Efficient bilayer heterojunction polymer solar cells with bumpy donor-acceptor interface formed by facile polymer blend
- Efficient bilayer heterojunction polymer solar cells with bumpy donor-acceptor interface formed by facile polymer blend
- 양희연; 강남수; 홍재민; 송용원; 김태환; 임정아
- polymer solar cell; polymer blend; nanostructure; Bilayer polymer solar cells; Phase separation
- Issue Date
- Organic electronics
- VOL 13, NO 11, 2688-2695
- 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 electrondonor
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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