Rational molecular and device design enables organic solar cells approaching 20% efficiency

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Feb. 28, 2024

Abstract For organic solar cells to be competitive, the light-absorbing molecules should simultaneously satisfy multiple key requirements, including weak-absorption charge transfer state, high dielectric constant, suitable surface energy, proper crystallinity, etc. However, systematic design rule in achieve abovementioned goals is rarely studied. In this work, guided by theoretical calculation, we present a rational of non-fullerene acceptor o-BTP-eC9, with distinct photoelectric properties compared benchmark BTP-eC9. o-BTP-eC9 based device has uplifted therefore significantly reducing energy loss 41 meV and showing excellent power conversion efficiency 18.7%. Moreover, new guest miscibility, level compatibility BTP-eC9, which enables an 19.9% (19.5% certified) PM6:BTP-C9:o-BTP-eC9 ternary system enhanced operational stability.

Language: Английский

---

Donor–acceptor mutually diluted heterojunctions for layer-by-layer fabrication of high-performance organic solar cells

Nature Energy, Journal Year: 2024, Volume and Issue: 9(2), P. 208 - 218

Published: Jan. 9, 2024

Language: Английский

---

Molecular interaction induced dual fibrils towards organic solar cells with certified efficiency over 20%

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 10, 2024

The nanoscale fibrillar morphology, featuring long-range structural order, provides abundant interfaces for efficient exciton dissociation and high-quality pathways effective charge transport, is a promising morphology high performance organic solar cells. Here, we synthesize thiophene terminated non-fullerene acceptor, L8-ThCl, to induce the fibrillization of both polymer donor host that surpasses 20% efficiency milestone After adding original weak less continuous nanofibrils donors, i.e. PM6 or D18, are well enlarged refined, whilst acceptor L8-BO also assembles into with enhanced order. By adapting layer-by-layer deposition method, order can be retained significantly boost power conversion efficiency, specific values 19.4% 20.1% PM6:L8-ThCl/L8-BO:L8-ThCl D18:L8-ThCl/L8-BO:L8-ThCl devices, latter being certified 20.0%, which highest reported so far single-junction

Language: Английский

---

High‐Performance Organic Solar Cells Containing Pyrido[2,3‐b]quinoxaline‐Core‐Based Small‐Molecule Acceptors with Optimized Orbit Overlap Lengths and Molecular Packing

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: May 26, 2023

Abstract The central core in A‐DA 1 D‐A‐type small‐molecule acceptor (SMAs) plays an important role determining the efficiency of organic solar cells (OSCs), while principles governing efficient design SMAs remain elusive. Herein, we developed a series with pyrido[2,3‐ b ]quinoxaline (PyQx) as new electron‐deficient unit by combining cascade‐chlorination strategy, namely Py1, Py2, Py3, Py4 and Py5. introduction chlorine atoms reduces intramolecular charge transfer effects but elevates LUMO values. Density functional theory (DFT) reveals that Py2 ortho substituted PyQx Py5 two yield larger dipole moments smaller π⋅⋅⋅π stacking distances, compared other three acceptors. Moreover, shows strongest light absorption capability induced extended orbit overlap lengths more packing structures dimers. These features endow best device performance due to better molecular aggregation behaviors, suitable domain sizes exciton dissociation recombination. This study highlights significance incorporating large moments, small distances dimers into development high‐performance SMAs, providing insight for OSCs.

Language: Английский

---

Achieving 19.4% organic solar cell via an in situ formation of p-i-n structure with built-in interpenetrating network

Joule, Journal Year: 2024, Volume and Issue: 8(2), P. 509 - 526

Published: Jan. 11, 2024

Language: Английский

---

Electronic Configuration Tuning of Centrally Extended Non‐Fullerene Acceptors Enabling Organic Solar Cells with Efficiency Approaching 19 %

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(42)

Published: Aug. 26, 2023

In the molecular optimizations of non-fullerene acceptors (NFAs), extending central core can tune energy levels, reduce nonradiative loss, enhance intramolecular (donor-acceptor and acceptor-acceptor) packing, facilitate charge transport, improve device performance. this study, a new strategy was employed to synthesize featuring conjugation-extended electron-deficient cores. Among these, acceptor CH-BBQ, embedded with benzobisthiadiazole, exhibited an optimal fibrillar network morphology, enhanced crystallinity, improved generation/transport in blend films, leading power conversion efficiency 18.94 % for CH-BBQ-based ternary organic solar cells (OSCs; 18.19 binary OSCs) owing its delicate structure design electronic configuration tuning. Both experimental theoretical approaches were used systematically investigate influence on properties The modulation paves pathway engineering NFAs, propelling relevant research forward.

