2 research outputs found
Highly Crystalline Films of Organic Small Molecules with Alkyl Chains Fabricated by Weak Epitaxy Growth
Because
side-chain engineering of organic conjugated molecules
has been widely utilized to tune organic solid-state optoelectronic
properties, the achievement of their high-quality films is important
for realizing high-performance devices. Here, highly crystalline films
of an organic molecule with short alkyl chains, 5,8,15,18-tetrabutyl-5,8,15,18-tetrahydroindolo[3,2-<i>a</i>]indole[30,20:5,6]quinacridone (C4-IDQA), are fabricated
by weak epitaxy growth, and highly oriented, large-area, and continuous
films are obtained. Because of the soft matter properties, the C4-IDQA
molecules can adjust themselves to realize commensurate epitaxy growth
on the inducing layers and exhibited good lattice matching in the
thin film phase. The crystalline phase is also observed in thicker
C4-IDQA films. The growth behavior of C4-IDQA on the inducing layer
is further investigated, including the strong dependence of film morphologies
on substrate temperatures and deposition rates due to the poor diffusion
ability of C4-IDQA molecules. Moreover, highly crystalline films and
high electron field-effect mobility are also obtained for the small
molecule <i>N</i>,<i>N</i>′-dioctyl-3,4:9,10-perylene
tetracarboxylic diimide (C8-PTCDI), which demonstrate that the weak
epitaxy growth method could be an effective way to fabricate highly
crystalline films of organic small molecules with flexible side chains
Highly Crystalline Films of Organic Small Molecules with Alkyl Chains Fabricated by Weak Epitaxy Growth
Because
side-chain engineering of organic conjugated molecules
has been widely utilized to tune organic solid-state optoelectronic
properties, the achievement of their high-quality films is important
for realizing high-performance devices. Here, highly crystalline films
of an organic molecule with short alkyl chains, 5,8,15,18-tetrabutyl-5,8,15,18-tetrahydroindolo[3,2-<i>a</i>]indole[30,20:5,6]quinacridone (C4-IDQA), are fabricated
by weak epitaxy growth, and highly oriented, large-area, and continuous
films are obtained. Because of the soft matter properties, the C4-IDQA
molecules can adjust themselves to realize commensurate epitaxy growth
on the inducing layers and exhibited good lattice matching in the
thin film phase. The crystalline phase is also observed in thicker
C4-IDQA films. The growth behavior of C4-IDQA on the inducing layer
is further investigated, including the strong dependence of film morphologies
on substrate temperatures and deposition rates due to the poor diffusion
ability of C4-IDQA molecules. Moreover, highly crystalline films and
high electron field-effect mobility are also obtained for the small
molecule <i>N</i>,<i>N</i>′-dioctyl-3,4:9,10-perylene
tetracarboxylic diimide (C8-PTCDI), which demonstrate that the weak
epitaxy growth method could be an effective way to fabricate highly
crystalline films of organic small molecules with flexible side chains