Efficient bilayer heterojunction polymer solar cells with bumpy donor-acceptor interface formed by facile polymer blend
- Authors
- Yang, Hee Yeon; Kang, Nam Su; Hong, Jae-Min; Song, Yong-Won; Kim, Tae Whan; Lim, Jung Ah
- Issue Date
- Nov-2012
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Bilayer polymer solar cells; Nanostructure; Polymer blend; Phase separation
- Citation
- ORGANIC ELECTRONICS, v.13, no.11, pp.2688 - 2695
- Indexed
- SCIE
SCOPUS
- Journal Title
- ORGANIC ELECTRONICS
- Volume
- 13
- Number
- 11
- Start Page
- 2688
- End Page
- 2695
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/164327
- DOI
- 10.1016/j.orgel.2012.07.040
- ISSN
- 1566-1199
- 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.
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