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Investigation into the Thermal Annealing Effect on the Photovoltaic Properties of Organic Solar Cells based on CuPc/C60 Heterojunctions
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- Authors
- Issue Date
- 2008
- Publisher
- 한국물리학회 = The Korean Physical Society
- Citation
- J. Korean Phys. Soc. 53, 1551
- Keywords
- Organic solar cells ; CuPc ; C60 ; BCP ; Thermal annealing
- Abstract
- We studied the effect of post-annealing treatment on the photovoltaic (PV) properties of or-
ganic solar cells based on copper phthalocyanine (CuPc)/fullerene (C60) heterojunctions. In the
device structure of ITO/CuPc (30 nm)/C60(40 nm)/BCP(10 nm)/LiF(0.5 nm)/Al, where BCP
is 2,9-dimethyl-4,7-diphenyl-phenanthroline acting as an exciton blocking layer, a maximum power
conversion effciency (np) of about 1 % under an AM 1.5 solar illumination intensity of 100 mW/cm2
was obtained at room temperature. By measuring the PV characteristics for the devices annealed at
various temperatures for 30 minutes, we found that the short-circuit current and e ciency increased
with increasing annealing temperature up to 100 C (np 1:3 %) and then decreased at higher
temperatures. We analyzed the effect of thermal annealing on the improved device performance by
measuring the optical absorption spectra and the X-ray diffraction patterns of the CuPc/C60 films.
- ISSN
- 0374-4884 (Print)
1976-8524 (Online)
- Language
- English
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