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Twisted Linker Effect on Naphthalene Diimide‐Based Dimer Electron Acceptors for Non‐fullerene Organic Solar Cells
Author(s) -
Oh Jae Taek,
Ha Yeon Hee,
Kwon SoonKi,
Song Seyeong,
Kim Jin Young,
Kim YunHi,
Choi Hyosung
Publication year - 2018
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201800108
Subject(s) - fullerene , linker , organic solar cell , dimer , diimide , photochemistry , materials science , molecule , chemistry , polymer , organic chemistry , perylene , computer science , operating system
Naphthalene diimide (NDI) dimers, NDI–Ph–NDI with a phenyl linker and NDI–Xy–NDI with a xylene linker, are designed and synthesized. The influence of the xylene and phenyl linkers on optical properties, electrochemical properties, morphology, and device performance is systematically investigated. Non‐fullerene organic solar cells (OSCs) with NDI–Ph–NDI show poor device efficiency due to aggregation of polymer chains and/or NDI dimers caused by the highly planar structure of NDI–Ph–NDI. Although NDI–Xy–NDI is a non‐planar structure, uniform surface morphology and weak bimolecular recombination lead to high power conversion efficiencies of 3.11%, which is the highest value in non‐fullerene OSCs with NDI small molecules.