Amorphous
Ternary Charge-Cascade Molecules for Bulk Heterojunction Photovoltaics
Version 2 2018-08-10, 08:13
Version 1 2017-08-10, 16:20
Posted on 2018-08-10 - 08:13
Ternary bulk heterojunctions with
cascade-type energy-level configurations are of significant interest
for further improving the power conversion efficiency (PCE) of organic
solar cells. However, controlling the self-assembly in solution-processed
ternary blends remains a key challenge. Herein, we leverage the ability
to control the crystallinity of molecular semiconductors via a spiro
linker to demonstrate a simple strategy suggested to drive the self-assembly
of an ideal charge-cascade morphology. Spirobifluorene (SF) derivatives
with optimized energy levels from diketopyrrolopyrrole (DPP) or perylenediimide
(PDI) components, coded as SF-(DPP)4 and SF-(PDI)4, are synthesized and investigated for application as ternary components
in the host blend of poly(3-hexylthiophene-2,5-diyl):[6,6]phenyl-C61-butyric acid methyl ester (P3HT:PCBM). Differential scanning
calorimetry and X-ray/electron diffraction studies suggest that at
low loadings (up to 5 wt %) the ternary component does not perturb
crystallization of the donor:acceptor host blend. In photovoltaic
devices, up to 36% improvement in the PCE (from 2.5% to 3.5%) is found
when 1 wt % of either SF-(DPP)4 or SF-(PDI)4 is added, and this is attributed to an increase in the fill factor
and open-circuit voltage, while at higher loadings, the PCE decreased
because of a lower short-circuit current density. A comparison of
the quantum efficiency measurements [where light absorption of SF-(DPP)4 was found to give up to 95% internal conversion] suggests
that improvement due to enhanced light absorption or to better exciton
harvesting via resonance energy transfer is unlikely. These data,
together with the crystallinity results, support the inference that
the SF compounds are excluded to the donor:acceptor interface by crystallization
of the host blend. This conclusion is further supported by impedance
spectroscopy and a longer measured charge-carrier lifetime in the
ternary blend.
CITE THIS COLLECTION
DataCite
3 Biotech
3D Printing in Medicine
3D Research
3D-Printed Materials and Systems
4OR
AAPG Bulletin
AAPS Open
AAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)
Academic Medicine
Academic Pediatrics
Academic Psychiatry
Academic Questions
Academy of Management Discoveries
Academy of Management Journal
Academy of Management Learning and Education
Academy of Management Perspectives
Academy of Management Proceedings
Academy of Management Review
Jeanbourquin, Xavier A.; Rahmanudin, Aiman; Yu, Xiaoyun; Johnson, Melissa; Guijarro, Néstor; Yao, Liang; et al. (2017). Amorphous
Ternary Charge-Cascade Molecules for Bulk Heterojunction Photovoltaics. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b04983
or
Select your citation style and then place your mouse over the citation text to select it.
SHARE
Usage metrics
Read the peer-reviewed publication
AUTHORS (7)
XJ
Xavier A. Jeanbourquin
AR
Aiman Rahmanudin
XY
Xiaoyun Yu
MJ
Melissa Johnson
NG
Néstor Guijarro
LY
Liang Yao
KS
Kevin Sivula
KEYWORDS
PDIlight absorptionpower conversion efficiencysolution-processed ternary blendsPCEresonance energy transfercomponentcascade-type energy-level configurationsoptimized energy levelsquantum efficiency measurementsbutyric acid methyl esterSFAmorphous Ternary Charge-Cascade MoleculesDPPhost blend3HTBulk Heterojunction Photovoltaics Ternary bulk heterojunctions