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On the complex refr...
On the complex refractive index of polymer:fullerene photovoltaic blends
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- Campoy-Quiles, M. (author)
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC),Institute of Material Science of Barcelona (ICMAB),ICMAB CSIC, Spain
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- Müller, Christian, 1980 (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan,ICMAB CSIC, Spain
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- Garriga, M. (author)
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC),Institute of Material Science of Barcelona (ICMAB),ICMAB CSIC, Spain
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- Wang, Ergang, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers, Sweden
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- Inganäs, Olle (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
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- Alonso, Isabel (author)
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC),Institute of Material Science of Barcelona (ICMAB),ICMAB CSIC, Spain
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(creator_code:org_t)
- Elsevier BV, 2014
- 2014
- English.
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In: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 571:P3, s. 371-376
- Related links:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present a detailed investigation of the refractive index of polymer:fullerene blends for photovoltaic applications. The donor polymers poly[2,7-(9,9-dioctylfluorene)-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] (APFO3), poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1), and poly[2,7-(9,9-dioctylfluorene)-alt-5,5-(5,10-di-2-thienyl-2,3,7,8-tetraphenyl-pyrazino[2,3-g]quinoxaline)] (APFO-Green9) were blended with either [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). We measured variable angle spectroscopic ellipsometry for three systems, namely APFO3:PCBM, TQ1:PC71BM and APFO-Green9:PC71BM, as a function of composition and analyze the data employing a number of models. We found that Bruggeman effective medium approximations (EMA) are not precise for the description of the optical properties of these blends. This is due to a number of reasons. First, we find that there are energy shifts associated to changes in conjugation length that cannot be accounted for using EMA. Second, blending results in a strong reduction of anisotropy. Finally, our data suggest that there is some degree of vertical segregation between components. Therefore, our results support the idea that the optical properties of polymer:fullerene mixtures should be treated as alloys rather than non-interacting blends.
Subject headings
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Keyword
- Bulk heterojunction; Organic solar cells; Effective medium approximation; Anisotropy; Vertical segregation; Ellipsometry
Publication and Content Type
- art (subject category)
- ref (subject category)
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