Efficiently controlling the charge transport properties of existing organic semiconductors to achieve a higher charge mobility is one of the hottest issues in the field of organic electronics. Compared with...
The highly integrated miniature electronic
and photonic components
have been extensively studied because they exhibit a significant potential
in producing scaled circuits with high performance. Inspired by the
spontaneous organization of molecular units into ordered structures,
we demonstrate for the first time a controllable fabrication of super-ordered
graphene–hexagonal boron nitride (h-BN) planar heterostructure
arrays on a liquid Cu surface by a chemical vapor deposition method.
The area of graphene and h-BN arrays can reach up to 1 cm2 with a prominent uniformity in morphology and orientation. The size
and density of the arrays can be precisely tailored by modulating
the composition ratio of the CH4/H2. The electrostatic
force among the heterostructure units and the fluidity of the liquid
metal surface are accounted for the formation of the super-ordered
arrays. Moreover, selective etching of h-BN in the heterostructure
is also achieved, offering a direct top-down approach for the construction
of ordered 2D patterns. The construction and etching of large-scale
super-ordered 2D heterostructure arrays paves the way toward scaled
integrated devices.
An anthracene‐based molecular crystal with a unique "slipped herringbone" packing motif was developed by crystal engineering through terminal tert‐butylation. Appropriate exciton–exciton coupling/electron–phonon coupling originating from the unique crystal packing induces a remarkably strong solid‐state emission and efficient charge transport, as reported by Wenping Hu et al. in their Research Article (e202206825).
Organic semiconductors with combinative high carrier mobility and efficient solid-state emission are full of challenges but urgently pursued for developing new emerging optoelectronics. Herein, by delicately regulating the crystal packing of an anthracene-based molecular crystal via terminal tert-butylation, we developed a superior high mobility emissive molecule, 2,6-di(6-tert-butylnaphthyl)anthracene (TBU-DNA). The unique "slipped herringbone" packing motif of TBU-DNA enables its appropriate exciton-exciton coupling and electron-phonon coupling, thus resulting in remarkably high solid-state emission (photoluminescence quantum yield, Φ F � 74.9 %) and efficacious charge transport (carrier mobility, μ = 5.0 cm 2 V À 1 s À 1 ). Furthermore, OLETs based on TBU-DNA show an external quantum efficiency (EQE) of 1.8 %, which is among the highest EQE values for single component OLETs reported till now. This work presents a crystal engineering strategy via exquisite molecular design to realize high mobility emissive organic semiconductors.
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