Novel polymer acceptors achieving 10.18% efficiency for all-polymer solar cells

Huang, Shaorong; Wu, Feiyan; Liu, Zuoji; Cui, Yongjie; Chen, Lie; Chen, Yiwang

doi:10.1016/j.jechem.2020.04.075

Cited by 23 publications

(11 citation statements)

References 45 publications

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“…Based on Wu's approach, [53,54] the calculated γ values of PM6, L15 and MBTI are 26.36 mJ m −2 for PM6 film, 23.38 mJ m −2 for L15 film, and 24.96 mJ m −2 for MBTI film, respectively. Next, we estimated the wetting coefficient of MBTI as the third component in the PM6:L15 blend using the interfacial energies of the three sets of materials [55] (Table S8, Supporting Information). The coefficient is estimated to be −0.60, which is within the range of −1 to 1.…”

Section: Resultsmentioning

confidence: 99%

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

et al. 2021

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Narrow‐bandgap n‐type polymers with high electron mobility are urgently demanded for the development of all‐polymer solar cells (all‐PSCs). Here, two regioregular narrow‐bandgap polymer acceptors, L15 and MBTI, with two electron‐deficient segments are synthesized by copolymerizing two dibrominated fused‐ring electron acceptors (FREA) with distannylated aromatic imide, respectively. Taking full advantage of the FREA and the imide, both polymer acceptors show narrow bandgap and high electron mobility. Benefiting from the more extended absorption, better backbone ordering, and higher electron mobility than those of its regiorandom analog, the L15‐based all‐PSC yields a high power conversion efficiency (PCE) of 15.2% when blended with the polymer donor PM6. More importantly, MBTI incorporating a benzothiophene‐core FREA segment shows relatively higher frontier molecular orbital levels than L15, forming a cascade‐like energy level alignment with L15 and PM6. Based on this, ternary all‐PSCs are designed where MBTI is introduced as a guest into the PM6:L15 host system. Thanks to further optimal blend morphology and more balanced charge transport, the PCE is improved up to 16.2%, which is among the highest values for all‐PSCs. The results demonstrate that combining an FREA and an aromatic imide to construct regioregular narrow‐bandgap polymer acceptors provides an effective approach to fabricate highly efficient all‐PSCs.

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Section: Resultsmentioning

confidence: 99%

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

et al. 2021

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“…Thus, new D-A type polymer acceptors (PSMA) have been developed by polymerizing NFSMAs and other donating building blocks. [39][40][41]117,[166][167][168][169][170][171][172][173][174][175][176][177][178][179][180][181] Because different regio-isomers are found in the chemical structures of NFSMA molecules, controlling the RR of the PSMA is an emerging factor for their design and application in high-efficiency all-PSCs. In this section, we will review a library of examples of RR control in the photovoltaic polymers and summarize the impacts of directional, positional, and sequential RRs on the PSC performance.…”

Section: Effects Of Rr On Polymer Solar Cells (Pscs)mentioning

confidence: 99%

“…The strong crystallization of the high RR P3HT greatly reduces its solubility and induces excessive phase separation with fullerene acceptors, decreasing the thermal and morphological stability of the PSCs. 179 For example, Fréchet and co-workers reported that increasing the RR and crystallinity resulted in more severe phase separation with PCBM under persistent heating. 83 As shown in Fig.…”

Section: Rr Of Homopolymersmentioning

confidence: 99%

Regioregularity-control of conjugated polymers: from synthesis and properties, to photovoltaic device applications

Kim

Park

et al. 2022

J. Mater. Chem. A

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“…Recently, in the search for polymer acceptors with improved absorption properties, a novel polymer acceptor PZ1 with a low band gap of 1.55 eV and a high maximum absorption coefficient (>10 5 cm –1 ) was successfully synthesized by Li et al by polymerizing a large π-fused-ring SMA building block (IDIC16) with long solubilizing sidechains and achieved an impressive PCE of 9.19% in all-PSCs. 23 Subsequently, some derivatives with similar molecular structures, including PFBDT-IDTIC, 24 PF2-DTSi, 25 PN1, 26 PF3-DTCO, 27 and PSF-IDIC, 28 were developed by modifying either the fused-ring SMA building blocks or donor units and achieved PCEs of over 10% in their all-PSCs. Moreover, by incorporating the booming fused-ring SMA building blocks of Y5 derivatives with different alkyl chain lengths, few polymer acceptors with an ultralow band gap of ∼1.40 eV, named A701, 29 PTPBT-ET, 30 PYT, 31 PJ1, 32 L14, 33 PF5-Y5, 34 PY-IT, 35 and PYA1 36 have been produced and have demonstrated high PCEs of 11–15% in the resulting all-PSCs.…”

Section: Introductionmentioning

confidence: 99%

Nonconjugated Terpolymer Acceptors with Two Different Fused-Ring Electron-Deficient Building Blocks for Efficient All-Polymer Solar Cells

Fan

Jalan

et al. 2021

ACS Appl. Mater. Interfaces

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The ternary polymerization strategy of incorporating different donor and acceptor units forming terpolymers as photovoltaic materials has been proven advantageous in improving power conversion efficiencies (PCEs) of polymer solar cells (PSCs). Herein, a series of low band gap nonconjugated terpolymer acceptors based on two different fused-ring electron-deficient building blocks (IDIC16 and ITIC) with adjustable photoelectric properties were developed. As the third component, ITIC building blocks with a larger π-conjugation structure, shorter solubilizing side chains, and red-shifted absorption spectrum were incorporated into an IDIC16-based nonconjugated copolymer acceptor PF1-TS4, which built up the terpolymers with two conjugated building blocks linked by flexible thioalkyl chain-thiophene segments. With the increasing ITIC content, terpolymers show gradually broadened absorption spectra and slightly down-shifted lowest unoccupied molecular orbital levels. The active layer based on terpolymer PF1-TS4-60 with a 60% ITIC unit presents more balanced hole and electron mobilities, higher photoluminescence quenching efficiency, and improved morphology compared to those based on PF1-TS4. In all-polymer solar cells (all-PSCs), PF1-TS4-60, matched with a wide band gap polymer donor PM6, achieved a similar open-circuit voltage ( V oc ) of 0.99 V, a dramatically increased short-circuit current density ( J sc ) of 15.30 mA cm –2 , and fill factor (FF) of 61.4% compared to PF1-TS4 ( V oc = 0.99 V, J sc = 11.21 mA cm –2 , and FF = 55.6%). As a result, the PF1-TS4-60-based all-PSCs achieved a PCE of 9.31%, which is ∼50% higher than the PF1-TS4-based ones (6.17%). The results demonstrate a promising approach to develop high-performance nonconjugated terpolymer acceptors for efficient all-PSCs by means of ternary polymerization using two different A–D–A-structured fused-ring electron-deficient building blocks.

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Novel polymer acceptors achieving 10.18% efficiency for all-polymer solar cells

Cited by 23 publications

References 45 publications

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

Regioregularity-control of conjugated polymers: from synthesis and properties, to photovoltaic device applications

Nonconjugated Terpolymer Acceptors with Two Different Fused-Ring Electron-Deficient Building Blocks for Efficient All-Polymer Solar Cells

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