Efficient charge collection in hybrid polymer/ TiO2 solar cells using poly(ethylenedioxythiophene)/polystyrene sulphonate as hole collector

P. Ravirajan, D. D.C. Bradley, J. Nelson, S. A. Haque, J. R. Durrant, H. J.P. Smit, J. M. Kroon

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Abstract

We report a study of the optimization of power conversion efficiency in hybrid solar cells based on nanostructured titanium dioxide and a poly[2-(2-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) based conjugated polymer. Charge collection efficiency is enhanced by introducing a poly(ethylenedioxythiophene)/polystyrene sulphonate (PEDOT) layer (under the gold electrode) as the hole collector. Device performance is maximized for a device with a net active layer thickness of 100 nm. The optimized device has peak external quantum efficiencies ≈40% at the polymer's maximum absorption wavelength and yield short circuit current density ≥2 mA cm-2 for air mass (AM) 1.5 conditions (100 mW cm-2, 1 sun). The AM 1.5 open circuit voltage for this device is 0.64 V and the fill factor is 0.43, resulting in an overall power conversion efficiency of 0.58%. © 2005 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Volume86
Issue number14
DOIs
StatePublished - Apr 4 2005
Externally publishedYes

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