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Volumn 130, Issue 24, 2008, Pages 7721-7735

Compositional and electric field dependence of the dissociation of charge transfer excitons in alternating polyfluorene copolymer/fullerene blends

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; ABSORPTION SPECTROSCOPY; ASTROPHYSICS; CHARGE TRANSFER; CHARGED PARTICLES; DISSOCIATION; ELECTRIC FIELD EFFECTS; ELECTRIC FIELD MEASUREMENT; ELECTRIC FIELDS; ELECTRIC INSTRUMENT TRANSFORMERS; ELECTROACUPUNCTURE; ELECTROMAGNETIC FIELD THEORY; ELECTROMAGNETIC FIELDS; ELECTROMAGNETISM; ELECTRON MICROSCOPES; ELECTRON MICROSCOPY; ELECTRON OPTICS; ELECTRONS; EMISSION SPECTROSCOPY; FULLERENES; IMAGING TECHNIQUES; ION EXCHANGE; LIGHT EMISSION; LUMINESCENCE; MAGNETISM; MASS TRANSFER; MICROSCOPIC EXAMINATION; OPTICAL PROPERTIES; POLYMERS; SEMICONDUCTING CADMIUM TELLURIDE; THICK FILMS; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY;

EID: 45249122965     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja8012598     Document Type: Article
Times cited : (550)

References (119)
  • 60
    • 76249105699 scopus 로고    scopus 로고
    • De, S.;Kesti, T.;Maiti, M.;Zhang, F.;Inganäs, O.;Yartsev, A.;Pascher, T.;Sundström, V. Chem. Phys., published online December, 8, 2007, doi:10.1016/j.chemphys.2007.11.018.
    • De, S.;Kesti, T.;Maiti, M.;Zhang, F.;Inganäs, O.;Yartsev, A.;Pascher, T.;Sundström, V. Chem. Phys., published online December, 8, 2007, doi:10.1016/j.chemphys.2007.11.018.
  • 69
    • 45249086777 scopus 로고    scopus 로고
    • 2 = 3.4 is derived from the value of n = 1.85 for PF8TBT (ref 36) and PF10TBT (ref 28) when extrapolated to ω = 0.
    • 2 = 3.4 is derived from the value of n = 1.85 for PF8TBT (ref 36) and PF10TBT (ref 28) when extrapolated to ω = 0.
  • 70
    • 45249097983 scopus 로고    scopus 로고
    • r〉 = 3.85 (80 wt % PCBM).
    • r〉 = 3.85 (80 wt % PCBM).
  • 87
    • 45249084965 scopus 로고    scopus 로고
    • In mixtures in toluene the triplet exciton of tetraphenylporphine (H2TPP, E(T1, 1.43 eV, ref 45) is in equilibrium with that of PF10TBT upon the addition of PF10TBT, whereas that of tetracene (E(T 1, 1.27 eV, ref 45) quenches the triplet exciton of PF10TBT. We expect the energy of the PF10TBT triplet to change minimally upon going from solution to the solid state as the energetic position of the singlet exciton also hardly shifts both in absorption and in emission
    • 1) = 1.27 eV, ref 45) quenches the triplet exciton of PF10TBT. We expect the energy of the PF10TBT triplet to change minimally upon going from solution to the solid state as the energetic position of the singlet exciton also hardly shifts (both in absorption and in emission).
  • 89
    • 45249084282 scopus 로고    scopus 로고
    • At 80 K a decay time of τ, 10-15 μs was determined for a thin film of PF10TBT over the full spectrum see Supporting Information, Figure S5, At 290 K the decay time of the triplet exciton is within the time response of our setup; however, the 10-fold reduction in intensity infers a decay time of about 1 μs
    • At 80 K a decay time of τ = 10-15 μs was determined for a thin film of PF10TBT over the full spectrum (see Supporting Information, Figure S5). At 290 K the decay time of the triplet exciton is within the time response of our setup; however, the 10-fold reduction in intensity infers a decay time of about 1 μs.
  • 90
    • 45249095556 scopus 로고    scopus 로고
    • There are two strong indications that the PF10TBT radical cation is the only significant contributor to the photoinduced absorption spectrum of the PF10TBT:PCBM 1:4 blend at 290 K: (1) an identical spectrum is found for a blend of PF10TBT with TCAQ (a stronger electron acceptor) at 290 K (Supporting Information, Figure S4), and (2) fits of the frequency dependence resulted in exactly the same lifetime (υ = 25-30 μs) at 0.48, 1.30, and 1.70 eV. If the triplet absorption would substantially (> 10%) contribute to the spectrum, the decay time at the high energy band would be shorter.
    • There are two strong indications that the PF10TBT radical cation is the only significant contributor to the photoinduced absorption spectrum of the PF10TBT:PCBM 1:4 blend at 290 K: (1) an identical spectrum is found for a blend of PF10TBT with TCAQ (a stronger electron acceptor) at 290 K (Supporting Information, Figure S4), and (2) fits of the frequency dependence resulted in exactly the same lifetime (υ = 25-30 μs) at 0.48, 1.30, and 1.70 eV. If the triplet absorption would substantially (> 10%) contribute to the spectrum, the decay time at the high energy band would be shorter.
  • 106
    • 45249124463 scopus 로고    scopus 로고
    • -1 (pulse-radiolysis TRMC, ref 35).
    • -1 (pulse-radiolysis TRMC, ref 35).
  • 113
    • 45249120989 scopus 로고    scopus 로고
    • ph,max = 65% agrees with an IQE = 55-75% for this polymer blend (ref 28).
    • ph,max = 65% agrees with an IQE = 55-75% for this polymer blend (ref 28).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.