Diffusion-limited recombination in polymer-fullerene blends and its influence on photocurrent collection

被引:347
|
作者
Nelson, J [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Phys, Ctr Elect Mat & Devices, London SW7 2BW, England
来源
PHYSICAL REVIEW B | 2003年 / 67卷 / 15期
关键词
D O I
10.1103/PhysRevB.67.155209
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We propose a model of charge recombination in interpenetrating two-phase systems, and apply it to blends of poly [2-methoxy-5-(3',7'-dimethyloctyloxy)-1-4-phenylene vinylene], (MDMO-PPV) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C-61 (PCBM). The main features of the model are that charge recombination is rate limited by the diffusion of positive polarons towards PCBM anions; that the density of polaron states contains a tail of deep traps which serve to delay recombination; and that polarons move between localized states largely by means of thermally activated hopping. The model is implemented using Monte Carlo simulations and is applied to reproduce the observed dependence of charge recombination kinetics on laser intensity, temperature, and background illumination, detected by transient optical spectroscopy. Modeling the experimental data yields a density of deep localized states in MDMO-PPV of order 10(17) cm(-3), and a charge carrier lifetime of order 10 mus under solar illumination. An alternative model based on direct tunneling is ruled out by comparison with the observed temperature dependence. The recombination model is incorporated into a one-dimensional calculation of short-circuit photocurrent in a solar cell as a function of temperature and light intensity. We conclude that charge recombination is sufficiently slow not to limit photocurrent collection under solar intensities at short circuit, and propose that space charge effects may be responsible for the observed sensitivity of photocurrent to temperature.
引用
收藏
页数:10
相关论文
共 50 条
  • [31] Tuning organic magnetoresistance in polymer-fullerene blends by controlling spin reaction pathways
    Janssen, P.
    Cox, M.
    Wouters, S. H. W.
    Kemerink, M.
    Wienk, M. M.
    Koopmans, B.
    NATURE COMMUNICATIONS, 2013, 4
  • [32] Charge carrier concentration and temperature dependent recombination in polymer-fullerene solar cells
    Foertig, A.
    Baumann, A.
    Rauh, D.
    Dyakonov, V.
    Deibel, C.
    APPLIED PHYSICS LETTERS, 2009, 95 (05)
  • [33] THEORY OF DIFFUSION-LIMITED RECOMBINATION OF DONOR-ACCEPTOR PAIRS
    FABRIKANT, I
    KOTOMIN, E
    JOURNAL OF LUMINESCENCE, 1975, 9 (06) : 502 - 513
  • [34] Influence of particle size on diffusion-limited aggregation
    Tan, ZJ
    Zou, XW
    Zhang, WB
    Jin, ZZ
    PHYSICAL REVIEW E, 1999, 60 (05): : 6202 - 6205
  • [35] ADIABATIC LIOUVILLEAN IN THE THEORY OF DIFFUSION-LIMITED RECOMBINATION .1.
    RUDAVETS, MG
    RUDAVETS, AG
    JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1992, 25 (20): : 5283 - 5295
  • [36] Influence of external field on diffusion-limited aggregation
    Tan, ZJ
    Zou, XW
    Zhang, WB
    Jin, ZZ
    PHYSICS LETTERS A, 2000, 268 (1-2) : 112 - 116
  • [37] Influence of a Mesogenic Dendrimer on the Morphology of Polymer-Fullerene Composites for Photovoltaics
    Kasdorf, Olga
    Kitzerow, Heinz-Siegfried
    Lenoble-Zwahlen, Julie
    Deschenaux, Robert
    JAPANESE JOURNAL OF APPLIED PHYSICS, 2010, 49 (01)
  • [38] Resonance Raman spectroscopy and imaging of push-pull conjugated polymer-fullerene blends
    Martin, Eric J. J.
    Berube, Nicolas
    Provencher, Francoise
    Cote, Michel
    Silva, Carlos
    Doorn, Stephen K.
    Grey, John K.
    JOURNAL OF MATERIALS CHEMISTRY C, 2015, 3 (23) : 6058 - 6066
  • [39] Dynamics of Charge Generation and Transport in Polymer-Fullerene Blends Elucidated Using a PhotoFET Architecture
    Pandey, Ajay K.
    Aljada, Muhsen
    Pivrikas, Almantas
    Velusamy, Marappan
    Burn, Paul L.
    Meredith, Paul
    Namdas, Ebinazar B.
    ACS PHOTONICS, 2014, 1 (02): : 114 - 120
  • [40] Theory of interfacial charge-transfer complex photophysics in π-conjugated polymer-fullerene blends
    Aryanpour, K.
    Psiachos, D.
    Mazumdar, S.
    PHYSICAL REVIEW B, 2010, 81 (08)