High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having π-Extended Units with Broad Near-IR Absorption

Su, Ning; Ma, Ruijie; Li, Guoping; Liu, Tao; Feng, Liang; Lin, Chenjian; Chen, Jianhua; Song, Jun; Xiao, Yiqun; Qu, Junle; Lu, Xinhui; Sangwan, Vinod K.; Hersam, Mark C.; Yan, He; Facchetti, Antonio; Marks, Tobin J.

doi:10.1021/acsenergylett.1c00009

Cited by 77 publications

(58 citation statements)

References 56 publications

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“…It is well known that the relatively low J sc (normally <25 mA cm À2 ) and large E loss (>0.55 eV) are the prominent factors that restrict the current PCE of all-PSCs compared to the record-high SMAs-based PSCs, which have the impressive J sc s (~29 mA cm À2 ). 35,36 Therefore, further effort will be required to boost the desired light absorption in the near-infrared (NIR) region to enhance J sc in all-PSCs. Therefore, several molecular design strategies are analyzed as follows to provide insights for the future development of PSMAs: (a) Core fused-ring optimization.…”

Section: Design Of Psmasmentioning

confidence: 99%

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Kong

Yuan

et al. 2022

InfoMat

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All-polymer solar cells (all-PSCs) have received attention due to their morphological stability under thermal and mechanical stresses. Currently, the highest reported power conversion efficiency of all-PSCs is over 17%, achieved by utilizing polymerized small molecular acceptors (PSMAs). However, the need for higher regiospecificity to avoid forming isomers during polymerization of SMAs still challenges the further applications of all-PSCs. From this perspec-

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Section: Design Of Psmasmentioning

confidence: 99%

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Kong

Yuan

et al. 2022

InfoMat

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“…Very recently, the PCEs of all‐PSCs have been increased up to over 14% mainly via the optimization of FREA structures (Figure S1 and Table S1, Supporting Information). [ 22–26 ]…”

Section: Introductionmentioning

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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“…In comparison of the synthetic steps and costs of nearly 50 photovoltaic materials reported in literatures (Figure 1), it could be found that the synthesis steps of the high‐efficiency polymer materials except PTQ10 are as high as 15 steps or more (such as for PTzBI‐dF [ 29 ] and PYN‐BDTF [ 30 ] ), and the cost calculation [ 23 ] shows that the combined cost even exceeds ¥1000 per gram. In comparison with the polymer donors, the synthesis steps of most small‐molecule donors are less (about 10 steps), and the synthesis cost is lower (within ¥600 per gram).…”

Section: Introductionmentioning

confidence: 99%

15.71% Efficiency All‐Small‐Molecule Organic Solar Cells Based on Low‐Cost Synthesized Donor Molecules

Guo

Qiu

Yang

et al. 2021

Adv Funct Materials

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Low cost, high efficiency, and high stability are the three key issues of organic solar cells (OSCs) that should be carefully considered to meet the requirement of future commercial applications. Therefore, the development of high-performance organic photovoltaic materials with low synthetic cost has been becoming a crucial challenge in the field of OSCs. Herein, two new low-cost small-molecule donors (SM-BF1 and SM-BF2) are designed and synthesized with a facile synthetic route by replacing 4-bromo-2-fluorobenzenethiol and 4-bromo-3-fluorobenzenethiol with lowcost 4-bromo-2-fluoro-1-iodobenzene and 4-bromo-3-fluoro-1-iodobenzene as key raw materials. Besides, the influence of the chemical steric effect of the phenyl conjugated side chains of the benzodithiophene (BDT) unit on photophysical properties, charge transfer, and photovoltaic properties are deeply investigated by the modulation of fluorine atom substituted position. As a result, SM-BF1 with ortho-fluorinated substituent has outstanding crystallization properties and better miscibility with acceptor Y6 and exhibits more desirable morphology and more balanced chargecarrier transport properties, leading to a superior power conversion efficiency (PCE) to 15.71%. More encouragingly, according to the figure of merit (FOM) and the industrial figure of merit (i-FOM) to evaluate the small-molecule donors, the SM-BF1-based device has excellent potential for future commercial applications.

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High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having π-Extended Units with Broad Near-IR Absorption

Cited by 77 publications

References 56 publications

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

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

15.71% Efficiency All‐Small‐Molecule Organic Solar Cells Based on Low‐Cost Synthesized Donor Molecules

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