Random terpolymer based on thiophene-thiazolothiazole unit enabling efficient non-fullerene organic solar cells

Wu, Jiada; Li, Guangwei; Fang, Jin; Guo, Xia; Zhu, Lei; Guo, Bing; Wang, Yulong; Zhang, Guangye; Arunagiri, Lingeswaran; Liu, Feng; Yan, He; Zhang, Maojie; Li, Yongfang

doi:10.1038/s41467-020-18378-9

Cited by 241 publications

(201 citation statements)

References 56 publications

(61 reference statements)

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“…Hence, polymer solar cells (PSCs), composed of a polymer donor and a small‐molecule acceptor, represent the state of the art. [ 7–13 ] However, batch‐to‐batch variations in conjugated polymer synthesis in terms of purity and molecular weight distribution are almost inevitable and limit the reproducibility of PSCs, hindering progress toward technology development and commercialization. [ 14–17 ] Small‐molecule donors with their advantages of a well‐defined molecular weight and easy purification suffer less from batch‐to‐batch variations and provide a possible solution to overcome this issue.…”

Section: Introductionmentioning

confidence: 99%

Efficient Electron Transport Layer Free Small‐Molecule Organic Solar Cells with Superior Device Stability

Bin

Wang

et al. 2021

Advanced Materials

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Electron transport layers (ETLs) placed between the electrodes and a photoactive layer can enhance the performance of organic solar cells but also impose limitations. Most ETLs are ultrathin films, and their deposition can disturb the morphology of the photoactive layers, complicate device fabrication, raise cost, and also affect device stability. To fully overcome such drawbacks, efficient organic solar cells that operate without an ETL are preferred. In this study, a new small‐molecule electron donor (H31) based on a thiophene‐substituted benzodithiophene core unit with trialkylsilyl side chains is designed and synthesized. Blending H31 with the electron acceptor Y6 gives solar cells with power conversion efficiencies exceeding 13% with and without 2,9‐bis[3‐(dimethyloxidoamino)propyl]anthra[2,1,9‐def:6,5,10‐d′e′f ′]diisoquinoline‐1,3,8,10(2H,9H)‐tetrone (PDINO) as the ETL. The ETL‐free cells deliver a superior shelf life compared to devices with an ETL. Small‐molecule donor–acceptor blends thus provide interesting perspectives for achieving efficient, reproducible, and stable device architectures without electrode interlayers.

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Section: Introductionmentioning

confidence: 99%

Efficient Electron Transport Layer Free Small‐Molecule Organic Solar Cells with Superior Device Stability

Bin

Wang

et al. 2021

Advanced Materials

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“…[ 16–22 ] These advances can be largely attributed to the emergence of high‐performance non‐fullerene acceptors (NFAs). [ 23–33 ] Since NFAs have excellent tunability of optical and electrochemical properties, it is feasible to tailor the structures and match with various donor polymers. By proper choices and matching of donor and acceptor materials, optimal bulk‐heterojunction (BHJ) morphology can be achieved, thus leading to excellent photovoltaic performance.…”

Section: Introductionmentioning

confidence: 99%

Achieving Efficient Ternary Organic Solar Cells Using Structurally Similar Non‐Fullerene Acceptors with Varying Flanking Side Chains

Chang

Zhang

Chen

et al. 2021

Advanced Energy Materials

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In this work, the properties and performance of three structurally similar non‐fullerene acceptors (named BTP‐Ph, BTP‐Th, and BTP‐C11) possessing different side chains on the β‐positions of the thienothiophene units of the Y6 molecule are systematically studied. The steric and electronic effects of these side chains on the blend morphology and device performance based on the PTQ10 donor polymer are investigated. It is found that the thiophene and benzene units on the side chains introduce more steric hindrance and thus slightly reduce the crystallinity of the molecule. However, an interesting matching trend with the PTQ10 donor that appears to better match with the less crystalline molecules is observed. Overall, PTQ10:BTP‐Ph delivers the highest performance of 17.1% due to the suitable phase separation among three blends. Next, a ternary strategy is explored by incorporating BTP‐Th/BTP‐C11 with better molecular packing into PTQ10:BTP‐Ph, which successfully extends photon response, enhances charge transport, and suppresses charge recombination compared with the binary blend. Due to these synergistic effects, the ternary device based on PTQ10:BTP‐Ph:BTP‐Th achieves an outstanding power conversion efficiency of 17.6% with a fill factor of 78.8%, which is the highest value of PTQ10‐based devices to date.

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“…So far, the PCE of ≈16–17% was achieved with the BDT‐based copolymer: Y6 in the binary system. [ 18–23 ]…”

Section: Introductionmentioning

confidence: 99%

Over 14% Efficiency Single‐Junction Organic Solar Cells Enabled by Reasonable Conformation Modulating in Naphtho[2,3‐b:6,7‐b′]difuran Based Polymer

Zheng

Feng

Zhang

et al. 2021

Advanced Energy Materials

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As one kind of abundant product from renewable resources, furan and its fused‐ring derivatives, have provoked great interest in the context of developing efficient photovoltaic materials. However, the power conversion efficiency (PCE) of furan‐based photovoltaic materials has lagged behind its thiophene counterparts. In this work, in consideration of the ordered π–π stacking via extending conjugation to further improve the charge mobility, a novel furan fused‐ring derivative of naphtho[2,3‐b:6,7‐b′]difuran (NDF) based copolymer of NDF‐3T is designed and synthesized. Because of its favorable linear molecular conformation, the NDF‐3T possesses a high crystallinity, as well as ordered and dense π–π stacking. Subsequently, the NDF‐3T‐based device exhibits an efficient PCE of 14.21%, which is higher than that of the analogue naphthodithiophene (NDT) counterpart (10.86%). To the best of the authors’ knowledge, the PCE is also the best record in furan‐based photovoltaic materials. More importantly, the development of line NDF shows great potential in construing highly efficient photovoltaic materials and can be referenced to other furan fused‐ring structures.

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Random terpolymer based on thiophene-thiazolothiazole unit enabling efficient non-fullerene organic solar cells

Cited by 241 publications

References 56 publications

Efficient Electron Transport Layer Free Small‐Molecule Organic Solar Cells with Superior Device Stability

Efficient Electron Transport Layer Free Small‐Molecule Organic Solar Cells with Superior Device Stability

Achieving Efficient Ternary Organic Solar Cells Using Structurally Similar Non‐Fullerene Acceptors with Varying Flanking Side Chains

Over 14% Efficiency Single‐Junction Organic Solar Cells Enabled by Reasonable Conformation Modulating in Naphtho[2,3‐b:6,7‐b′]difuran Based Polymer

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