TY - JOUR
T1 - Rationalizing the Influence of Tunable Energy Levels on Quantum Efficiency to Design Optimal Non-Fullerene Acceptor-Based Ternary Organic Solar Cells
AU - Karuthedath, Safakath
AU - Paleti, Sri H.K.
AU - Sharma, Anirudh
AU - Yin, Hang
AU - Catherine, Catherine S.
AU - Chen, Si
AU - Xu, Han
AU - Alshehri, Nisreen
AU - Ramos, Nicolas
AU - Khan, Jafar I.
AU - Martin, Jaime
AU - Li, Gang
AU - Laquai, Frédéric
AU - Baran, Derya
AU - Gorenflot, Julien
N1 - Funding Information:
This publication is based on work supported by the KAUST Office of Sponsored Research (OSR) under award numbers CCF‐3079 and OSR‐CRG2018‐3746. J.M. and N.R.‐G. thank the support from Xunta de Galicia ED431F 2021/09. GIWAXS experiments were performed at NCD‐SWEET beamline at ALBA Synchrotron with the collaboration of ALBA staff.
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/4/26
Y1 - 2023/4/26
N2 - Non-fullerene acceptor (NFA)-based ternary bulk heterojunction solar cells (TSC) are the most efficient organic solar cells (OSCs) today due to their broader absorption and quantum efficiencies (QE) often surpassing those of corresponding binary blends. The impact on QE of the energetics driving charge transfer at the electron donor:electron acceptor (D/A) interfaces is studied in blends of PBDB-T-2F donor with several pairs of lower bandgap NFAs. As in binary blends, the ionization energy offset between donor and acceptor (ΔIE) controls the QE and maximizes for ΔIE > 0.5 eV. However, ΔIE is not controlled by the individual NFAs IEs but by their average, weighted for their blending ratio. Using this property, the QE of a PBDB-T-2F:IEICO binary blend that has an insufficient ΔIE for charge generation is improved by adding a deep IE third component: IT-4F. Combining two NFAs enables to optimize the D/A energy alignment and cells’ QE without molecular engineering.
AB - Non-fullerene acceptor (NFA)-based ternary bulk heterojunction solar cells (TSC) are the most efficient organic solar cells (OSCs) today due to their broader absorption and quantum efficiencies (QE) often surpassing those of corresponding binary blends. The impact on QE of the energetics driving charge transfer at the electron donor:electron acceptor (D/A) interfaces is studied in blends of PBDB-T-2F donor with several pairs of lower bandgap NFAs. As in binary blends, the ionization energy offset between donor and acceptor (ΔIE) controls the QE and maximizes for ΔIE > 0.5 eV. However, ΔIE is not controlled by the individual NFAs IEs but by their average, weighted for their blending ratio. Using this property, the QE of a PBDB-T-2F:IEICO binary blend that has an insufficient ΔIE for charge generation is improved by adding a deep IE third component: IT-4F. Combining two NFAs enables to optimize the D/A energy alignment and cells’ QE without molecular engineering.
KW - ionization energy offset
KW - organic photovoltaics
KW - quantum efficiency
KW - solar cell design rules
KW - ternary solar cells
UR - http://www.scopus.com/inward/record.url?scp=85150490738&partnerID=8YFLogxK
U2 - 10.1002/aenm.202203464
DO - 10.1002/aenm.202203464
M3 - Journal article
AN - SCOPUS:85150490738
SN - 1614-6832
VL - 13
SP - 1
EP - 13
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 16
M1 - 2203464
ER -