Christoph Brabec, Vladimir Dyakonov, Jan Cornelius Hummelen, Rene A. J. Janssen, Serdar Niyazi Sariciftci, Markus Clark Scharber, G. Zoriniants,
"Photoinduced Charge Carriers in Conjugated Polymer-Fullerene Composites Studied with Light-Induced Electron Spin Resonance"
, in Physical Review B , 10-1999, ISSN: 0163-1829, Photoinduced Charge Carriers in Conjugated Polymer-Fullerene Composites Studied with Light-Induced Electron Spin Resonance (LESR), V. Dyakonov, G. Zoriniants, M. Scharber, C. J. Brabec, R. A. J. Janssen, J. C. Hummelen and N. S. Sariciftci, Phys. Rev. B 59/12 (1999) 8019-8025
Original Titel:
Photoinduced Charge Carriers in Conjugated Polymer-Fullerene Composites Studied with Light-Induced Electron Spin Resonance
Sprache des Titels:
Englisch
Original Kurzfassung:
Detailed studies on photoinduced spins in conjugated polymer/fullerene composites using (cw) light-induced electron-spin-resonance (LESR) technique are reported. Two overlapping LESR lines are observed, from positive polarons on the polymer chains and negative charges on the
fullerene moieties. Microwave power saturation studies show different relaxation times for these two spins, ruling out spin-exchange correlations, giving clear evidence of independent spins. The unusually high relaxation rate of the fullerene monoanionic spins is of intrinsic origin, and discussed in terms of a splitting of the T (1u) level by a Jahn-Teller-type distortion as proposed in the literature. Further, we observed two distinct contributions to LESR signals: a prompt one and a
persistent one. The excitation light intensity dependence of the prompt contributions into the P+ and C(60) - ESR signals is of bimolecular type (I^ 0.5 ), and implies mutual annihilation within the created ( P+...C(60)-) pair. The persistent contribution is found to be excitation intensity independent, and is proposed to originate from deep traps due to disorder. [S0163-1829(99)0112-X]
Sprache der Kurzfassung:
Englisch
Journal:
Physical Review B
Erscheinungsmonat:
10
Erscheinungsjahr:
1999
Notiz zum Zitat:
Photoinduced Charge Carriers in Conjugated Polymer-Fullerene Composites Studied with Light-Induced Electron Spin Resonance (LESR), V. Dyakonov, G. Zoriniants, M. Scharber, C. J. Brabec, R. A. J. Janssen, J. C. Hummelen and N. S. Sariciftci, Phys. Rev. B 59/12 (1999) 8019-8025
Forschungs-