Enhanced Fill Factor through Chalcogen Side Chain Manipulation in Small-Molecule Photovoltaics

被引：23
作者：
Aldrich, Thomas J. [1 ,2 ]
Leonardi, Matthew J. [1 ,2 ]
Dudnik, Alexander S. [1 ,2 ]
Eastham, Nicholas D. [1 ,2 ]
Harutyunyan, Boris [2 ,3 ]
Fauvell, Thomas J. [1 ,2 ,5 ]
Manley, Eric F. [1 ,2 ,5 ]
Zhou, Nanjia [2 ,4 ]
Butler, Melanie R. [1 ,2 ]
Harschneck, Tobias [1 ,2 ]
Ratner, Mark A. [1 ,2 ]
Chen, Lin X. [1 ,2 ,5 ]
Bedzyk, Michael J. [2 ,3 ,4 ]
Chang, Robert P. H. [2 ,4 ]
Melkonyan, Ferdinand S. [1 ,2 ]
Facchetti, Antonio [1 ,2 ,6 ]
Marks, Tobin J. [1 ,2 ,4 ]
机构：
[1] Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA
[2] Northwestern Univ, Argonne Northwestern Solar Energy Res Ctr, Evanston, IL 60208 USA
[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
[4] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[5] Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Lemont, IL 60439 USA
[6] Flexterra Corp, 8045 Lamon Ave, Skokie, IL 60077 USA
来源：
ACS ENERGY LETTERS | 2017年 / 2卷 / 10期
关键词：
POLYMER SOLAR-CELLS; POWER CONVERSION EFFICIENCY; TRANSIENT ABSORPTION; CHARGE RECOMBINATION; DIKETOPYRROLOPYRROLE; DONOR; BENZODITHIOPHENE; FULLERENE; ALKYLTHIO; DYNAMICS;
D O I：
10.1021/acsenergylett.7b00743
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The fill factor (FF) of organic photovoltaic (OPV) devices has proven difficult to optimize by synthetic modification of the active layer materials. In this contribution, a series of small-molecule donors (SMDs) incorporating chalcogen atoms of increasing atomic number (Z), namely oxygen, sulfur, and selenium, into the side chains are synthesized and the relationship between the chalcogen Z and the FF of OPV devices is characterized. Larger Z chalcogen atoms are found to consistently enhance FF in bulk-heterojunction OPVs containing PC61BM as the acceptor material. A significant,similar to 8% FF increase is obtained on moving from O to S to Se across three series of SMDs. The FF enhancement is found to result from the combination of more ordered morphology and decreased charge recombination in blend films for the high-Z-chalcogen SMDs. Because this FF enhancement is found within three series orSMDs, the overall strategy is promising for new SMD materials design.
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页码：2415 / 2421
页数：7
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