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A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor
Author(s) -
Li Wanning,
Ye Long,
Li Sunsun,
Yao Huifeng,
Ade Harald,
Hou Jianhui
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707170
Subject(s) - intramolecular force , materials science , organic solar cell , energy conversion efficiency , acceptor , electron acceptor , absorption (acoustics) , dipole , miscibility , photochemistry , photovoltaic system , solar cell , relaxation (psychology) , polymer solar cell , optoelectronics , chemical physics , chemistry , organic chemistry , polymer , physics , ecology , composite material , biology , condensed matter physics , psychology , social psychology
Abstract Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well‐studied properties, a stronger intramolecular electron push–pull effect also affords other advantages in nonfullerene acceptors. A strong push–pull effect improves the dipole moment of the wings in IT‐4F over IT‐M and results in a lower miscibility than IT‐M when blended with PBDB‐TF. This feature leads to higher domain purity in the PBDB‐TF:IT‐4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push–pull effect also decreases the vibrational relaxation, which makes IT‐4F more promising than IT‐M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB‐TF:IT‐4F‐based devices.