Electromodulation of photoinduced charge transfer in polyfluorene bilayer devices

Dhoot, A. S.; Hogan, J. A.; Morteani, A. C.; Greenham, N. C.
September 2004
Applied Physics Letters;9/20/2004, Vol. 85 Issue 12, p2256
Academic Journal
Photoinduced charge transfer at a conjugated polymer donor-acceptor heterojunction controls the ultimate photogeneration efficiency in photovoltaic devices. We have studied this charge transfer by measurements of electric-field-induced photoluminescence (PL) modulation in polyfluorene-based bilayer devices at room and low temperatures. Depending on the field direction across the interface we observe field-induced quenching or enhancement of the PL, which we ascribe to modulation of the exciton dissociation rate through modification of the energy of the charge-transfer state formed after charge separation.


Related Articles

  • Charge transfer efficiency in hybrid bulk heterojunction composites. Kucur, Erol; Riegler, Jürgen; Urban, Gerald; Nann, Thomas // Journal of Chemical Physics;7/8/2004, Vol. 121 Issue 2, p1074 

    On the basis of recently published electrochemical measurements, the charge transfer efficiency within CdSe nanocrystal/conducting polymer heterojunction composites was investigated by means of luminescence interaction strength. It was found that...

  • Strong red emission in heterojunctions of conjugated polymer blends. Li, Zong-Long; Meng, Hsin-Fei; Horng, Sheng-Fu; Hsu, Chain-Shu; Chen, Lal-Cheng; Chang, Shu-Mel // Applied Physics Letters;6/14/2004, Vol. 84 Issue 24, p4944 

    We demonstrate strong red electroluminescence in bilayer polymer light-emitting diodes with poly(3-hexylthiophene) and polyfluorene copolymers. The emission spectrum of the diode, peaked at 612 nm, is different from either of the two polymer layers, and is attributed to the exciplex state...

  • Low Temperature Charge Transport Study in Polypyrrole. Taunk, Manish; Chand, Subhash // AIP Conference Proceedings;12/12/2011, Vol. 1393 Issue 1, p265 

    Organic polymers were usually considered as electrical insulators but due to the extended π-backbone system a new class of electrically conductive organic polymers is possible. These π conjugated polymers have various remarkable properties which leads to their probable use in variety of...

  • Multi-barrier field-emission behavior in PBTTT thin films at low temperatures. Kang, Evan S. H.; Kim, Eunseong // Scientific Reports;2/13/2015, p8396 

    We investigated the low-temperature transport mechanism for poly[2,5-bis(3-alkylthiophen-2-yl)thieno(3,2-b)thiophene] (PBTTT). The temperature-dependent transport behavior was studied by varying the drain-source electric field and gate bias. The results suggest that low-temperature charge...

  • Photoinduced Absorption and Charge Transfer in Semiconducting Polymers. Chapron, David; Nunzi, Jean-Michel; Aldea, Gabriela; Cousseau, Jack // Nonlinear Optics, Quantum Optics: Concepts in Modern Optics;2007, Vol. 37 Issue 1-3, p227 

    We present a study of photoinduced excited states and the effects on optical properties of charge transfer from donor-type semiconducting conjugated polymers to acceptor as C60-derivatives for two different systems insolution: poly(2-methoxy-5-(2'-ethylhexyloxy)- 1, 4-phenylenevinylene)...

  • Lifetime determination of fluorescence and phosphorescence of a series of oligofluorenes. Chunyan Chi; Chan Im; Wegner, Gerhard // Journal of Chemical Physics;1/14/2006, Vol. 124 Issue 2, p024907 

    The photoluminescence (PL) properties of oligofluorenes with 2-ethylhexyl group in 9, 9′ position in solution and as thin films were investigated by time-resolved techniques at both room temperature and 77 K. The fluorescence lifetimes of the oligomers decrease with chain length. The...

  • Tuning the electronic structures and optical properties of fluorene-based donor-acceptor copolymers by changing the acceptors: a theoretical study. Wang, Yanling; Peng, Qiang; Hou, Qiufei; Zhao, Kun; Liang, Ying; Li, Benlin // Theoretical Chemistry Accounts: Theory, Computation, & Modeling;Jun2011, Vol. 129 Issue 2, p257 

    Five fluorene-based conjugated copolymers were studied to explore the effect of acceptor on the electronic and optical properties. Their ground-state, excited-state electronic structures and the tunable optical properties were theoretically investigated using density functional theory (DFT) and...

  • Theoretical studies of the effect of electron-withdrawing dicyanovinyl group on the electronic and charge-transport properties of fluorene-thiophene oligomers. Wu, Qing-Xiu; Geng, Yun; Liao, Yi; Tang, Xiao-Dan; Yang, Guo-Chun; Su, Zhong-Min // Theoretical Chemistry Accounts: Theory, Computation, & Modeling;Mar2012, Vol. 131 Issue 3, p1 

    At the quantum-chemical level, we characterize some important parameters that control photoelectronic properties of three π-conjugated fluorene-thiophene oligomers namely, 2,7-di(2-thienyl)-9,9-dihexylfluorene, 2,5-Bis-(9H-fluorene-2-yl)-thieno[3,2-b]thiophene and...

  • Influence of polymer coating on the low-temperature photoluminescence properties of ZnO nanowires. Richters, Jan-Peter; Voss, Tobias; Wischmeier, Lars; Rückmann, Ilja; Gutowski, Jürgen // Applied Physics Letters;1/7/2008, Vol. 92 Issue 1, p011103 

    We report on low temperature photoluminescence studies of ZnO nanowires embedded in different polymers. Comparing the spectra of as-grown and embedded ZnO nanowires, we find a decrease of the deep-level emission and an increase of the near band-edge emission after the embedding process. The near...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics