An efficient polymer acceptor with fluorinated linkers enables all polymer solar cells with an efficiency of 15.7%

Xiao, Haiqin; Lv, Junfang; Liu, Miao; Guo, Xia; Xia, Xinxin; Lu, Xinhui; Zhang, Maojie

doi:10.1039/d2ta09364b

Cited by 10 publications

(3 citation statements)

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“…[ 57‐58 ] As shown in Figure 2d, the device processed by the CN+TA treatments exhibits an exciton dissociation probability ( P diss ) value of 97.3% and a charge collection probability ( P coll ) value of 87.2%, while the as‐cast device shows lower values ( P diss = 94.7%, P coll = 73.5%). [ 59 ] These results indicate that the CN+TA device has more efficient exciton dissociation and charge collection efficiency, which can partially explain the improved J SC and FF in the corresponding devices. [ 60‐61 ] To further study the exciton dissociation and charge transfer behavior in blend films, the photoluminescence (PL) spectra of PBDB‐T or PNT pure film and blend films with/without CN+TA treatments were measured.…”

Section: Resultsmentioning

confidence: 94%

“…In principle, more trap‐assisted recombination is involved when the slope of V OC versus P light approaches 2 KT / q , where K is the Boltzmann constant and T is the temperature. [ 56,59 ] Figure 2e shows the smaller slope of the CN+TA‐based device (1.06 KT / q ) compared to that of as‐cast devices (1.14 KT / q ), indicating that trap‐assisted recombination is effectively suppressed in the corresponding blends, which can support better photovoltaic performance. The relationship between J SC and P light can be expressed as J SC ∝ P light S , where S is an index for the degrees of bimolecular recombination.…”

Section: Resultsmentioning

confidence: 99%

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π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

Xiao

Shi

et al. 2023

Chin. J. Chem.

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Comprehensive SummaryNarrow‐bandgap n‐type polymers are essential for advancing the development of all‐polymer solar cells (all‐PSCs). Herein, we developed a novel polymer acceptor PNT with π‐extended 2‐(3‐oxo‐2,3‐dihydro‐1H‐cyclopenta[b]naphthalen‐1‐ylidene) malononitrile (CPNM) end groups. Compared to commonly used 2‐(3‐oxo‐2,3‐dihydro‐1H‐cyclopenta[b]naphthalen‐1ylidene) malononitrile (IC) units, CPNM units have a further extended fused ring, providing the PNT polymer with extended absorption into the near‐IR region (903 nm) and exhibiting a narrow optical bandgap (1.37 eV). Furthermore, PNT exhibits a high electron mobility (6.79 × 10−4 cm2 V−1 S−1) and a relatively high‐lying lowest unoccupied molecular orbital (LUMO) energy level of −3.80 eV. When blended with PBDB‐T, all‐PSC achieves a power conversion efficiency (PCE) of 13.7% and a high short‐circuit current density (JSC) of 24.4 mA cm−2, mainly attributed to broad absorption (600‐900 nm) and efficient charge separation and collection. Our study provides a promising polymer acceptor for all‐PSCs and demonstrates that π‐extended CPNM units are important to achieve high‐performance for all‐PSCs.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

Xiao

Shi

et al. 2023

Chin. J. Chem.

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“…[ 47 ] Soon after, inspired by PY‐IT, various regio‐regular PMSAs have been designed and synthesized. [ 82‐88 ] Compared with most other PSMAs (regio‐random and regio‐regular), [ 89‐96 ] PY‐IT exhibits simpler synthetic pathways and controllability of the polymerization process. In this review article, we only discuss the widely used PY‐IT.…”

Section: Materials Design and Device Engineeringmentioning

confidence: 99%

PY‐IT, an Excellent Polymer Acceptor^†

Bai,

Liang,

Liu

et al. 2023

Chin. J. Chem.

