Degradation of Poly(3-hexylthiophene):Methano-Fullerene [6,6]-Phenyl-C71 Butyric Acid Methyl Ester Bulk Heterojunction Solar Cells and Annealing Effect on the Degraded Devices

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We have studied the degradation of poly(3-hexylthiophene):methano-fullerene [6,6]-phenyl-C71 butyric acid methyl ester (P3HT:PC71BM) bulk heterojunction BHJ solar cells and the annealing effect on the degraded devices. Firstly, the modification of electrical properties of the BHJ solar cells was monitored as a function of illumination time. The degradation of BHJ solar cell is dominated by the filling factor reduction and an irradiation to the solar cell accelerates the gradual degradation. Secondly, we found that inserting LiF between Al cathode and active layer, alleviating degradation, improves the device properties of the solar cell as well as its stability. Moreover, annealing on the degraded device helps partially recover the properties of the solar cell and the diode function. We speculated that this partial recovery caused by annealing is attributed to the rearrangement of P3HT as well as the aggregation of PC71BM. (c) 2011 The Japan Society of Applied Physics
Publisher
JAPAN SOC APPLIED PHYSICS
Issue Date
2011-01
Language
English
Article Type
Article
Keywords

DONOR-ACCEPTOR-HETEROJUNCTIONS; POLYMER; PERFORMANCE

Citation

JAPANESE JOURNAL OF APPLIED PHYSICS, v.50, no.1

ISSN
0021-4922
DOI
10.1143/JJAP.50.011601
URI
http://hdl.handle.net/10203/96831
Appears in Collection
PH-Journal Papers(저널논문)
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