Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/7693
Title: Organic photovoltaic devices based on blends of regioregular poly(3-hexylthiophene) and poly(9,9-dioctylfluorene-co-benzothiadiazole)
Authors: Choulis, Stelios A. 
Kim, Youngkyoo 
Cook, Steffan 
Major Field of Science: Engineering and Technology
Field Category: ENGINEERING AND TECHNOLOGY
Keywords: Photoelectric cells;Absorption spectroscopy;Photoluminescence;Film;Quantum chemistry
Issue Date: 15-Oct-2004
Source: Chemistry of materials, 2004, vol. 16, no. 23, pp. 4812-4818
Volume: 16
Issue: 23
Start page: 4812
End page: 4818
Journal: Chemistry of materials 
Abstract: We have fabricated organic photovoltaic devices with blends of regioregular poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) as an electron donor and an electron acceptor, respectively. Several fabrication parameters such as blend composition, film thickness, solvent, and presence of LiF layer were varied in order to find the maximum device performance. The highest external quantum and power conversion efficiencies were achieved for the blend film with 60 wt % P3HT using p-xylene as a solvent. Insertion of a LiF layer further improved the power conversion efficiency from 0.02% to 0.13% under AM1.5 condition (1 Sun). To understand the relatively poor efficiency even in the optimized device, this polymer blend system was analyzed in relation to the following factors: charge separation efficiency, as measured by photoluminescence quantum efficiency; charge carrier mobility, measured by time-of-flight; and charge recombination dynamics, measured by transient absorption spectroscopy. The results showed that the electron mobility of F8BT is responsible mainly for the low efficiency in the presence of minor contribution of the charge separation efficiency
ISSN: 1520-5002
DOI: 10.1021/cm049585c
Rights: © American Chemical Society
Attribution-NonCommercial-NoDerivs 3.0 United States
Type: Article
Affiliation: Imperial College London 
Affiliation : Imperial College London 
Appears in Collections:Άρθρα/Articles

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