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2016 ; 7
(9
): 6068-6075
Nephropedia Template TP
gab.com Text
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English Wikipedia
Donor-?-donor type hole transporting materials: marked ?-bridge effects on
optoelectronic properties, solid-state structure, and perovskite solar cell
efficiency
#MMPMID30034747
Paek S
; Zimmermann I
; Gao P
; Gratia P
; Rakstys K
; Grancini G
; Nazeeruddin MK
; Rub MA
; Kosa SA
; Alamry KA
; Asiri AM
Chem Sci
2016[Sep]; 7
(9
): 6068-6075
PMID30034747
show ga
Donor-?-bridge-donor type oligomers (D-?-D) have been studied intensively as
active materials for organic optoelectronic devices. In this study, we introduce
three new D-?-D type organic semiconductors incorporating thiophene or
thienothiophene with two electron-rich TPA units, which can be easily synthesized
from commercially available materials. A thorough comparison of their
optoelectronic and structural properties was conducted, revealing the strong
influence of the extent of longitudinal ?-bridge conjugation on both the solid
structure of the organic semiconductive materials and their photovoltaic
performance when applied as hole transporting materials (HTM) in perovskite solar
cells. Single-crystal measurements and time-resolved photoluminescence (TRPL)
studies indicate that these coplanar donor-?-donor type HTMs could be promising
alternatives to state-of-the-art spiro-OMeTAD, due to the multiple intermolecular
short contacts as charge transporting channels and efficient charge extraction
properties from the perovskite layer. The optimized devices with PEH-9 exhibited
an impressive PCE of 16.9% under standard global AM 1.5 illumination with
minimized hysteretic behaviour, which is comparable to that of devices using
spiro-OMeTAD under similar conditions. Ambient stability after 400 h revealed
that 93% of the energy conversion efficiency was retained for PEH-9, indicating
that the devices had good long-term stability.