Naphthalene diimide-based cathode interlayer material enables 20.2% efficiency in organic photovoltaic cells

Science China Chemistry, Год журнала: 2024, Номер 67(12), С. 4194 - 4201

Опубликована: Авг. 30, 2024

Язык: Английский

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Controlled Dedoping and Redoping of N‐Doped Poly(benzodifurandione) (n‐PBDF)

Advanced Functional Materials, Год журнала: 2024, Номер 34(33)

Опубликована: Апрель 15, 2024

Abstract The doping levels of conjugated polymers significantly influence their conductivity, energetics, and optical properties. Recently, a highly conductive n‐doped polymer called poly (3,7‐dihydrobenzo[1,2‐b:4,5‐b′]difuran‐2,6‐dione) (poly(benzodifurandione), n‐PBDF) is discovered, opening new possibilities for n‐type conducting in printed electronics other fields. Controlling the level n‐PBDF great interest due to its wide range potential applications. Here controlled dedoping redoping reported mechanistic understating such process provided. Dedoping occurs through electron transfer proton capture, wherein ionic dopants, tris(4‐bromophenyl)ammoniumyl hexachloroantimonate (Magic Blue), exhibit efficient capture ability stronger interaction with n‐PBDF, resulting high efficiency. Moreover, chemically dedoped PBDF can be redoped using various proton‐coupled agents. By manipulating thin films, ranging from doped states, system demonstrates controllable conductivity five orders magnitude, adjustable properties, energetics. As result, these characteristics demonstrate applications organic electrochemical transistors thermoelectrics.

Язык: Английский

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Alcohol‐Soluble n‐Type Polythiophenes as Cathode Interlayer in Organic Photodetectors for Hole Blocking

Advanced Functional Materials, Год журнала: 2024, Номер 34(24)

Опубликована: Фев. 7, 2024

Abstract For organic photodetectors (OPDs), cathode interlayer (CIL) with low‐lying highest occupied molecular orbital ( E HOMO ) energy level is required to reduce dark current density J d ). In this study, toward application as CIL in OPDs, an alcohol‐processable n‐type conjugated polymer (n‐PT8) based on imide/cyano‐substituted polythiophene backbone and branched oligo(ethylene glycol) side chain developed. Owing the electron‐accepting imide/cyano groups backbone, n‐PT8 exhibits deep‐lying of −5.80 eV a high conductivity 5.12 × 10 −6 S cm −1 . OPD one order magnitude lower than that state‐of‐the‐art material because large barrier for reverse hole injection. Moreover, device performance insensitive layer thickness, which very desirable mass production OPDs. The near‐infrared (NIR) OPDs exhibit ultra‐low 1.76 −9 A −2 specific detectivity 2.88 12 Hz 1/2 W at V. To best knowledge, first report derivatives opto‐electronic devices.

Язык: Английский

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Binary Organic Solar Cells with >19.6% Efficiency: The Significance of Self-Assembled Monolayer Modification

ACS Energy Letters, Год журнала: 2024, Номер 9(9), С. 4209 - 4217

Опубликована: Авг. 1, 2024

Improving the uniformity and density of self-assembled monolayers (SAMs) is crucial to elevate photovoltaic performance organic solar cells (OSCs). Herein, we introduced small molecules 1-hydroxybenzotriazole (HOBT) modulate distribution electrical properties (4-(7H-dibenzo[c,g]carbazol-7-yl)butyl)phosphonic acid (4PADCB) on indium tin oxide (ITO) transparent electrodes in an innovative manner. The hydroxyl group HOBT interacts with phosphate SAMs, while steric repulsion exerted by backbone efficiently regulates SAMs. This led a more uniform dense SAMs ITO. Furthermore, HOBT-modified have improved crystallization vertical phase separation upper active layer. Consequently, PM6:BTP-eC9 binary OSCs based exhibit impressive PCE 19.66%. Our work presents effective strategy for regulating SAM morphology offers promising approach advancing OSCs.

Язык: Английский

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Theoretical investigation of substituted end groups in thiophene‐phenyl‐thiophene (TPT) derivatives for high efficiency organic solar cells

Journal of Physical Organic Chemistry, Год журнала: 2024, Номер 37(6)

Опубликована: Март 14, 2024

Abstract The field of organic solar cells has witnessed notable advancements in the past few years, mostly due to development novel materials for active layer. current investigations reveal potential nine previously unexplored molecules ( TP1–TP9 ) designed by end group modification TPT4F molecule. These were investigated at MPW1PW91/6‐31G (d, p) with DFT and TD‐DFT approach study various photovoltaic geometrical parameters. results obtained through computations indicated improvement terminal shifted absorption maximum towards longer wavelength UV‐visible region. Highly conjugated modified acceptors reduced band gap. lower excitation energies increased rate charge transfer. showed improved excited state lifetime comparison reference. open circuit voltage was determined using PTB7 polymer, which exhibited a noticeable improvement, especially TP1 (1.70 eV), TP3 (1.75 TP4 (1.68 TP6 (1.85 TP7 eV) when compared reference (1.59 eV). Moreover, transfer complex performed analyzing concentration over molecular orbitals, that is, HOMO LUMO. All preceding targeted achieve high‐efficiency altered can be considered effective candidates tackle future energy problems.

