Research Advances of Nonfused Ring Acceptors for Organic Solar Cells

Yu, Runnan; Li, Shuang; Yuan, Haoyu; Yang, Zongzhi; Jin, Shengli; Tan, Zhan’ao

doi:10.1021/acs.jpclett.4c00153

Cited by 5 publications

(1 citation statement)

References 110 publications

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“…Last but not least is the cost. 32,33 At present, one of the potential bottlenecks for the industrialization and large-scale application of OSCs is the cost, especially the cost of active layer materials, 34,35 which is affected by two main factors, namely tedious synthetic methods and high-cost raw materials. Polymer donors are mainly composed of alternating electron-deficient units and electron-rich units, which usually have a complex fused-ring structure and synthesis process, leading to excessive production costs.…”

Section: Introductionmentioning

confidence: 99%

Cost-effective polymer donors with simple structure for organic solar cells

Zhou,

Gu,

Zheng

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Cost-effective polymer donors with simple structure for organic solar cells

Zhou,

Gu,

Zheng

et al. 2024

J. Mater. Chem. A

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Non‐fused Nonfullerene Acceptors with an Asymmetric Benzo[1,2‐b:3,4‐b′, 6,5‐b”]trithiophene (BTT) Donor Core and Different AcceptorTerminal Units for Organic Solar Cells

Khokhlov,

Keshtov,

Shikin

et al. 2024

Chemistry A European J

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Here in, we have designed two new unfused non‐fullerene small molecules based on asymmetric benzo[1,2‐b:3.4‐b', 6,5‐b"]trithiophene (BTT) central donor core and different terminal units, i.e. 2‐(3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene)malononitrile (NFA‐4) and 1,3‐diethyl‐2‐thioxodi hydropyrimidine‐4,6(1H,5H)‐dione (NFA‐5) and their optical and electrochemical properties were investigated. Employing a wide band‐gap copolymer D18, the binary D18: NFA‐4 and D18:NFA‐5 bulk heterojunction‐based organic solar cells realized an overall power conversion efficiency of about 17.07% and 11.27 %, respectively. The higher value of power conversion efficiency for the NFA‐4‐based organic solar cells, as compared to the NFA‐5 counterpart, is attributed to the enhanced values of short circuit current, open circuit voltage, and fill factor. After the incorporation of NFA‐5 into the binary bulk heterojunction D18:NFA‐4, the ternary organic solar cells attained a power conversion efficiency of 18.05 %, which is higher than that for the binary counterparts and attributed to the increased values of short circuit current, fill factor, and open circuit voltage. The increased value of short circuit current is associated with the effective utilization of excitons through the energy transfer from the NFA‐5 to NFA‐4 as the NFA‐4 exhibits a more significant dipole moment than the NFA‐5 and is effectively dissociated into a free charge carrier.

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Fully Non‐Fused Ring Electron Acceptors Enable Effective Additive‐Free Organic Solar Cells with Enhanced Exciton Diffusion Length

Li,

Liu,

Zhong

et al. 2024

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Low‐cost photovoltaic materials and additive‐free, non‐halogenated solvent processing of photoactive layers are crucial for the large‐scale commercial application of organic solar cells (OSCs). However, high‐efficiency OSCs that possess all these advantages remain scarce due to the lack of insight into the structure‐property relationship. In this work, three fully non‐fused ring electron acceptors (NFREAs), DTB21, DTB22, and DTB23, are reported by utilizing a simplified 1,4‐di(thiophen‐2‐yl)benzene (DTB) core with varied alkoxy chain lengths on the thiophene bridge. The material‐only costs of these acceptors are only 11–13$ per gram. Importantly, DTB22 has an exciton diffusion length (LD) of up to 25.5 nm. The DTB21 and DTB23 exhibit decreased LDs of 20.1 and 23.1 nm, respectively. After blending with the polymer donor PBQx‐TF, the PBQx‐TF:DTB22 film exhibits the fastest hole transfer and the longest carrier recombination lifetime among these OSCs. Consequently, the optimal PBQx‐TF:DTB22‐based OSC achieves an excellent PCE of 17.00%, which is among the highest values for fully NFREAs. In contrast, the PBQx‐TF:DTB21‐ and PBQx‐TF:DTB23‐based OSCs show relatively lower PCEs of 15.13% and 15.63%, respectively. Notably, all these OSCs are fabricated using toluene as the solvent, without any additives. Additionally, the DTB22‐based OSC also demonstrates good stability, retaining 95% of its initial efficiency after 500 h without encapsulation in a glovebox.

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Research Advances of Nonfused Ring Acceptors for Organic Solar Cells

Cited by 5 publications

References 110 publications

Cost-effective polymer donors with simple structure for organic solar cells

Cost-effective polymer donors with simple structure for organic solar cells

Non‐fused Nonfullerene Acceptors with an Asymmetric Benzo[1,2‐b:3,4‐b′, 6,5‐b”]trithiophene (BTT) Donor Core and Different AcceptorTerminal Units for Organic Solar Cells

Fully Non‐Fused Ring Electron Acceptors Enable Effective Additive‐Free Organic Solar Cells with Enhanced Exciton Diffusion Length

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