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Effective protection of sequential solution-processed polymer/fullerene bilayer solar cell against charge recombination and degradation

Title
Effective protection of sequential solution-processed polymer/fullerene bilayer solar cell against charge recombination and degradation
Authors
Xie, LinYoon, SoyeonCho, Yun JuKim, Kyungkon
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2015
Journal Title
ORGANIC ELECTRONICS
ISSN
1566-1199JCR Link1878-5530JCR Link
Citation
vol. 25, pp. 212 - 218
Keywords
Organic solar cellBilayer solar cellTiO2 interlayerCharge recombination
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Both charge recombination and degradation in sequential solution processed polymer/fullerene bilayer organic photovoltaics (OPV) are effectively reduced by the insertion of a TiO2 inter-layer between the bilayer and Al electrode. The polymer/fullerene bilayer composed of a poly(3-hexylthiophene) (P3HT) bottom-layer and a [6,6] phenyl C61-butyric acid methyl ester (PCBM) top-layer shows significant change in morphology due to the substantial inter-penetration of P3HT and PCBM during the thermal annealing process. Consequently, the bilayer surface becomes P3HT rich resulting in significant charge recombination at the bilayer/Al interface of the bilayer OPV. The charge recombination rate of the bilayer OPV is reduced by one order of magnitude upon the insertion of a TiO2 nanoparticle inter-layer between the bilayer and the Al electrode after the thermal annealing process. In contrast, when the thermal annealing process is conducted after insertion of the inter-layer, the effect of the TiO2 inter-layer becomes insignificant. The VOC and efficiency of the bilayer OPV is greatly enhanced from 0.37 to 0.66 V and 1.2% to 3.7%, respectively by utilizing the properly constructed TiO2 inter-layer in the bilayer OPV. Additionally, insertion of the TiO2 inter-layer significantly improves the stability of the bilayer OPV. The bilayer OPV with a TiO2 inter-layer maintains 51% of its initial PCE after storage under dark ambient conditions for 700 h without encapsulation, whereas the bilayer OPV without a TiO2 inter-layer did not show any solar cell performance after 200 h under the same conditions. (C) 2015 Elsevier B.V. All rights reserved.
DOI
10.1016/j.orgel.2015.06.039
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자연과학대학 > 화학·나노과학전공 > Journal papers
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