The first thieno[3,4-b]pyrazine based small molecular acceptor with a linear A2–A1–D–A1–A2 skeleton for fullerene-free organic solar cells with a high Voc of 1.05 V

Li, Jianfeng; Yang, Jing; Hu, Jie; You, Chen; Xiao, Bo; Zhou, Erjun

doi:10.1039/c8cc06198j

Cited by 22 publications

(12 citation statements)

References 52 publications

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“…better photovoltaic performance (PCE = 4.91%) when paired with one of the state-of-the-art polymer donors, PTB7-Th (Scheme 1). Furthermore, Li et al [63] synthesized another new RD-based acceptor (TP21, Scheme 2, Table 1) containing a thienopyrazine (TP) πconjugated bridge instead of the commonly used BT unit. Compared with FBR, TP21 showed a decreased optical bandgap of 1.65 eV, but a high-lying LUMO level of −3.61 eV, due to the highly planar and quinoid structure of TP unit that could facilitate the electron delocalization.…”

Section: Nfas With a Tricyclic Electron-rich Corementioning

confidence: 99%

Rhodanine-based nonfullerene acceptors for organic solar cells

Liu¹,

Li²,

Zhao

2019

Sci. China Mater.

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Significant progress on the development of nonfullerene acceptors (NFAs) for organic solar cells (OSCs) has been made in the past several years, and the power conversion efficiency (PCE) exceeding 17% has been already realized based on a tandem non-fullerene device. To date, NFAs with a linearly fused acceptor-donor-acceptor (A-D-A) structure are of great interest, due to their attracting synthetic flexibility and high photovoltaic performance. Rhodanine is one of the most studied electron-withdrawing moieties to construct such AD A type NFAs, and the resulting single-junction OSCs have produced PCEs of~10%. More interestingly, those rhodanine-based NFAs have demonstrated a particularly excellent compatibility with well-known P3HT donor, enabling respectable PCEs over 7%. Thus in this review, we summarize the important advances on rhodanine-based NFAs with a main focus on discussing the molecular design strategies, providing a better understanding of the structure-property relationship for those rhodanine-based NFAs.

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Section: Nfas With a Tricyclic Electron-rich Corementioning

confidence: 99%

Rhodanine-based nonfullerene acceptors for organic solar cells

Liu¹,

Li²,

Zhao

2019

Sci. China Mater.

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“…[7][8][9][10] Small molecules have possessed exceptional advantages such as easy synthesis, fixed molecular weight, precise molecular structure, and highlevel purity. [11][12][13][14] However, polymers possessed wide molecular-weight distribution and low purity. [15,16] Solubility of small molecules is higher than polymers due to lower molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Machine‐Learning Analysis of Small‐Molecule Donors for Fullerene Based Organic Solar Cells

et al. 2022

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In recent years, development in organic solar cells speeds up and performance continuously increases. From the last few years, machine learning gains fame among scientists who are researching on organic solar cells. Herein, machine learning is used to screen the small‐molecule donors for organic solar cells. Molecular descriptors are used as input to train machine models. A variety of machine‐learning models are tested to find the suitable one. Random forest model shows best predictive capability (Pearson's coefficient = 0.93). New small‐molecule donors are also designed from easily synthesizable building units. Their power conversion efficiencies (PCEs) are predicted. Potential candidates with PCE > 11% are selected. The approach presented herein helps to select the efficient materials in short time with ease.

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“…As shown in our previous works, choosing the same electron-accepting unit (A) to structure both donor and acceptor materials, namely, the “Same-A-Strategy” (SAS), can decrease the energy offsets of the lowest unoccupied molecular orbital (LUMO) or highest occupied molecular orbital (HOMO) levels between the donor and acceptor (Δ E LUMO and Δ E HOMO ) and thus improve the V OC . − We used benzotriazole (BTA) to construct a series of photovoltaic materials and obtain many high-voltage OSCs with the highest PCE of over 11%. For example, BTA5 blended with J52-F afforded a striking V OC of 1.17 V with an exciting PCE of 11.27% .…”

Section: Introductionmentioning

confidence: 99%

Fluorination of the Quinoxaline-Based p-Type Polymer and n-Type Small Molecule for High V_OC Organic Solar Cells

et al. 2021

J. Phys. Chem. C

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The “Same-A-Strategy” (SAS) employing the same acceptor unit (A) to construct both donor and acceptor materials was effective to achieve high open-circuit voltage (V OC) but only confined to the benzotriazole (BTA) unit. In this work, we chose quinoxaline (Qx) instead of BTA as the A unit to construct photovoltaic materials and extended the application of the SAS. By introducing the fluorine atom to the thiophene side chains of the p-type polymer and Qx units of the n-type small molecule, the optoelectronic properties can be effectively fine-tuned. The photovoltaic device based on PE61:Qx3b achieved a power conversion efficiency (PCE) of 8.24% with a V OC of 1.02 V. After fluorination of the n-type material, the PE61:F-Qx3b-based device achieved an improved PCE of 10.45% with a medium V OC of 0.98 V owing to the stronger π–π stacking, more matched energy levels, and suppressed bimolecular recombination. Further fluorination of the p-type material, the PE62:F-Qx3b-based device obtained a V OC as high as 1.09 V while achieving a slightly high PCE at 9.78% based on the Qx unit with a very high V OC. These four devices maintain a high V OC around 1.0 V with a low energy loss from 0.57 to 0.71 eV. Our results indicate that the Qx unit is also appropriate for the SAS to attain high-voltage solar cells, and fluorination is helpful to promise performance.

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The first thieno[3,4-b]pyrazine based small molecular acceptor with a linear A₂–A₁–D–A₁–A₂ skeleton for fullerene-free organic solar cells with a high V_oc of 1.05 V

Cited by 22 publications

References 52 publications

Rhodanine-based nonfullerene acceptors for organic solar cells

Rhodanine-based nonfullerene acceptors for organic solar cells

Machine‐Learning Analysis of Small‐Molecule Donors for Fullerene Based Organic Solar Cells

Fluorination of the Quinoxaline-Based p-Type Polymer and n-Type Small Molecule for High V_OC Organic Solar Cells

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The first thieno[3,4-b]pyrazine based small molecular acceptor with a linear A2–A1–D–A1–A2 skeleton for fullerene-free organic solar cells with a high Voc of 1.05 V

Cited by 22 publications

References 52 publications

Rhodanine-based nonfullerene acceptors for organic solar cells

Rhodanine-based nonfullerene acceptors for organic solar cells

Machine‐Learning Analysis of Small‐Molecule Donors for Fullerene Based Organic Solar Cells

Fluorination of the Quinoxaline-Based p-Type Polymer and n-Type Small Molecule for High VOC Organic Solar Cells

Contact Info

Product

Resources

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The first thieno[3,4-b]pyrazine based small molecular acceptor with a linear A₂–A₁–D–A₁–A₂ skeleton for fullerene-free organic solar cells with a high V_oc of 1.05 V

Fluorination of the Quinoxaline-Based p-Type Polymer and n-Type Small Molecule for High V_OC Organic Solar Cells