Journal
POLYMER
Volume 55, Issue 19, Pages 4884-4889Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2014.07.051
Keywords
Organic solar cells; X-ray scattering; Bulk heterojunction
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Funding
- DOE, OS, BES, MSE [DE-FG02-98ER45737]
- DOE [DE-AC02-05CH1123]
- Office of Naval Research [N000141110235]
- NSF CAREER [DMR-0954280]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0954280] Funding Source: National Science Foundation
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Molecular miscibility is a defining property of mixtures of electron-donating polymers and electron-accepting fullerenes used in the photoactive layer of bulk heterojunction (BHJ) organic solar cells. Even though miscibility of fullerene in the polymer is a commonly observed property, quantitative measurements have unknown connections with other morphological properties such as domain size and domain purity. By varying the amount of fullerene loading in BHJ thin films, we show that morphological properties are related to miscibility via straightforward relationships. In particular, miscibility influences the sensitivity of domain spacing to fullerene loading and determines the domain volume fractions and the residual fullerene content in the mixed polymer-rich phase in devices. Not only does this work show the relationships between miscibility and morphology, but it also highlights the general importance in determining miscibility levels in BHJ systems in order to target optimum morphologies and domain purities. (C) 2014 Elsevier Ltd. All rights reserved.
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