Construction of simple and low-cost acceptors for efficient non-fullerene organic solar cells

Liao, Junxu; Zheng, Peijin; Cai, Zhipeng; Shen, Songping; Xu, Gengbiao; Zhao, Hongbin; Xu, Yongjun

doi:10.1016/j.orgel.2020.106026

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…Some studies have compared fluorene and carbazole central units, with differences in optical and electronic properties due to different electron-donating strengths. 31,70,71 In some of these studies, they perform similarly 31,71 , but in others, fluorene-based NFA performed significantly better. 70 In this dataset there are 224 unique unfused NFAs, of which 33 have a PCE greater than 12%.…”

Section: Unfused Nfa Backbonementioning

confidence: 94%

“…31,70,71 In some of these studies, they perform similarly 31,71 , but in others, fluorene-based NFA performed significantly better. 70 In this dataset there are 224 unique unfused NFAs, of which 33 have a PCE greater than 12%. The most common unit within these unfused NFAs is a thiophene, followed by a cyclopentadithiophene (CPDT) unit.…”

Section: Unfused Nfa Backbonementioning

confidence: 94%

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Meta-Analysis of Molecular Design Strategies for Non-Fullerene Acceptor Based Organic Solar Cell Materials

Greenstein,

Daas,

Hutchison

2024

Preprint

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The design of high-performing OSC materials is an active field of research. Many review articles summarize certain subclasses of NFAs, however, no broad overall analysis has been performed on the photovoltaic impact of chemical modifications made. This meta-analysis investigates various molecular design strategies for NFAs and donors and their effects on OSC device performance. Using a new dataset containing 1975 NFA/donor pairs, we performed matched-pair analysis on many design strategies to try to discern whether it has a significant impact on PCE. For the NFA, the class and size of the NFA, heteroatom substitution, types of rings and their sequence in the fused core, side chains, halogenation of terminal groups, and the presence of a pi-bridge are examined. For the donor polymers, the monomer identities, the types of side chains, and the halogenation of the polymer are examined. Some molecular design strategies that were found to significantly improve the PCE include branched instead of linear side chains, fused cores containing 8 rings, fused NFAs containing pyran, pyrrole, and selenophene, fused cores containing an odd number of thiophenes, the presence of pi-bridge units, halogenating the NFA and donor, incorporation of alkylsilyl chains instead of alkyl chains in donor polymers, as well as multiple others.

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Section: Unfused Nfa Backbonementioning

confidence: 94%

Section: Unfused Nfa Backbonementioning

confidence: 94%

Meta-Analysis of Molecular Design Strategies for Non-Fullerene Acceptor Based Organic Solar Cell Materials

Greenstein,

Daas,

Hutchison

2024

Preprint

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“…2-(6-Oxo-5,6-dihydro-4 H -cyclopenta[ c ]-thiophene-4-ylidene)malononitrile denoted as TC is a potential end-group for the designing of A–D–A acceptors due to its strong light harvesting from the electron delocalization and reasonable charge transport originating from the strong intermolecular S–S interactions. 48 , 49 Zou et al have created an A-DA′D–A NFA Y10 consisting of a weak TPBT-based core and two electron-accepting units of TC, and the PSCs based on this non-fullerene acceptor (NFA) demonstrate a PCE of 13.46%. 50 Xie et al designed an NFA of ITCPTC with the thiophene fused ending group and achieved a PCE of 11.8% with an FF of 0.751, which is 20% higher than for the ITIC-based counterpart.…”

Section: Introductionmentioning

confidence: 99%

“…The LUMO levels of A-D-A SMAs and, consequently, the V OC values can be significantly influenced by terminal units according to predictions made by researchers. − Additionally, since the molecular packing of A-D-A SMAs is mostly dependent on the terminal group stacking, tightly packed end-groups speed up the electron transport. 2-(6-Oxo-5,6-dihydro-4 H -cyclopenta[ c ]-thiophene-4-ylidene)malononitrile denoted as TC is a potential end-group for the designing of A–D–A acceptors due to its strong light harvesting from the electron delocalization and reasonable charge transport originating from the strong intermolecular S–S interactions. , Zou et al have created an A-DA′D–A NFA Y10 consisting of a weak TPBT-based core and two electron-accepting units of TC, and the PSCs based on this non-fullerene acceptor (NFA) demonstrate a PCE of 13.46% . Xie et al designed an NFA of ITCPTC with the thiophene fused ending group and achieved a PCE of 11.8% with an FF of 0.751, which is 20% higher than for the ITIC-based counterpart .…”

Section: Introductionmentioning

confidence: 99%

Medium Bandgap Nonfullerene Acceptor for Efficient Ternary Polymer Solar Cells with High Open-Circuit Voltage

et al. 2023

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We have designed a new medium bandgap non-fullerene small-molecule acceptor consisting of an IDT donor core flanked with 2-(6-oxo-5,6-dihydro-4H-cyclopenta[c]-thiophene-4-ylidene) malononitrile (TC) acceptor terminal groups (IDT-TC) and compared its optical and electrochemical properties with the IDT-IC acceptor. IDT-TC showed an absorption profile from 300 to 760 nm, and it has an optical bandgap of 1.65 eV and HOMO and LUMO energy levels of −5.55 and −3.83 eV, respectively. In contrast to IDT-IC, IDT-TC has an upshifted LUMO energy level, which is advantageous for achieving high open-circuit voltage. Moreover, IDT-TC showed higher crystallinity and high electron mobility than IDT-IC. Using a wide bandgap D–A copolymer P as the donor, we compared the photovoltaic performance of IDT-TC, IDT-IC, and IDT-IC-Cl nonfullerene acceptors (NFAs). Polymer solar cells (PSCs) using P: IDT-TC, P: IDT-IC, and P:IDT-IC-Cl active layers achieved a power conversion efficiency (PCE) of 14.26, 11.56, and 13.34%, respectively. As the absorption profiles of IDT-IC-Cl and IDT-TC are complementary to each other, we have incorporated IDT-TC as the guest acceptor in the P: IDT-IC-Cl active layer to fabricate the ternary (P:IDT-TC: IDT-IC-Cl) PSC, demonstrating a PCE of 16.44%, which is significantly higher than that of the binary BHJ devices. The improvement in PCE for ternary PSCs is attributed to the efficient exploitation of excitons via energy transfer from IDT-TC to IDT-IC-Cl, suitable nanoscale phase separation, compact stacking distance, and more evenly distributed charge transport.

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Fullerene and polymer/fullerene nanomaterials in industry

Kausar

2023

Polymer/Fullerene Nanocomposites

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Construction of simple and low-cost acceptors for efficient non-fullerene organic solar cells

Cited by 12 publications

References 22 publications

Meta-Analysis of Molecular Design Strategies for Non-Fullerene Acceptor Based Organic Solar Cell Materials

Meta-Analysis of Molecular Design Strategies for Non-Fullerene Acceptor Based Organic Solar Cell Materials

Medium Bandgap Nonfullerene Acceptor for Efficient Ternary Polymer Solar Cells with High Open-Circuit Voltage

Fullerene and polymer/fullerene nanomaterials in industry

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