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Nanoscale. 2014 Mar 7;6(5):2847-54. doi: 10.1039/c3nr05538h. Epub 2014 Jan 27.

Preparation of PCDTBT nanofibers with a diameter of 20 nm and their application to air-processed organic solar cells.

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1
Carbon Nanomaterials Design Laboratory, Global Research Laboratory (GRL), Research Institute of Advanced Materials (RIAM), and Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea. crpark@snu.ac.kr.

Abstract

A strategy for fabricating organic photovoltaic (OPV) devices based on PCDTBT nanofibers and PC70BM is described. Electrospinning techniques are used to prepare PCDTBT nanofibers and OPV devices in ambient air. The diameters of the PCDTBT nanofibers are approximately twice the exciton diffusion length, 20 nm. The active layer exhibits 100% photoluminescence quenching due to the small nanofiber diameter, indicating that the excitons are efficiently dissociated. The electrospun PCDTBT nanofibers absorb more photons at longer wavelengths, leading to improved photon harvesting. OPV devices composed of PCDTBT nanofibers show a high short circuit current of 11.54 mA cm(-2) and a high power conversion efficiency of 5.82%. The increase in the short circuit current is attributed to enhanced photon harvesting and charge transport. This method may be applied to the fabrication, in ambient air, of large-area active layers composed of other new conjugated polymers to yield high-performance OPV devices.

PMID:
24469012
DOI:
10.1039/c3nr05538h
[Indexed for MEDLINE]
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