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Surface and Interfacial Morphology of Bulk Heterojunction Layers in Organic Solar Cells with Solvent Additive

Title
Surface and Interfacial Morphology of Bulk Heterojunction Layers in Organic Solar Cells with Solvent Additive
Authors
Kim A.Lee J.Carnis J.An G.Kang J.Kim H.Kim J.Shin T.J.Kim B.S.
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2019
Journal Title
Journal of the Korean Physical Society
ISSN
0374-4884JCR Link
Citation
Journal of the Korean Physical Society vol. 75, no. 7, pp. 498 - 502
Keywords
Bulk heterojunctionOrganic solar cellSurface and interfaceX-ray reflectivityX-ray scattering
Publisher
Korean Physical Society
Indexed
SCIE; SCOPUS; KCI scopus
Document Type
Article
Abstract
We study the surface and interfacial morphology of a bulk heterojunction (BHJ) layer with the solvent additive effect by using the X-ray reflectivity and the grazing incidence X-ray scattering techniques. The BHJ layer consists of poly(4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophene-4,6-diyl) (PTB7) and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) deposited on a poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) coated Si substrate. An interfacial layer with a low electron density is observed between the BHJ and PEDOT:PSS layers, which becomes less distinct when the additive 1,8-diiodooctane (DIO) is added to the film processing solvent. This result indicates that DIO causes PC71BM to become more uniformly distributed throughout the entire BHJ layer. The surface roughness of the BHJ significantly decreases with increasing addition of DIO. The understanding of the surface and interfacial morphology gives an important clue to improving the structures and efficiency. © 2019, The Korean Physical Society.
DOI
10.3938/jkps.75.498
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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