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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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  • Synchrotron Radiation Application Researches

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

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Title
Surface and Interfacial Morphology of Bulk Heterojunction Layers in Organic Solar Cells with Solvent Additive
Author
Kim, AjeongLee, JihoCarnis, JeromeAn, GukilKang, JinbackKim, HyunjungKim, JisuShin, Tae JooKim, JinwooKim, BongSoo
Issue Date
2019-10
Publisher
한국물리학회
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.75, no.7, pp.498 - 502
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/30684
URL
https://link.springer.com/article/10.3938%2Fjkps.75.498
DOI
10.3938/jkps.75.498
ISSN
0374-4884
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UCRF_Journal Papers
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