TY - JOUR
T1 - High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having π-Extended Units with Broad Near-IR Absorption
AU - Su, Ning
AU - Ma, Ruijie
AU - Li, Guoping
AU - Liu, Tao
AU - Feng, Liang Wen
AU - Lin, Chenjian
AU - Chen, Jianhua
AU - Song, Jun
AU - Xiao, Yiqun
AU - Qu, Junle
AU - Lu, Xinhui
AU - Sangwan, Vinod K.
AU - Hersam, Mark C.
AU - Yan, He
AU - Facchetti, Antonio
AU - Marks, Tobin J.
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (61804073/61620106016/61835009/61775145). N.S. thanks the China Postdoctoral Science Foundation (2019M663036). V.K.S., L.-W.F., M.C.H., and T.J.M. acknowledge support from the Center for Light Energy Activated Redox Processes (LEAP), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under award DE-SC0001059 and the MatCI Facility that receives support from the National Science Foundation MRSEC Program (NSF DMR-1720139) of the Northwestern University Materials Research Center. G.L., A.F., and T.J.M. also acknowledge support from the US Office of Naval Research contract N00014-20-1-2116, the Qatar National Research Foundation grant NPRP12S-0304-190227/02-484761, and the U.S. Department of Energy under contract no. DE-AC02-05CH11231 at beamline 8-ID-E of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/2/12
Y1 - 2021/2/12
N2 - We report two new poly-small-molecule acceptors, PYN-BDT and PYN-BDTF, which serve, by virtue of their π-extended naphthalene rings, as broad optical cross-section macromolecular absorbers (extending to ≈900 nm; ΔEopticalgap = 1.38 eV) in all-polymer solar cells (APSCs). APSCs fabricated by blending PYN-BDT or PYN-BDTF with PM6 exhibit power conversion efficiencies (PCEs) of 7.24 and 9.08%, respectively, while blends with PBDB-T exhibits far higher PCEs of 12.06 and 13.22%, respectively; the latter cell achieves Jsc = 22.28 mA cm-2, among the highest known for an APSC. The results of blend morphology, GIWAXS, charge transport, exciton and carrier dynamics, PL quenching efficiency, and impedance-based analysis indicate that the PBDB-TT:PYN-BDTF blends and their APSCs outperform the corresponding PM6:PYN-BDTF devices due to significantly suppressed bimolecular recombination. These results demonstrate that π-conjugative extension of individual polymer acceptor blocks represents an efficient strategy to broaden APSC optical cross sections, decrease bimolecular recombination, and achieve high-performance cells with enhanced Jsc metrics.
AB - We report two new poly-small-molecule acceptors, PYN-BDT and PYN-BDTF, which serve, by virtue of their π-extended naphthalene rings, as broad optical cross-section macromolecular absorbers (extending to ≈900 nm; ΔEopticalgap = 1.38 eV) in all-polymer solar cells (APSCs). APSCs fabricated by blending PYN-BDT or PYN-BDTF with PM6 exhibit power conversion efficiencies (PCEs) of 7.24 and 9.08%, respectively, while blends with PBDB-T exhibits far higher PCEs of 12.06 and 13.22%, respectively; the latter cell achieves Jsc = 22.28 mA cm-2, among the highest known for an APSC. The results of blend morphology, GIWAXS, charge transport, exciton and carrier dynamics, PL quenching efficiency, and impedance-based analysis indicate that the PBDB-TT:PYN-BDTF blends and their APSCs outperform the corresponding PM6:PYN-BDTF devices due to significantly suppressed bimolecular recombination. These results demonstrate that π-conjugative extension of individual polymer acceptor blocks represents an efficient strategy to broaden APSC optical cross sections, decrease bimolecular recombination, and achieve high-performance cells with enhanced Jsc metrics.
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U2 - 10.1021/acsenergylett.1c00009
DO - 10.1021/acsenergylett.1c00009
M3 - Article
AN - SCOPUS:85100775113
SN - 2380-8195
VL - 6
SP - 728
EP - 738
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 2
ER -