Language: Английский

---

Hot‐Casting Strategy Empowers High‐Boiling Solvent‐Processed Organic Solar Cells with Over 18.5% Efficiency

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(3)

Published: Aug. 9, 2023

Abstract Most top‐rank organic solar cells (OSCs) are manufactured by the halogenated solvent chloroform, which possesses a narrow processing window due to its low‐boiling point. Herein, based on two high‐boiling solvents, chlorobenzene (CB) and non‐halogenated green ortho‐xylene (OX), preparing active layers with hot solution is put forward enhance performance of OSCs. In situ test morphological characterization clarify that hot‐casting strategy assists in fast synchronous molecular assembly both donor acceptor layer, contributing preferable donor/acceptor ratio, vertical phase separation, stacking, beneficial charge generation extraction. Based PM6:BO‐4Cl, OSCs wide achieve efficiencies 18.03% CB 18.12% OX, much higher than devices processed room temperature solution. Moreover, PM6:BTP‐eC9 deliver remarkable fill factor 80.31% efficiency 18.52% representing record value among binary solvent. This work demonstrates facile manipulate distribution arrangement for boosting solvents.

Language: Английский

---

Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(15)

Published: July 7, 2023

Abstract Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how acceptor(s) would tune aggregation of donors, and furthermore film morphology device performance (efficiency stability). Herein, it reported that matching celebrity acceptor PY‐IT donor PBQx‐TCl results enhanced H ‐ PBQx‐TCl, which can be finely tuned by controlling amount second PY‐IV. Consequently, efficiency‐optimized PY‐IV weight ratio (0.2/1.2) leads to state‐of‐the‐art power conversion efficiency 18.81%, wherein light‐illuminated operational stability also along with well‐protected thermal stability. Such enhancements stabilities attributed optimization desired glass transition temperature target active layer based comprehensive characterization. In addition being high‐power case for cells, these are successful attempt using combined toward optimal morphology, provides theoretical basis construction other types organic photovoltaics beyond cells.

Language: Английский

---

A Polycrystalline Polymer Donor as Pre‐Aggregate toward Ordered Molecular Aggregation for 19.3% Efficiency Binary Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(41)

Published: July 20, 2023

Organic semiconductors are generally featured with low structure order in solid-state films, which leads to charge-transport mobility and strong charge recombination their photovoltaic devices. In this work, a "polycrystal-induced aggregation" strategy orders the polymer donor (PM6) non-fullerene acceptor (L8-BO) molecules during solution casting assistance of PM6 polycrystals that incubated through vapor diffusion method, toward improved solar cell efficiency either thin or thick photoactive layers. These redissolved chloroform prepare pre-aggregates (PM6-PA), further incorporated into conventional PM6:L8-BO blend solutions, is found prolong molecular organization process enhance aggregation both L8-BO components. As results, 10% PM6-PA, devices obtain power conversion efficiencies (PCEs) from 18.0% 16.2% 19.3% 17.2% 100 nm-thick 300 layer, respectively.

Language: Английский

---

Green-Solvent Processed Blade-Coating Organic Solar Cells with an Efficiency Approaching 19% Enabled by Alkyl-Tailored Acceptors

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Nov. 2, 2023

Abstract Power-conversion-efficiencies (PCEs) of organic solar cells (OSCs) in laboratory, normally processed by spin-coating technology with toxic halogenated solvents, have reached over 19%. However, there is usually a marked PCE drop when the blade-coating and/or green-solvents toward large-scale printing are used instead, which hampers practical development OSCs. Here, new series N -alkyl-tailored small molecule acceptors named YR-SeNF same molecular main backbone developed combining selenium-fused central-core and naphthalene-fused end-group. Thanks to -alkyl engineering, NIR-absorbing show different crystallinity, packing patterns, miscibility polymeric donor. The studies exhibit that packing, vertical distribution active layer morphologies well optimized introducing newly designed guest acceptor associated tailored chains, providing improved charge transfer dynamics stability for PM6:L8-BO:YR-SeNF-based As result, record-high approaching 19% achieved OSCs fabricated from green-solvent o -xylene high-boiling point. Notably, ternary offer robust operating under maximum-power-point tracking well-keep > 80% initial PCEs even 400 h. Our alkyl-tailored strategy provides unique approach develop high-efficiency stable OSCs, paves way industrial development.

Language: Английский

---