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Measurement of Exciton Diffusion in a Well-Defined donor/acceptor Heterojunction Based on a Conjugated Polymer and Cross-Linked Fullerene Derivative

Measurement of Exciton Diffusion in a Well-Defined donor/acceptor Heterojunction Based on a Conjugated Polymer and Cross-Linked Fullerene Derivative

Yanbin Wang, Hiroaki Benten, Shunji Ohara, Daichi Kawamura, Hideo Ohkita, Shinzaburo Ito

ACS Appl Mater Interfaces. 2014 Aug 27;6(16):14108-15.

PMID: 25051391

Abstract:

We designed a well-defined donor/acceptor heterojunction for measuring exciton diffusion lengths in conjugated polymers. To obtain an insoluble electron acceptor layer, a new cross-linkable fullerene derivative (bis-PCBVB) was synthesized by functionalizing [6,6]-diphenyl-C62-bis(butyric acid methyl ester) (bis-PCBM) with two styryl groups. The spin-coated bis-PCBVB film was cross-linked in situ by heating at 170 °C for 60 min. Surface characterizations by UV-visible absorption, atomic force microscopy, and photoelectron yield spectroscopy revealed that a smooth and solvent-resistant film (p-PCBVB) was obtained. In bilayer films with a donor conjugated polymer, poly[2,7-(9,9-didodecylfluorene)-alt-5,5-(4',7'-bis(2-thienyl)-2',1',3'-benzothiadiazole)] (PF12TBT), spin-coated on top of the p-PCBVB acceptor layer, the photoluminescence (PL) of the PF12TBT was effectively quenched. This is because the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of the p-PCBVB film are nearly the same as those of the parent bis-PCBM spin-coated film. On the basis of the PL quenching results, the exciton diffusion length and exciton diffusion coefficient in the PF12TBT were evaluated to be 11 nm and 9.8 × 10(-4) cm(2) s(-1), respectively.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS71911	[6.6] Diphenyl C62 bis(butyric acid methyl ester)(mixture of isomers)			Price

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