16 research outputs found
Covalently Bound Clusters of Alpha-Substituted PDIî—¸Rival Electron Acceptors to Fullerene for Organic Solar Cells
A cluster
type of electron acceptor, TPB, bearing four α-perylenediimides
(PDIs), was developed, in which the four PDIs form a cross-like molecular
conformation while still partially conjugated with the BDT-Th core.
The blend TPB:PTB7-Th films show favorable morphology and efficient
charge dissociation. The inverted solar cells exhibited the highest
PCE of 8.47% with the extraordinarily high <i>J</i><sub>sc</sub> values (>18 mA/cm<sup>2</sup>), comparable with those
of
the corresponding PC<sub>71</sub>BM/PTB7-Th-based solar cells
Electron-Rich Pyrroloindacenodithiophenes: Synthesis, Characterization, and Spectroscopic Studies
<i>N</i>-Alkyl substituted pyrroloindacenodithiophene
(PIDT) and their phenyl substituted derivatives were synthesized.
Their single-crystal structures and electrochemical and spectroscopic
properties were investigated. Experimental results showed PIDT displayed
strong electron-donating properties, reversible redox behaviors, and
strong fluorescence and could be controlled to oxidize to radical
cation and dication with distinctive optical changes. These attractive
properties demonstrated the potential applications of PIDT in the
field of switches, molecular machines, and information memories
Electron-Rich Pyrroloindacenodithiophenes: Synthesis, Characterization, and Spectroscopic Studies
<i>N</i>-Alkyl substituted pyrroloindacenodithiophene
(PIDT) and their phenyl substituted derivatives were synthesized.
Their single-crystal structures and electrochemical and spectroscopic
properties were investigated. Experimental results showed PIDT displayed
strong electron-donating properties, reversible redox behaviors, and
strong fluorescence and could be controlled to oxidize to radical
cation and dication with distinctive optical changes. These attractive
properties demonstrated the potential applications of PIDT in the
field of switches, molecular machines, and information memories
High Performance Ternary Organic Solar Cells due to Favored Interfacial Connection by a Non-Fullerene Electron Acceptor with Cross-Like Molecular Geometry
The non-fullerene
electron acceptor, TPB, exhibits a unique cross-like
molecular geometry which helps it to stay preferentially at the interfaces
between PTB7-Th and PC<sub>71</sub>BM, when it is used as the third
component in ternary OPV cells. The four PDI units connected to TPB’s
core provide multiple contact points between PTB7-Th and PC<sub>71</sub>BM phases, thus facilitating interfacial charge extraction and improving
the overall PCE to 10.6% from 9.8% after 10% TPB was added as the
third component. This paper describes detailed experimental results
and a model to explain these observations
Electron Acceptors Based on α‑Substituted Perylene Diimide (PDI) for Organic Solar Cells
Perylene
diimide (PDI) derivatives functionalized at the ortho-position
(αPPID, αPBDT) were synthesized and used as electron acceptors
in non-fullerene organic photovoltaic cells. Because of the good planarity
and strong π-stacking of ortho-functionalized PDI, the αPPID
and αPBDT exhibit a strong tendency to form aggregates, which
endow the materials with high electron mobility. The inverted OPVs employing αPDI-based compounds as the acceptors
and PBT7-Th as the donor give the highest power conversion efficiency
(PCE) values: 4.92% for αPBDT-based devices and 3.61% for αPPID-based
devices, which are, respectively, 39% and 4% higher than that of their
β-substituted counterparts βPBDT and βPPID. Charge
separation studies show more efficient exciton dissociation at interfaces
between αPDI-based compounds and PTB7-Th. The results suggest
that α-substituted PDI derivatives are more promising electron
acceptors for organic photovoltaic (OPV) components than β-isomers
Thieno[3,4‑<i>c</i>]pyrrole-4,6-dione Containing Copolymers for High Performance Field-Effect Transistors
ThienoÂ[3,4-<i>c</i>]Âpyrrole-4,6-dione
(TPD) containing copolymer semiconductors <b>P1–P3</b> were strategically designed and successfully synthesized. Their
physicochemical properties were thoroughly investigated. All polymers
exhibited good solution processability and high humidity stability
in thin film transistors (TFTs). Transistor electrical characterization
showed the device performance was sensitive to the alkyl chain substituent
orientations of the polymers. A maximum TFT hole mobility of ∼1.29
cm<sup>2</sup>/(V s) was observed for <b>P3</b>-based devices,
a recorded mobility for TPD containing polymer semiconductors reported
to date. The corresponding thin-film morphologies and polymer chains
packing were investigated in detail by AFM and 2D-GIXD to correlate
with the alkyl orientation-dependent carrier mobility of <b>P1–P3</b>. Experimental results showed the alkyl chain orientations determined
the polymer chains packing pattern in the thin films, the film morphologies,
and the resulting device performances of <b>P1–P3</b>
Syntheses and Properties of Nine-Ring-Fused Linear Thienoacenes
Ï€-Extended nine-ring-fused
linear thienoacenes <b>1a</b>–<b>c</b> with internal
thienoÂ[3,2-<i>b</i>;4,5-<i>b</i>′]Âdithiophene
substructures were synthesized.
Their optical and electrochemical properties were investigated. Thin-film
transistor characteristics showed all compounds displayed high device
reproducibility and nearly no dependence on substrate temperatures.
The highest performance was observed for <b>1c</b>-based devices
with mobility up to 1.0 cm<sup>2</sup>/Vs and current on/off ratio
of 10<sup>7</sup>, whereas the maximum mobility was 0.5 cm<sup>2</sup>/Vs for <b>1b</b> and 0.011 cm<sup>2</sup>/Vs for <b>1a</b>
Rational Design of Porous Conjugated Polymers and Roles of Residual Palladium for Photocatalytic Hydrogen Production
Developing
highly efficient photocatalyts for water splitting is
one of the grand challenges in solar energy conversion. Here, we report
the rational design and synthesis of porous conjugated polymer (PCP)
that photocatalytically generates hydrogen from water splitting. The
design mimics natural photosynthetics systems with conjugated polymer
component to harvest photons and the transition metal part to facilitate
catalytic activities. A series of PCPs have been synthesized with
different light harvesting chromophores and transition metal binding
bipyridyl (bpy) sites. The photocatalytic activity of these bpy-containing
PCPs can be greatly enhanced due to the improved light absorption,
better wettability, local ordering structure, and the improved charge
separation process. The PCP made of strong and fully conjugated donor
chromophore DBD (M<sub>4</sub>) shows the highest hydrogen production
rate at ∼33 μmol/h. The results indicate that copolymerization
between a strong electron donor and weak electron acceptor into the
same polymer chain is a useful strategy for developing efficient photocatalysts.
This study also reveals that the residual palladium in the PCP networks
plays a key role for the catalytic performance. The hydrogen generation
activity of PCP photocatalyst can be further enhanced to 164 μmol/h
with an apparent quantum yield of 1.8% at 350 nm by loading 2 wt %
of extra platinum cocatalyst
Additional file 2: of Effect of the Chinese traditional prescription Suo Quan Wan on TRPV1 expression in the bladder of rats with bladder outlet obstruction
A Chinese article about Suoquan Wan combined with Solifenacin Succinate on overactive. (PDF 139 kb
Additional file 1: of Effect of SQW on the bladder function of mice lacking TRPV1
The quality control of Suoquanwan (SQW). (PDF 139 kb