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Comprehensive SummaryAll‐Polymer solar cells (all‐PSCs) have attracted considerable attention due to their inherent advantages over other types of organic solar cells, including superior optical and thermal stability, as well as exceptional mechanical durability. Recently, all‐PSCs have experienced remarkable advancements in device performance thanks to the invention of polymerized small‐molecule acceptors (PSMAs) since 2017. Among these PSMAs, PY‐IT has garnered immense interest from the scientific community due to its exceptional performance in all‐PSCs. In this review, we presented the design principles of PY‐IT and discussed the various strategies employed in device engineering for PY‐IT‐based all‐PSCs. These strategies include additive and interface engineering, layer‐by‐layer processing methods, meniscus‐assisted coating methods, and ternary strategy. Furthermore, this review highlighted several novel polymeric donor materials that are paired with PY‐IT to achieve efficient all‐PSCs. Lastly, we summarized the inspiring strategies for further advancing all‐PSCs based on PY‐IT. These strategies aim to enhance the overall performance and stability of all‐PSCs by exploring new materials, optimizing device architectures, and improving fabrication techniques. By leveraging these approaches, we anticipate significant progress in the development of all‐PSCs and their potential as a viable renewable energy source.This article is protected by copyright. All rights reserved.

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Improving Miscibility of Polymer Donor and Polymer Acceptor by Reducing Chain Entanglement for Realizing 18.64 % Efficiency All Polymer Solar Cells

Deng,

Xu,

Qiu

et al. 2024

Angewandte Chemie

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All‐polymer solar cells have experienced rapid development in recent years by the emergence of polymerized small molecular acceptors (PSMAs). However, the strong chain entanglements of polymer donors (PDs) and polymer acceptors (PAs) decrease the miscibility of the resulting polymer mixtures, making it challenging to optimize the blend morphology. Herein, we designed three PAs, namely PBTPICm‐BDD, PBTPICγ‐BDD and PBTPICF‐BDD, by smartly using a BDD unit as the polymerized unit to copolymerize with different Y‐typed non‐fullerene small molecular acceptors (NF‐SMAs), thus achieving a certain degree of distortion and giving the polymer system enough internal space to reduce the entanglements of the polymer chains. Such effects increase the chances of the PD being interspersed into the acceptor material, which improve the solubility between the PD and PA. The PBTPICγ‐BDD and PBTPICF‐BDD displayed better miscibility with PBQx‐TCl, leading to a well optimized morphology. As a result, high power conversion efficiencies (PCEs) of 17.50% and 17.17% were achieved for PBQx‐TCl:PBTPICγ‐BDD and PBQx‐TCl:PBTPICF‐BDD devices, respectively. With the addition of PYF‐T‐o as the third component into PBQx‐TCl:PBTPICγ‐BDD blend to further extend the absorption spectral coverage and finely tune microstructures of the blend morphology, a remarkable PCE of 18.64% was realized finally.

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An efficient polymer acceptor with fluorinated linkers enables all polymer solar cells with an efficiency of 15.7%

Abstract: Despite the significant progress of all-polymer solar cells (all-PSCs) in recent years, obtaining both high open-circuit voltage (VOC) and short-circuit current density (JSC) simultaneously has been a challenging issue. Herein,...

Cited by 10 publications

References 59 publications

π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

PY‐IT, an Excellent Polymer Acceptor^†

Improving Miscibility of Polymer Donor and Polymer Acceptor by Reducing Chain Entanglement for Realizing 18.64 % Efficiency All Polymer Solar Cells

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An efficient polymer acceptor with fluorinated linkers enables all polymer solar cells with an efficiency of 15.7%

Abstract: Despite the significant progress of all-polymer solar cells (all-PSCs) in recent years, obtaining both high open-circuit voltage (VOC) and short-circuit current density (JSC) simultaneously has been a challenging issue. Herein,...

Cited by 10 publications

References 59 publications

π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

π‐Extended End Groups Enable High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption

PY‐IT, an Excellent Polymer Acceptor†

Improving Miscibility of Polymer Donor and Polymer Acceptor by Reducing Chain Entanglement for Realizing 18.64 % Efficiency All Polymer Solar Cells

Contact Info

Product

Resources

About

PY‐IT, an Excellent Polymer Acceptor^†