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Acene‐Modified Small‐Molecule Donors for Organic Photovoltaics
Author(s) -
Sung Min Jae,
Hong Jisu,
Cha Hyojung,
Jiang Yifei,
Park Chan Eon,
Durrant James R.,
An Tae Kyu,
Kwon SoonKi,
Kim YunHi
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201902177
Subject(s) - acene , small molecule , materials science , molecule , organic solar cell , crystallinity , acceptor , photovoltaics , anthracene , nanotechnology , polymer , photochemistry , chemical engineering , chemistry , organic chemistry , photovoltaic system , ecology , biochemistry , physics , engineering , composite material , biology , condensed matter physics
A series of acene‐modified small molecules have been designed and synthesized, and their photovoltaic characteristics were studied by using the small molecules in organic photovoltaics (OPVs). Different cores were introduced to modulate the conjugation lengths of the small molecules and the bulk heterojunction (BHJ) morphologies. Three small‐molecule donors were prepared, namely Ph‐TTR, Na‐TTR, and An‐TTR, which have phenyl, naphthalene, and anthracene moieties, respectively, as conjugated cores. These donors were synthesized in a few steps and exhibited favorable BHJ morphologies, thereby giving promising power conversion efficiencies (PCEs). The donors showed excellent miscibility with the acceptor PC 71 BM, and the use of the additive 1,8‐diiodooctane (DIO) led to a remarkable increase in crystallinity, thereby increasing the PCEs of their OPVs. Of the three donors, Na‐TTR showed the most efficient charge carrier generation and favorable molecular packing structures; hence, of the three types of devices tested, the Na‐TTR:PC 71 BM devices exhibited the highest PCE, specifically 6.27 %, without pre‐ or post‐treatments. The promising PCEs achieved from these easily synthesized acene‐modified small molecules suggested that acene‐modified small molecules can be useful materials in OPVs.