Язык: Английский

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Realizing over 18% Efficiency for M‐Series Acceptor‐Based Polymer Solar Cells by Improving Light Utilization

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Июль 2, 2024

Abstract M‐series molecules are one kind of promising acceptor‐donor‐acceptor (A‐D‐A)‐type acceptors for constructing high‐performance organic solar cells (OSCs). However, their power conversion efficiencies (PCEs) lagging behind that current state‐of‐the‐art OSCs, limited by the relatively low fill factor (FF) and photocurrent. Herein, combined strategies layer‐by‐layer (LBL) deposition interface engineering conducted to systematically improve light utilization thus PCEs M36‐based OSCs. Through choosing a proper processing solvent, PCE 17.3% with an FF 77.9% is achieved resulting LBL devices, much higher than those (15.9%/74.0%) from blend‐casting devices. The improvement assigned favorable morphological evolution facilitates carrier generation transport as well reduces charge recombination. More importantly, light‐harvesting active layers can be enhanced upon employing self‐assembled monolayer (2‐(9H‐carbazol‐9‐yl)ethyl)phosphonic acid (2PACz) instead widely used PEDOT:PSS hole‐selecting layer, due decreased parasitic absorption former. Consequently, 2PACz‐based devices exhibit significantly increased photocurrent, affording up 18.2%, which highest among reported A‐D‐A‐type acceptor‐based These results deliver important enhance performance OSCs highlight great potential practical applications.

Язык: Английский

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Versatile Self‐Assembled Monolayer Material Enables Efficient Organic Photovoltaic Devices and Modules

Advanced Energy Materials, Год журнала: 2024, Номер 14(19)

Опубликована: Апрель 9, 2024

Abstract Efficient and stable hole transport layer (HTL) is an important component of organic photovoltaics (OPV). Herein, a novel self‐assembled monolayer material 4PADCB (short for (4‐(7H‐dibenzo[c,g]carbazol‐7‐yl)butyl)phosphonic acid) as HTL non‐fullerene (NF) OPV reported. Compared to the widely used PEDOT:PSS HTL, usage not only enhances photon incident charge generation but also effectively improves morphology upper active layer, promotes molecular packing, balances carrier within layer. As result, single‐junction binary D18:L8BO OPV, employing achieves high‐power conversion efficiency (PCE) 19.02% with excellent storage stability. Furthermore, 19.3 cm 2 module comprising seven sub‐cells demonstrates maximum PCE 15.44%, which highest value reported large‐area modules. Meanwhile, first demonstration based on material. This work underscores substantial potential application in efficient NF devices high‐throughput

Язык: Английский

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Hole-selective-molecule doping improves the layer thickness tolerance of PEDOT:PSS for efficient organic solar cells

eScience, Год журнала: 2024, Номер unknown, С. 100305 - 100305

Опубликована: Авг. 1, 2024

When used in organic solar cells, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) aligns interfacial energy levels, promotes hole extraction, blocks electrons, and optimizes the active layer's morphology. However, with an optimal thickness of approximately 30–40 nm, PEDOT:PSS has insufficient layer tolerance, owing to its low conductivity extraction property. Herein, a hole-selective-molecule doping strategy is proposed enhance properties by introducing MPA2FPh-BT-BA (abbreviated as 2F) into layer. 2F assembles at anode form dipoles due unique donor–acceptor–anchor molecular configuration, altering work function hole-selective extraction. Additionally, improves aggregation forming hydrogen bonds PSS group, enhancing characteristics. These changes further influence overlaying morphology, leading increased crystalline features PM6 bulk heterojunction PM6:Y6. 2F-PEDOT:PSS (2FPP) used, power conversion efficiencies 18.3%, 19.2%, 19.1% are achieved PM6:Y6, PM6:BTP-eC9, PM6:L8-BO devices, respectively, outperforming counterparts PEDOT:PSS. Specifically, performance PM6:Y6 devices 2FPP 170 nm remains >15%, providing valuable guidance for designing thickness-insensitive transport high-efficiency cells.

Язык: Английский

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Multifunctional ternary semitransparent organic solar cell module with area above 100 cm² and average visible transmittance above 30%

Energy & Environmental Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

We present a method for fabricating high-performance ST-OSC modules incorporating the high mobility small molecule donor BTR-Cl into active layer at low content, demonstrating potential of in field energy conservation and environmental protection.

Язык: Английский

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A Review of Material Design for High Performance Triboelectric Nanogenerators: Performance Improvement Based on Charge Generation and Charge Loss

Nanoscale Advances, Год журнала: 2024, Номер 6(18), С. 4522 - 4544

Опубликована: Янв. 1, 2024

This review summarizes the relevant material-design strategies for improving output performance of TENGs based on charge generation and loss.

Язык: Английский

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