Xerographic study on a ladder-type poly(para-phenylene)

Pan, Junyou; Scherf, Ullrich; Schreiber, Andreas; Haarer, D.

doi:10.1063/1.480976

Cited by 21 publications

(10 citation statements)

References 27 publications

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“…The Onsager theory has been widely used to interpret experimental data on charge-carrier photogeneration in conjugated polymers and other disordered systems (Popovic and Menzel, 1979;Goliber and Perlstein, 1984;Barth and Ba¨ssler, 1997;Pan et al, 2000). In some cases the measured field-dependence of the photocurrent could be explained by the Onsager theory only when a large value of the initial charge separation distance was assumed.…”

Section: Resultsmentioning

confidence: 98%

Geminate charge recombination with distance-dependent intrinsic reaction rate: Escape probability and its electric field effect

Wojcik

Tachiya

2005

Radiation Physics and Chemistry

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Section: Resultsmentioning

confidence: 98%

Geminate charge recombination with distance-dependent intrinsic reaction rate: Escape probability and its electric field effect

Wojcik

Tachiya

2005

Radiation Physics and Chemistry

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“…͑28͒, has been frequently used to calculate the electric field dependence of the escape probability of charge carriers in photoionized systems. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Braun's approach is also based on the wrong assumption that both recombination and separation processes of a single pair of reactants can be described by first-order rate constants. It uses for k d ͑E͒ in Eq.…”

Section: ͑28͒mentioning

confidence: 99%

Accuracies of the empirical theories of the escape probability based on Eigen model and Braun model compared with the exact extension of Onsager theory

Wojcik

Tachiya

2009

The Journal of Chemical Physics

116

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This paper deals with the exact extension of the original Onsager theory of the escape probability to the case of finite recombination rate at nonzero reaction radius. The empirical theories based on the Eigen model and the Braun model, which are applicable in the absence and presence of an external electric field, respectively, are based on a wrong assumption that both recombination and separation processes in geminate recombination follow exponential kinetics. The accuracies of the empirical theories are examined against the exact extension of the Onsager theory. The Eigen model gives the escape probability in the absence of an electric field, which is different by a factor of 3 from the exact one. We have shown that this difference can be removed by operationally redefining the volume occupied by the dissociating partner before dissociation, which appears in the Eigen model as a parameter. The Braun model gives the escape probability in the presence of an electric field, which is significantly different from the exact one over the whole range of electric fields. Appropriate modification of the original Braun model removes the discrepancy at zero or low electric fields, but it does not affect the discrepancy at high electric fields. In all the above theories it is assumed that recombination takes place only at the reaction radius. The escape probability in the case when recombination takes place over a range of distances is also calculated and compared with that in the case of recombination only at the reaction radius.

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“…18 The dashed curve in Fig. 3͑a͒ has been calculated with the same parameters as for the fit of the bilayer device, namely, with the same built-in voltage but with a somehow lower value for k rec / k diss ͑0͒ of 25.…”

mentioning

confidence: 99%

Charge carrier generation and electron blocking at interlayers in polymer solar cells

Yin

Pieper

Stiller

et al. 2007

Applied Physics Letters

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The authors show that an electron-donating polymer interlayer and a spin coated layer of an electron-accepting polymer form a defined polymer-polymer heterojunction. Directional photoinduced charge transfer and efficient electron blocking at this heterojunction is clearly seen in Kelvin probe measurements. The photocurrent characteristics of this well-defined bilayer structure as well as of the respective blend device can be consistently fitted by models taking into account only the field dependence of charge carrier generation. Apparently, the efficiency to form free carriers is the determining process in both types of polymer-polymer solar cell structures.

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Xerographic study on a ladder-type poly(para-phenylene)

Cited by 21 publications

References 27 publications

Geminate charge recombination with distance-dependent intrinsic reaction rate: Escape probability and its electric field effect

Geminate charge recombination with distance-dependent intrinsic reaction rate: Escape probability and its electric field effect

Accuracies of the empirical theories of the escape probability based on Eigen model and Braun model compared with the exact extension of Onsager theory

Charge carrier generation and electron blocking at interlayers in polymer solar cells

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