Efficient bilayer heterojunction polymer solar cells with bumpy donor-acceptor interface formed by facile polymer blend
- Title
- Efficient bilayer heterojunction polymer solar cells with bumpy donor-acceptor interface formed by facile polymer blend
- Author
- 김태환
- Keywords
- Bilayer polymer solar cells; Nanostructure; Polymer blend; Phase separation
- Issue Date
- 2012-11
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- Organic Electronics, Nov 2012, 13(11), P.2688-2695
- Abstract
- We demonstrated a facile method for the fabrication of bilayer polymer solar cells with a controlled heterojunction structure via simple polymer blends. The spontaneous phase separation of poly(3-hexylthiophene)/polyethylene glycol blends provides a bumpy electron-donor layer with characteristic circular depressions. The diameter and depth of the circular depressions can be controlled by varying the PEG content of the blend. The deposition of [6,6]-phenyl-C61-butyric acid methyl ester as an electron-acceptor layer then creates an interpenetrating donor-acceptor interface for bilayer heterojunction polymer solar cells. The bumpy morphology of the interface results in a significant enhancement in the power conversion efficiency over that of the bilayer polymer solar cells with a typical planar interface, which is mainly due to an increase of photocurrent. An estimation of the field-dependent possibility of charge separation indicates that charge extraction is more efficient than charge recombination in the bilayer devices and the increase in the interfacial area of solar cells with a bumpy-interface leads to generate more electron-hole pairs at the interface. (C) 2012 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S1566119912003655?via%3Dihubhttp://hdl.handle.net/20.500.11754/47171
- ISSN
- 1566-1199
- DOI
- 10.1016/j.orgel.2012.07.040
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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