Charge transport dynamics of polymer solar cells under operating conditions: Influence of trap filling

McNeill, Christopher R.; Greenham, Neil C.
November 2008
Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p203310
Academic Journal
The authors report time-of-flight measurements on photovoltaic blends of poly(3-hexylthiophene) and poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2′,2″-diyl) (F8TBT). Through the use of an additional illumination source to provide a background current density, the influence of the charge density and trap population on hole and electron dynamics is studied. For holes, little change in the transit time is observed with this background illumination, whereas for electrons, a clear electron transient is observed with background illumination that is not observed without. Under solar illumination the electron trap states are sufficiently populated such that charge transport in all-polymer blends may not be as unbalanced as previously thought.


Related Articles

  • Hybrid solar cells with vertically aligned CdTe nanorods and a conjugated polymer. Yoonmook Kang; Nam-Gyu Park; Donghwan Kim // Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p113101 

    Vertically aligned CdTe nanorods were fabricated by electrodeposition and were applied for the active layer of solar cells after being combined with poly(3-octylthiophene) (P3OT), a conjugated polymer. The electrodeposited CdTe showed an n-type behavior with the electric resistivity and the...

  • Thermal ideality factor of hydrogenated amorphous silicon p-i-n solar cells. Kind, R.; van Swaaij, R. A. C. M. M.; Rubinelli, F. A.; Solntsev, S.; Zeman, M. // Journal of Applied Physics;Nov2011, Vol. 110 Issue 10, p104512 

    The performance of hydrogenated amorphous silicon (a-Si:H) p-i-n solar cells is limited, as they contain a relatively high concentration of defects. The dark current voltage (JV) characteristics at low forward voltages of these devices are dominated by recombination processes. The recombination...

  • Dye-sensitized solar cells with modified TiO2 surface chemical states: The role of Ti3+. Yu, Yang; Wu, Kunjie; Wang, Deliang // Applied Physics Letters;11/7/2011, Vol. 99 Issue 19, p192104 

    Dye-sensitized solar cells (DSSCs) with TiO2 electrodes, which were modified to have different surface chemical states, were fabricated. The DSSCs had an ultra-flat TiO2 electrode, on which only a mono-layer dye was attached. The cell I-V measurement showed that Ti3+ ion had a dramatic effect on...

  • Charge dissociation in polymer:fullerene bulk heterojunction solar cells with enhanced permittivity. Lenes, M.; Kooistra, F. B.; Hummelen, J. C.; Van Severen, I.; Lutsen, L.; Vanderzande, D.; Cleij, T. J.; Blom, P. W. M. // Journal of Applied Physics;Dec2008, Vol. 104 Issue 11, p114517 

    The dissociation efficiency of bound electron-hole pairs at the donor-acceptor interface in bulk heterojunction solar cells is partly limited due to the low dielectric constant of the polymer:fullerene blend. We investigate the photocurrent generation in blends consisting of a fullerene...

  • Implication of device functioning due to back reaction of electrons via the conducting glass substrate in dye sensitized solar cells. Hore, Sarmimala; Kern, Rainer // Applied Physics Letters;12/26/2005, Vol. 87 Issue 26, p263504 

    Enhanced efficiency of dye sensitized solar cells requires minimization of all electron losses in the device. In addition to the loss via the nanoparticles of TiO2, the loss via the surface of the conducting glass substrate (TCO) needs to be contained. This additional electron recombination...

  • Enhanced charge separation in chlorophyll a solar cell by gold nanoparticles. Barazzouk, Saïd; Hotchandani, Surat // Journal of Applied Physics;12/15/2004, Vol. 96 Issue 12, p7744 

    An efficient organic photoelectrochemical cell based on chlorophyll a (Chla) and gold nanoparticles is constructed. The enhanced performance of this cell is due to the beneficial role of gold nanoparticles in accepting and shuttling the photogenerated electrons in Chla to the collecting...

  • Solar energetic particle propagation in 1997–99: Observations from ACE, Ulysses, and Voyagers 1 and 2. Decker, R. B.; Roelof, E. C.; Krimigis, S. M. // AIP Conference Proceedings;2000, Vol. 528 Issue 1, p161 

    Solar energetic particles injected during intense activity in April-May 1998 and observed at ACE and Ulysses are identified in 0.5-1.5 MeV proton data from the LECP instrument on Voyager 2 (56 AU, 20°S) and Voyager 1 (72 AU, 33°N). A shell of ≈1 MeV protons ∼60 days wide reached...

  • Survey of ionic charge states of solar energetic particle events during the first year of ACE. Mo¨bius, E.; Klecker, B.; Popecki, M. A.; Morris, D.; Mason, G. M.; Stone, E. C.; Bogdanov, A. T.; Dwyer, J. R.; Galvin, A. B.; Heirtzler, D.; Hovestadt, D.; Kistler, L. M.; Siren, C. // AIP Conference Proceedings;2000, Vol. 528 Issue 1, p131 

    The ionic charge state distributions of solar energetic particle events are determined with ACE SEPICA on an event by event basis, over the time period from launch through the end of 1998. Because of the large geometric factor of SEPICA the observations can be extended to events with very low...

  • Variable fractionation of solar energetic particles according to first ionization potential. Mewaldt, R. A.; Cohen, C. M. S.; Leske, R. A.; Christian, E. R.; Cummings, A. C.; Slocum, P. L.; Stone, E. C.; von Rosenvinge, T. T.; Wiedenbeck, M. E. // AIP Conference Proceedings;2000, Vol. 528 Issue 1, p123 

    The average composition of solar energetic particles (SEPs), like the solar corona, is known to be depleted in elements with first ionization potential (FIP) more than ∼10 eV by a factor of approximately four. We examine evidence for event to event variations in the FIP-related...


Read the Article


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

Try another library?
Sign out of this library

Other Topics