Naphthalenothiophene imide-based polymer exhibiting over 17% efficiency

Zhang, Gongya; Ning, Haijun; Chen, Hui; Jiang, Qiuju; Jiang, Jiaquan; Han, Pengwei; Dang, Li; Xu, Minghui; Shao, M.; He, Feng; Wu, Qinghe

doi:10.1016/j.joule.2021.02.003

Cited by 73 publications

(50 citation statements)

References 55 publications

(83 reference statements)

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“…Organic solar cells (OSCs) have been regarded as a promising new photovoltaic technology due to their advantages of mechanical flexibility, low cost, and ease of fabrication, hence attracting considerable attention in the past decades. [1][2][3] Benefitting from the in-depth investigations on efficient photovoltaic materials, [4][5][6] device optimization, [7,8] and interfacial engineering, [9] the state-of-the-art bulk-heterojunction (BHJ) OSCs based on small-molecule acceptors and polymer donors have progressed rapidly with impressive power conversion efficiencies (PCEs) exceeding 18 %. [10][11][12] In recent years, the emergence of fused-ring non-fullerene acceptors (NFAs) has played a key role in the development of OSCs, especially those with the structures based on the laddertype electron-deficient fused ring as central core and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) as end groups, such as ITIC, [13] IT-4F, [14] Y6, [15] and its derivatives.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Random Copolymerization Strategy for Host Polymer Donor PM6 Enables Improved Efficiency Both in Binary and Ternary Organic Solar Cells

et al. 2022

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Although breakthroughs have been made in organic solar cells (OSCs) in recent years, the power conversion efficiency (PCE) of OSCs still lags behind inorganic/perovskite solar cells. In this work, two terpolymers were synthesized by introducing the thieno[3,4‐c]pyrrole‐4,6‐(5H)‐dione (TPD) block into the host polymer donor PM6. Owing to the lower highest occupied molecular orbital energy level, wider light absorption, optimal molecular packing, and more desirable aggregation morphology by addition of the TPD, the PM6‐TPD‐5 % : Y6‐based device displayed an improved PCE of 16.3 % with an enhanced open‐circuit voltage (VOC) of 0.860 V, relative to that of PM6‐TPD‐10 % : Y6 (PCE=14.8 %) and PM6 : Y6‐based device (PCE=15.6 %). Interestingly, the VOC did not always increase in proportion to the third component. Besides, ternary OSCs based on PM6 : PM6‐TPD‐5 % : Y6 achieved a superior PCE of 17.1 %. This work demonstrated that random copolymerization is a feasible and effective strategy to further increase device performance, and the two polymers that possess similar structure and absorption in ternary devices can also obtain impressive efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Random Copolymerization Strategy for Host Polymer Donor PM6 Enables Improved Efficiency Both in Binary and Ternary Organic Solar Cells

et al. 2022

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“…In recent years, PCE of the PSCs has increased quickly, which is mainly benefitted from the development of the narrow bandgap SMAs [ 10–17 ] and the wide bandgap conjugated polymer donors. [ 18–25 ] Especially, the emergence of the A‐DA'D‐A structured SMA Y6 developed by Zou et al, [ 8,12 ] greatly improved the PCE of the PSCs to over 17–18% [ 26–28 ] recently.…”

Section: Introductionmentioning

confidence: 99%

Introducing Low‐Cost Pyrazine Unit into Terpolymer Enables High‐Performance Polymer Solar Cells with Efficiency of 18.23%

Zhou

Meng

Zhang

et al. 2021

Adv Funct Materials

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Recently, a random ternary copolymerization strategy has become a promising and efficient approach to develop high‐performance polymer donors for polymer solar cells (PSCs). In this study, a low‐cost electron‐withdrawing unit, 2,5‐bis(4‐(2‐ethylhexyl)thiophen‐2‐yl)pyrazine (PZ‐T), is incorporated into the polymer backbone of PM6 as the third component, and three D‐A1‐D‐A2 type terpolymers PMZ‐10, PMZ‐20, and PMZ‐30 are synthesized by the random copolymerization strategy, with the PZ‐T proportion of 10%, 20%, and 30%, respectively. The terpolymers exhibit downshifted highest occupied molecular orbital energy levels than PM6, which is beneficial for obtaining higher open‐circuit voltage (Voc) of the PSCs with the polymer as a donor. Importantly, the PSCs based on PMZ‐10:Y6 demonstrate efficient exciton dissociation, higher and balanced electron/hole mobilities, desirable aggregation, and high power conversion efficiency of 18.23%, which is the highest efficiency among the terpolymer‐based PSCs so far. The results indicate that the ternary copolymerization strategy with PZ‐T as the second A‐unit is an efficient approach to further improve the photovoltaic performance and reduce the synthetic cost of the D‐A copolymer donors.

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“…To overcome this issue, researchers have studied topics 5 in the fields of molecular design, morphology control, and interfacial device engineering. [31][32][33][34] For instance, J. Song et al synthesised a p-type PT2 copolymer; the PT2:NFA blend-based OSCs exhibited long-term stability because PT2 copolymers create an interpenetrating fibrillar network, which remains unchanged over time.…”

Section: Introductionmentioning

confidence: 99%

Impact of symmetry-breaking of non-fullerene acceptors for efficient and stable organic solar cells

et al. 2021

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Naphthalenothiophene imide-based polymer exhibiting over 17% efficiency

Cited by 73 publications

References 55 publications

Random Copolymerization Strategy for Host Polymer Donor PM6 Enables Improved Efficiency Both in Binary and Ternary Organic Solar Cells

Random Copolymerization Strategy for Host Polymer Donor PM6 Enables Improved Efficiency Both in Binary and Ternary Organic Solar Cells

Introducing Low‐Cost Pyrazine Unit into Terpolymer Enables High‐Performance Polymer Solar Cells with Efficiency of 18.23%

Impact of symmetry-breaking of non-fullerene acceptors for efficient and stable organic solar cells

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