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Two dimensional Langevin recombination in regioregular poly(3-hexylthiophene)
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FIG. 1.

(a) Simulated DoI current transients in the case of 3D Langevin recombination (1) and 2D Langevin recombination for [(2) , (3) and , (4) and ]; time scale is normalized to the faster charge carriers transit time and current is normalized to space charge limited current of faster charge carriers. (b) Solid lines—experimental DoI transients in RRP3HT:PCBM bulk heterojunction and structures; dashed line—numerically calculated DoI current transient for RRP3HT:PCBM structure .

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FIG. 2.

(a) Charge carriers extraction observed by the integral TOF method in [(1) drift current of the small charge and (2) photocurrent saturated on light intensity]; RRP3HT:PCBM bulk heterojunction [(3) drift current of the small charge and (4) photocurrent saturated on light intensity]. Estimation of extraction time is indicated. (b) Extraction time dependence on the extraction current density in RRP3HT:PCBM bulk heterojunction and structures.

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FIG. 3.

Temperature dependence of the 2D Langevin recombination parameter .

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/content/aip/journal/apl/95/1/10.1063/1.3141513
2009-07-07
2014-04-18

Abstract

In this work, it is shown that recombination in regioregular poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (RRP3HT:PCBM) bulk-heterojunction solar cells is caused by the two dimensional (2D) Langevin recombination in the lamellar structures of RRP3HT, which are formed after annealing process. Due to 2D Langevin process, bimolecular recombination coefficient is reduced in comparison with three dimensional Langevin case, and bimolecular recombination coefficient depends on the density of charge carriers. Data obtained from the different experimental techniques (charge extraction with linearly increasing voltage, integral time of flight, double injection current transients and transient absorption spectroscopy) confirms 2D Langevin recombination in RR3PHT.

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Scitation: Two dimensional Langevin recombination in regioregular poly(3-hexylthiophene)
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/1/10.1063/1.3141513
10.1063/1.3141513
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