A monothiophene unit incorporating both fluoro and ester substitution enabling high-performance donor polymers for non-fullerene solar cells with 16.4% efficiency

Sun, Huiliang; Liu, Tao; Yu, Jianwei; Lau, Tsz‐Ki; Zhang, Guangye; Zhang, Yujie; Su, Mengyao; Tang, Yumin; Ma, Ruijie; Liu, Bin; Liang, Jiaen; Feng, Kui; Lu, Xinhui; Guo, Xugang; Gao, Feng; Yan, He

doi:10.1039/c9ee01890e

Cited by 342 publications

(241 citation statements)

References 59 publications

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“…The OPVs based on polymer donor PM6 and acceptor Y6 exhibited an outstanding PCE of 15.7%. And state‐of‐the‐art PCEs of over 16% have been achieved with single‐junction solar cells based on Y6 and its derivatives . Besides, semitransparent polymer solar cells based on PM6:Y6 with PCE of over 12% and AVT of over 18% have also been demonstrated .…”

Section: Nir Photoelectric Materials For Opvsmentioning

confidence: 99%

Near‐infrared organic photoelectric materials for light‐harvesting systems: Organic photovoltaics and organic photodiodes

Xie

Chen

Ying

et al. 2019

InfoMat

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The inherent advantages of organic optoelectronic materials endow lightharvesting systems, including organic photovoltaics (OPVs) and organic photodiodes (OPDs), with multiple advantages, such as low-cost manufacturing, light weight, flexibility, and applicability to large-area fabrication, make them promising competitors with their inorganic counterparts. Among them, nearinfrared (NIR) organic optoelectronic materials occupy a special position and have become the subject of extensive research in both academia and industry.The introduction of NIR materials into OPVs extends the absorption spectrum range, thereby enhancing the photon-harvesting ability of the devices, due to which they have been widely used for the construction of semitransparent solar cells with single-junction or tandem architectures. NIR photodiodes have tremendous potential in industrial, military, and scientific applications, such as remote control of smart electronic devices, chemical/biological sensing, environmental monitoring, optical communication, and so forth. These practical and potential applications have stimulated the development of NIR photoelectric materials, which in turn has given impetus to innovation in light-harvesting systems. In this review, we summarize the common molecular design strategies of NIR photoelectric materials and enumerate their applications in OPVs and OPDs. K E Y W O R D Snear infrared, organic optoelectronic materials, organic photodiodes, organic photovoltaics

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Section: Nir Photoelectric Materials For Opvsmentioning

confidence: 99%

Near‐infrared organic photoelectric materials for light‐harvesting systems: Organic photovoltaics and organic photodiodes

Xie

Chen

Ying

et al. 2019

InfoMat

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“…Their easily‐tailored chemical structures allow judicious optimization of optical properties, energy levels and crystallization/aggregation properties . The power conversion efficiencies (PCEs) of OSCs have grown rapidly in the past two decades: from an initial PCE of 1% to more than 16% nowadays in single‐junction devices . Though continuous progression on developing SMAs has enabled high‐performance OSCs, there are still several critical issues need to be overcome for the purpose of practical applications .…”

Section: Introductionmentioning

confidence: 99%

Thick‐Film Organic Solar Cells Achieving over 11% Efficiency and Nearly 70% Fill Factor at Thickness over 400 nm

