Two acetylene-bridged molecules, built by grafting phthalimides on thienoisoindigo (TII) and diketopyrrolopyrrole (DPP) blocks, have been synthesized, characterized and evaluated as electron acceptor materials in air-processed inverted organic solar cells.
New
three-dimensional hole-transporting materials (HTMs) based
on either 9,9′-spirobifluorene (SBF) or spiro-[cyclopenta[1,2-b:5,4-b′]dithiophene-4,9′-fluorene]
(SDTF) core have been synthesized. All three HTMs, namely, SBFCz2, SDTFCz2, and SDTCz2F, are end-capped
with two peripheral 3,6-dimethoxydiphenylaminyl-carbazole (CzDMPA)
units. The HTMs behave as molecular glasses with glass transition
temperature (T
g) close to or higher than
that of the reference HTM Spiro-OMeTAD. Thermal and optoelectronic
properties strongly depend upon the nature of the bridging core unit
between the two CzDMPA units. The two fluorene-bridged molecules SBFCz2 and SDTFCz2 exhibit similar properties.
On the contrary, SDTCz2F, where the CzDMPA units are
bridged to the cyclopentadithiophene ring, displays lower highest
occupied molecular orbital/lowest unoccupied molecular orbital energy
levels and smaller band gaps. Upon doping of the HTM layer in perovskite
solar cells, in spite of a much lower hole mobility, SDTCz2F leads to the highest power conversion efficiency (16.4% compared
to 14.5 and 14.3% for SBFCz2 and SDTFCz2, respectively).
The selective mono-nitration of benzothioxanthene (BTXI) is demonstrated here, opening doors to a wide range of structures and reactions. In addition, a new series of derivaties was characterized expanding the scope for electronic organic purposes.
The synthesis of benzothioxanthene imide based dimers is reported herein. Subtle chemical modifications were carried out and their impact on the optical and electrochemical properties investigated for a better structure-property...
Donor-Acceptor-Donor conjugated systems are synthesized in good yield by double condensation of aromatic aldehydes of triarylamines with 2,3-diaminomaleonitrile under microwave activation with trifluoroacetic acid as catalyst. The electronic properties of the compounds are investigated and discussed and a first evaluation of their potential as donor material in organic photovoltaic cells is presented.
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