Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700390
Keywords
binary equivalent; minimum voltage losses; same bulk and interface energy; ternary solar cells
Categories
Funding
- Knut and Alice Wallenberg Foundation
- Swedish Research Council [2016-05498]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO Mat LiU) [2009 00971]
- Goran Gustafsson Foundation for Research in Natural Sciences and Medicine
- Ministry of Science and Technology [2016YFA0200700]
- NSFC [21504066, 21534003, 51320105014]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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A new strategy for designing ternary solar cells is reported in this paper. A low-bandgap polymer named PTB7-Th and a high-bandgap polymer named PBDTTS-FTAZ sharing the same bulk ionization potential and interface positive integer charge transfer energy while featuring complementary absorption spectra are selected. They are used to fabricate efficient ternary solar cells, where the hole can be transported freely between the two donor polymers and collected by the electrode as in one broadband low bandgap polymer. Furthermore, the fullerene acceptor is chosen so that the energy of the positive integer charge transfer state of the two donor polymers is equal to the energy of negative integer charge transfer state of the fullerene, enabling enhanced dissociation of all polymer donor and fullerene acceptor excitons and suppressed bimolecular and trap assistant recombination. The two donor polymers feature good miscibility and energy transfer from high-bandgap polymer of PBDTTS-FTAZ to low-bandgap polymer of PTB7-Th, which contribute to enhanced performance of the ternary solar cell.
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