduced absorption of infrared-active vibrational modes (IRAV). The ultrafast nature of charge generation, the significant quantum yield observed (phi (ch) similar to 0.1) and its weak photon energy dependence suggest that polarons are primary photoexcitations of conjugated polymers.
引用
收藏
页码:619 / 620
页数:2
相关论文
共 11 条
[1]   EXCITONS IN POLY(PARA-PHENYLENEVINYLENE) [J].
CHANDROSS, M ;
MAZUMDAR, S ;
JEGLINSKI, S ;
WEI, X ;
VARDENY, ZV ;
KWOCK, EW ;
MILLER, TM .
PHYSICAL REVIEW B, 1994, 50 (19) :14702-14705
[2]   Optical response of conjugated polymers excited at high intensity [J].
Denton, GJ ;
Tessler, N ;
Stevens, MA ;
Friend, RH .
SYNTHETIC METALS, 1999, 102 (1-3) :1008-1009
[3]   INFRARED ACTIVITY OF PEIERLS SYSTEMS AND APPLICATION TO POLYACETYLENE [J].
HOROVITZ, B .
SOLID STATE COMMUNICATIONS, 1982, 41 (10) :729-734
[4]   Charge separation in localized and delocalized electronic states in polymeric semiconductors [J].
Köhler, A ;
dos Santos, DA ;
Beljonne, D ;
Shuai, Z ;
Brédas, JL ;
Holmes, AB ;
Kraus, A ;
Müllen, K ;
Friend, RH .
NATURE, 1998, 392 (6679) :903-906
[5]  
MCGEHEE MD, 1999, ADV SYNTHETIC METALS, P98
[6]   Picoseconds time resolved photoinduced absorption by infrared active vibrations as a probe for charge photogeneration in MEH-PPV/C60 composites [J].
Mizrahi, U ;
Shtrichman, I ;
Gershoni, D ;
Ehrenfreund, E ;
Vardeny, ZV .
SYNTHETIC METALS, 1999, 102 (1-3) :1182-1185
[7]   Ultrafast photoinduced charge generation in conjugated polymers [J].
Moses, D ;
Dogariu, A ;
Heeger, AJ .
CHEMICAL PHYSICS LETTERS, 2000, 316 (5-6) :356-360
[8]   PHOTOINDUCED ELECTRON-TRANSFER FROM A CONDUCTING POLYMER TO BUCKMINSTERFULLERENE [J].
SARICIFTCI, NS ;
SMILOWITZ, L ;
HEEGER, AJ ;
WUDL, F .
SCIENCE, 1992, 258 (5087) :1474-1476
[9]  
SARICIFTCI NS, 1997, NATURE PHOTOEXCITATI
[10]  
SILVA C, IN PRESS SYNTH MET