Gao

Hao

et al. 2020

Adv Funct Materials

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Thickness‐insensitive small molecule acceptors (SMAs) are still a great challenge for developing thick‐film organic solar cells (OSCs) towards practical use. Herein, two SMAs, MF1 and MF2, are designed and synthesized by employing a bifunctional end group with fluorine and methyl moieties. Combined with fused‐ring cores with alkyl side chains, both MF1 and MF2 exhibit ordered π–π stacking and high charge carrier mobilities in neat and blend films. The champion devices based on PM7:MF1 and PM7:MF2 deliver high power conversion efficiencies (PCEs) of 12.4% and 13.7%, and high fill factors (FFs) of 78.3% and 74.5%, respectively. With increasing active layer thickness, the FFs of the OSCs decrease relatively slowly, demonstrating the preferrable properties of MF1 and MF2 in terms of their thickness insensitivity, especially for MF1. As a result, the two thick‐film OSCs achieve over 11% PCEs at an active layer thickness over 400 nm (an FF close to 70% for PM7:MF1) and over 10% PCEs when the thickness is increased up to 500 nm. These are the highest PCEs among OSCs with such active layer thicknesses to date. This work reveals a molecular design strategy by reasonably combining fluorine and methyl together to simultaneously enhance charge carrier mobilities and fine‐tune the morphology, which is beneficial to achieve high‐performance thick‐film OSCs.

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“…In this contribution, we designed hepta‐ring and octa‐ring asymmetric SMAs (IDTP‐4F and IDTTP‐4F) by incorporating DTP into IDT and IDTT, which forms S‐shape and C‐shape conformation, respectively, as shown in Figure a. Three high‐performance polymer donors (PM6, [ 36 ] S1, [ 37 ] and PM7 [ 38 ] ) were chosen to confirm the universality of the relationship between conformation and photovoltaic performance. Consequently, the PM7: IDTP‐4F system achieves PCE as high as 15.2%, with an open‐circuit voltage ( V OC ) of 0.903 V, a short‐circuit current density ( J SC ) of 22.5 mA cm −2 and an FF of 74.6%, while that of PM7: IDTTP‐4F only gave a PCE of 13.8%.…”

Section: Introductionmentioning

confidence: 99%

Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

Guo

et al. 2020

Adv Funct Materials

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The prosperous period of polymer solar cells (PSCs) has witnessed great progress in molecule design methods to promote power conversion efficiency (PCE). Designing asymmetric structures has been proved effective in tuning energy level and morphology, which has drawn strong attention from the PSC community. Two hepta-ring and octa-ring asymmetric small molecular acceptors (SMAs) (IDTP-4F and IDTTP-4F) with S-shape and C-shape confirmations are developed to study the relationship between conformation shapes and PSC efficiencies. The similarity of absorption and energy levels between two SMAs makes the conformation a single variable. Additionally, three wide-bandgap polymer donors (PM6, S1, and PM7) are chosen to prove the universality of the relationship between conformation and photovoltaic performance. Consequently, the champion PCE afforded by PM7: IDTP-4F is as high as 15.2% while that of PM7: IDTTP-4F is 13.8%. Moreover, the S-shape IDTP-4F performs obviously better than their IDTTP-4F counterparts in PSCs regardless of the polymer donors, which confirms that S-shape conformation performs better than the C-shape one. This work provides an insight into how conformations of asymmetric SMAs affect PCEs, specific functions of utilizing different polymer donors to finely tune the active-layer morphology and another possibility to reach an excellent PCE over 15%.

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A monothiophene unit incorporating both fluoro and ester substitution enabling high-performance donor polymers for non-fullerene solar cells with 16.4% efficiency

Abstract: Both fluorine and ester substituted monothiophene yielded a novel thiophene derivative FE-T. The resulting polymer donor S1 enabled single-junction non-fullerene solar cell with over 16% efficiency.

Cited by 342 publications

References 59 publications

Near‐infrared organic photoelectric materials for light‐harvesting systems: Organic photovoltaics and organic photodiodes

Near‐infrared organic photoelectric materials for light‐harvesting systems: Organic photovoltaics and organic photodiodes

Thick‐Film Organic Solar Cells Achieving over 11% Efficiency and Nearly 70% Fill Factor at Thickness over 400 nm

Over 15% Efficiency Polymer Solar Cells Enabled by Conformation Tuning of Newly Designed Asymmetric Small‐Molecule Acceptors

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