Enhancing the Performance of Organic Solar Cells by Prolonging the Lifetime of Photogenerated Excitons

Guo, Qingxin; Liu, Yahui; Liu, Ming; Zhang, Hao; Qian, Xiquan; Yang, Junfeng; Wang, Jing; Xue, Wenyue; Zhao, Qian; Xu, Xinjun; Ma, Wei; Tang, Zheng; Li, Yunliang; Bo, Zhishan

doi:10.1002/adma.202003164

Cited by 45 publications

(36 citation statements)

References 52 publications

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“…[ 42 ] Furthermore, the photoluminescence (PL) spectrum of MBTI is partially covered by the absorption spectrum of L15 (Figure S6a, Supporting Information), implying a possible energy transfer process between two polymer acceptors. [ 43 ] To verify this, the PL spectra of L15 and MBTI neat films, as well as L15:MBTI‐blend films, were measured at the excitation wavelength of 532 nm. As presented in Figure S6b, Supporting Information, the higher PL intensity was observed in the blend films than that of L15 and MBTI neat films while the PL peak of MBTI was absent in the blend, suggesting that there occurs an efficient energy transfer process from MBTI to L15.…”

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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“…[137][138][139][140] The compatibility of materials will inuence the intermolecular distance in blend lms; the small intermolecular distance will be conducive to the occurrence of the dynamic process to improve the exciton utilization through energy or charge transfer. 141,142 Wang et al designed a novel molecule DR3TBDTT-E and fabricated ternary SMPVs based on donors DR3TBDTT (M1) and DR3TBDTT-E (M2) and acceptor PC 71 BM. 143 The ternary SMPVs with an optimized weight ratio (0.9 : 0.1 : 0.8, wt/wt/wt) exhibited PCEs of 8.48% under the as-cast conditions and 10.26% under TA + SVA (TSA) treatments.…”

Section: Ternary Smpvs Based On Two Donorsmentioning

confidence: 99%

Recent progress in all-small-molecule organic photovoltaics

Zhao

Yang

et al. 2022

J. Mater. Chem. A

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“…The photoluminescence (PL) characteristics of the neat acceptor films and the PL quenching behaviors for the blend films are closely related to exciton dissociation and charge transfer process of the active layer. [ 21a,25 ] Consequently, the PL and PL quenching behaviors of these four acceptors were examined together with PBDB‐T as the polymer donor. As shown in Figure 1d, the neat 4T‐1 film had weak and broad emission ranging from 750 to 1100 nm with an emission maximum located at 926 nm.…”

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Organic Solar Cells Based on a Low‐Cost Fully Non‐Fused Electron Acceptor

Zhou

Lü

et al. 2021

Adv Funct Materials

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108

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A series of tetrathiophene‐based fully non‐fused ring acceptors (4T‐1, 4T‐2, 4T‐3, and 4T‐4), which can be paired with the star donor polymer PBDB‐T to fabricate highly efficient organic solar cells are developed. Tailoring the size of lateral chains can tune the solubility and packing mode of acceptor molecules in neat and blend films. It is found that the incorporation of 2‐ethylhexyl chains can effectively change the compatibility with the donor polymer PBDB‐T, and an encouraging power conversion efficiency of 10.15% is accomplished by 4T‐3‐based organic solar cells. It also presents good compatibility with the other polymer donor and an even higher power conversion efficiency (PCE) of 12.04% is achieved based on D18:4T‐3 blend, which is the champion PCE for the fully non‐fused acceptors. Importantly, these inexpensive tetrathiophene fully non‐fused ring acceptors provide cost‐effective photovoltaic performance. The results demonstrate a high photovoltaic performance from synthetically inexpensive materials could be achieved by the rational design of non‐fused ring acceptor molecules.

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Enhancing the Performance of Organic Solar Cells by Prolonging the Lifetime of Photogenerated Excitons

Cited by 45 publications

References 52 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

Recent progress in all-small-molecule organic photovoltaics

High‐Efficiency Organic Solar Cells Based on a Low‐Cost Fully Non‐Fused Electron Acceptor

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