Efficient ternary bulk heterojunction solar cells with PCDTBT as hole-cascade material
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AbstractTernary bulk hetero-junction (BHJ) architecture for organic solar cells has been developed to enhance the power conversion efficiency (PCE) by expanding the light absorption range and smoothing the energy level at the BHJ interface. In this work, we report on a ternary polymer blend solar cell with two donor materials, polythieno[3,4-b]-thiophene/benzodithiophene (PTB7), poly[N-9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT), and using C71 -butyric acid methyl ester (PC71BM) as acceptor material. The resultant device shows an optimized PCE of 7.81% (control sample, 7.06%), with an open circuit voltage (V) of 0.76 V, a short circuit current (Jx) of 15.4 mA/cm(2) and a fill factor (FF) of 66.7%. The improved device performance is mainly attributed to the enhanced charge separation, improved hole mobility, and better film morphology. And we find that the third component PCDTBTcan reduce charge recombination in the ternary blend system as well. The results bring new insight into the future development of high efficiency ternary organic solar cells. (C) 2015 Elsevier Ltd. All rights reserved.
All Author(s) ListXiao YB, Wang H, Zhou S, Yan KY, Xie WG, Guan ZC, Tsang SW, Xu JB
Journal nameNano Energy
Year2016
Month1
Day1
Volume Number19
PublisherELSEVIER SCIENCE BV
Pages476 - 485
ISSN2211-2855
eISSN2211-3282
LanguagesEnglish-United Kingdom
KeywordsBHJ; Energy level; Ternary polymer solar cells; Work function pinning
Web of Science Subject CategoriesChemistry; Chemistry, Physical; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Science & Technology - Other Topics

Last updated on 2021-17-01 at 01:00