Insight Into Designing High‐Performance Polythiophenes for Reduced Urbach Energy and Nonradiative Recombination in Organic Solar Cells

Sun, Zhe; Ma, Hayoung; Yang, Sangjin; Cho, Yongjoon; Lee, Seunglok; Park, Jaeyeong; Mai, Thi Le Huyen; Kim, Wonjun; Jeong, Seonghun; Kim, Seoyoung; Yang, Changduk

doi:10.1002/adfm.202403093

Cited by 3 publications

(1 citation statement)

References 64 publications

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“…33–38 This progress inspires further exploration into PTs. Nevertheless, the development of all-PSCs based on PTs has significantly lagged behind that of PSCs based on PTs:NF-SMA blends, 39–41 with relatively few studies conducted. Thus, conducting a comprehensive investigation of PTs is crucial for establishing a systematic framework and enhancing their suitability for all-PSCs.…”

Section: Introductionmentioning

confidence: 99%

Polythiophene and its derivatives for all-polymer solar cells

Bai,

Cheng,

Wang

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Polythiophene and its derivatives for all-polymer solar cells

Bai,

Cheng,

Wang

et al. 2024

J. Mater. Chem. A

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Improving Efficiency of Organic Photovoltaics by Manipulating Critical Concentration of Polymer in Bulk‐Heterojunction Solution

Luo,

Yang,

Lin

et al. 2024

Adv Funct Materials

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In the advancement of organic photovoltaics (OPV) toward scale‐up production, how to mitigate the batch instability of electron‐donating polymers originated from varied molecular weights remains a great challenge. By taking into consideration the relationship between the molecular weight of electron‐donating polymers and the relevant critical concentration (c*) of the solution, herein it is demonstrated that the aggregation behavior of the electron‐donating polymers can be tailored through manipulating c* of the polymer solution. It is interesting to note that the excessive aggregation in low‐molecular‐weight fractions can be circumvented while the favorable mixing ratio can be identified. By preparing the binary bulk heterojunction film under c*‐defined conditions for mixed‐molecular‐weight polymers, a notable power conversion efficiency of 19.1% for binary devices is achieved. Of particular importance is that a linear interrelation can be established between the c* for the maximum PCE and c* for the low‐molecular‐weight fraction aggregation, validating those straightforward spectra measurements can accurately and rationally guide the molecular weight mixing of photovoltaic donor polymers, thereby fully harnessing the potent driving force and affinity inherent to the low‐molecular‐weight fractions. These findings offer a straightforward and logical framework for addressing batch variability in the large‐scale production of high‐performance OPV devices.

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Isomerization Engineering of Solid Additives Enables Highly Efficient Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Active Layer

Miao,

Sun,

Zou

et al. 2024

Advanced Materials

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Morphology control is crucial in achieving high‐performance organic solar cells (OSCs) and remains a major challenge in the field of OSC. Solid additive is an effective strategy to fine‐tune morphology, however, the mechanism underlying isomeric solid additives on blend morphology and OSC performance is still vague and urgently requires further investigation. Herein, two solid additives based on pyridazine or pyrimidine as core units, M1 and M2, are designed and synthesized to explore working mechanism of the isomeric solid additives in OSCs. The smaller steric hindrance and larger dipole moment facilitate better π–π stacking and aggregation in M1‐based active layer. The M1‐treated all‐small‐molecule OSCs (ASM OSCs) obtain an impressive efficiency of 17.57%, ranking among the highest values for binary ASM OSCs, with 16.70% for M2‐treated counterparts. Moreover, it is imperative to investigate whether the isomerization engineering of solid additives works in state‐of‐the‐art polymer OSCs. M1‐treated D18‐Cl:PM6:L8‐BO‐based devices achieve an exceptional efficiency of 19.70% (certified as 19.34%), among the highest values for OSCs. The work provides deep insights into the design of solid additives and clarifies the potential working mechanism for optimizing the morphology and device performance through isomerization engineering of solid additives.

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Insight Into Designing High‐Performance Polythiophenes for Reduced Urbach Energy and Nonradiative Recombination in Organic Solar Cells

Cited by 3 publications

References 64 publications

Polythiophene and its derivatives for all-polymer solar cells

Polythiophene and its derivatives for all-polymer solar cells

Improving Efficiency of Organic Photovoltaics by Manipulating Critical Concentration of Polymer in Bulk‐Heterojunction Solution

Isomerization Engineering of Solid Additives Enables Highly Efficient Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Active Layer

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