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Thermally stable bulk heterojunction prepared by sequential deposition of nanostructured polymer and fullerene

Title
Thermally stable bulk heterojunction prepared by sequential deposition of nanostructured polymer and fullerene
Authors
Hwang H.Lee H.Shafian S.Lee W.Seok J.Ryu K.Y.Ryu D.Y.Kim K.
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2017
Journal Title
Polymers
ISSN
2073-4360JCR Link
Citation
vol. 9, no. 9
Keywords
Bulk heterojunctionOrganic solar cellSequential depositionStability
Publisher
MDPI AG
Indexed
SCIE; SCOPUS WOS scopus
Abstract
A morphologically-stable polymer/fullerene heterojunction has been prepared by minimizing the intermixing between polymer and fullerene via sequential deposition (SqD) of a polymer and a fullerene solution. A low crystalline conjugated polymer of PCPDTBT (poly[2,6-(4,4- bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b0]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)]) has been utilized for the polymer layer and PC71BM (phenyl-C71-butyric-acid-methyl ester) for the fullerene layer, respectively. Firstly, a nanostructured PCPDTBT bottom layer was developed by utilizing various additives to increase the surface area of the polymer film. The PC71BM solution was prepared by dissolving it in the 1,2-dichloroethane (DCE), exhibiting a lower vapor pressure and slower diffusion into the polymer layer. The deposition of the PC71BM solution on the nanostructured PCPDTBT layer forms an inter-digitated bulk heterojunction (ID-BHJ) with minimized intermixing. The organic photovoltaic (OPV) device utilizing the ID-BHJ photoactive layer exhibits a highly reproducible solar cell performance. In spite of restricted intermixing between the PC71BM and the PCPDTBT, the efficiency of ID-BHJ OPVs (3.36%) is comparable to that of OPVs (3.87%) prepared by the conventional method (deposition of a blended solution of polymer:fullerene). The thermal stability of the ID-BHJ is superior to the bulk heterojunction (BHJ) prepared by the conventional method. The ID-BHJ OPV maintains 70% of its initial efficiency after thermal stress application for twelve days at 80 °C, whereas the conventional BHJ OPV maintains only 40% of its initial efficiency. © 2017 by the authors.
DOI
10.3390/polym9090456
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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