Realizing 19.05% Efficiency Polymer Solar Cells by Progressively Improving Charge Extraction and Suppressing Charge Recombination

Advanced Materials, Год журнала: 2022, Номер 34(13)

Опубликована: Янв. 26, 2022

Improving charge extraction and suppressing recombination are critically important to minimize the loss of absorbed photons improve device performance polymer solar cells (PSCs). In this work, highly efficient PSCs demonstrated by progressively improving through combination side-chain engineering new nonfullerene acceptors (NFAs), adopting ternary blends, introducing volatilizable solid additives. The 2D side chains on BTP-Th induce a certain steric hindrance for molecular packing phase separation, which is mitigated fluorination BTP-FTh. Moreover, two crystalline molecules as second acceptor additive, respectively, into BTP-FTh-based host blend, crystallinity significantly improved blend morphology finely optimized. As expected, enhanced suppressed realized, contributing largely fill factor (FF) resultant devices. Accompanied open-circuit voltage (Voc ) short-circuit current density (Jsc ), record high power conversion efficiency (PCE) 19.05% realized finally.

Язык: Английский

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Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor

Advanced Materials, Год журнала: 2022, Номер 34(32)

Опубликована: Июнь 20, 2022

A record power conversion efficiency (PCE) of over 19% is realized in planar-mixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy making a pseudosymmetric electron acceptor, BS3TSe-4F. The combined molecular asymmetry with more polarizable increases dielectric constant D18/BS3TSe-4F blend, helping lower exciton binding energy. On other hand, dimer packing BS3TSe-4F facilitated to enable free charge generation, efficient dissociation and lowering radiative recombination loss (ΔE2 ) OSCs. As result, PMHJ OSCs based on achieve PCE 18.48%. By incorporating another mid-bandgap acceptor Y6-O into form ternary PMHJ, higher open-circuit voltage (VOC can be achieved realize an impressive 19.03%. findings using acceptors enhancing device provides effective way develop highly materials for

Язык: Английский

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Fibrillization of Non‐Fullerene Acceptors Enables 19% Efficiency Pseudo‐Bulk Heterojunction Organic Solar Cells

Advanced Materials, Год журнала: 2022, Номер 35(6)

Опубликована: Ноя. 24, 2022

The structural order and aggregation of non-fullerene acceptors (NFA) are critical toward light absorption, phase separation, charge transport properties their photovoltaic blends with electron donors, determine the power conversion efficiency (PCE) corresponding organic solar cells (OSCs). In this work, fibrillization small molecular NFA L8-BO assistance fused-ring solvent additive 1-fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dynamics simulations show that FN attaches backbone as bridge enhance intermolecular packing , inducing 1D self-assembly into fine fibrils a compact polycrystal structure. incorporated pseudo-bulk heterojunction (P-BHJ) active layer D18 donor, enhanced transport, collection properties, leading from 16.0% an unprecedented 19.0% in D18/L8-BO binary P-BHJ OSC, featuring high fill factor 80%. This work demonstrates strategy for fibrillating NFAs performance OSCs.

Язык: Английский

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Recent Progress of Y6‐Derived Asymmetric Fused Ring Electron Acceptors

Advanced Functional Materials, Год журнала: 2022, Номер 32(35)

Опубликована: Июль 5, 2022

Abstract Symmetric conjugated molecules can be broken through suitable synthetic strategies to construct novel asymmetric molecules, which largely broaden the material library. In field of organic solar cells, fused‐ring electron acceptors (FREAs) with A‐DA'D‐A type backbone structure have attracted much attention and enabled power conversion efficiencies (PCE) exceeding 18%. Among them, Y6 is one most classic FREAs that derive many symmetric exhibit unique optoelectronic properties. Thus, in this review, focus on recent progress Y6‐derived containing a dipyrrolobenzothiadiazole segment, classified as following three categories: end group, central core side chain. The relationship molecular structure, properties, device performance discussed detail. Finally, future design directions challenges faced by kind photovoltaic materials are given.

Язык: Английский

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Lowing the energy loss of organic solar cells by molecular packing engineering via multiple molecular conjugation extension

Science China Chemistry, Год журнала: 2022, Номер 65(7), С. 1362 - 1373

Опубликована: Май 6, 2022

Язык: Английский

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Mastering morphology of non-fullerene acceptors towards long-term stable organic solar cells

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 10, 2023

Despite the rapid progress of organic solar cells based on non-fullerene acceptors, simultaneously achieving high power conversion efficiency and long-term stability for commercialization requires sustainable research effort. Here, we demonstrate stable devices by integrating a wide bandgap electron-donating polymer (namely PTzBI-dF) two acceptors L8BO Y6) that feature similar structures yet different thermal morphological properties. The cell PTzBI-dF:L8BO:Y6 could achieve promising 18.26% in conventional device structure. In inverted structure, excellent over 1400 h under 85 °C continuous heating is obtained. improved performance can be ascribed to suppressed charge recombination along with appropriate transport. We find features terms crystalline coherence length fresh aged films gradually regulated weight ratio L8BO:Y6. Additionally, occurrence melting point decrease reduced enthalpy prohibit amorphous phase cluster, consequently overcome energetic traps accumulation aroused stress, which critical issue acceptors-based devices. This work provides insight into understanding stability.

Язык: Английский

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Revealing the underlying solvent effect on film morphology in high-efficiency organic solar cells through combinedex situandin situobservations

Energy & Environmental Science, Год журнала: 2023, Номер 16(5), С. 2316 - 2326

Опубликована: Янв. 1, 2023

Here the aggregation behavior differences induced by solvent–material and material–material interactions are clearly revealed combined ex situ in morphology characterization studies on representative high-efficiency OPV systems.

Язык: Английский

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Giant Molecule Acceptor Enables Highly Efficient Organic Solar Cells Processed Using Non‐halogenated Solvent

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(26)

Опубликована: Апрель 26, 2023

High efficiency organic solar cells (OSCs) based on A-DA'D-A type small molecule acceptors (SMAs) were mostly fabricated by toxic halogenated solvent processing, and power conversion (PCE) of the non-halogenated processed OSCs is mainly restricted excessive aggregation SMAs. To address this issue, we developed two vinyl π-spacer linking-site isomerized giant (GMAs) with linking inner carbon (EV-i) or out (EV-o) benzene end group SMA longer alkyl side chains (ECOD) for capability solvent-processing. Interestingly, EV-i possesses a twisted molecular structure but enhanced conjugation, while EV-o shows better planar weakened conjugation. The OSC as acceptor o-xylene (o-XY) demonstrated higher PCE 18.27 % than that devices ECOD (16.40 %) (2.50 %). one highest PCEs among from solvents so far, benefitted suitable structure, stronger absorbance high charge carrier mobility EV-i. results indicate GMAs site would be excellent candidates fabricating performance solvents.

Язык: Английский

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Importance of structural hinderance in performance–stability equilibrium of organic photovoltaics

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Окт. 8, 2022

Power conversion efficiency and long-term stability are two critical metrics for evaluating the commercial potential of organic photovoltaics. Although field has witnessed a rapid progress towards 19%, intrinsic trade-off between is still challenging issue bulk-heterojunction cells due to very delicate crystallization dynamics species. Herein, we developed class non-fullerene acceptors with varied side groups as an alternative aliphatic chains. Among them, conjugated show larger side-group torsion more twisted backbone, however, they can deliver high 18.3% in xylene-processed cells, which among highest values reported non-halogenated solvent processed cells. Meanwhile, decent thermal/photo realized these containing groups. Through investigation geometry-performance-stability relationship, highlight importance steric hinderance achieving combined high-performance, stable, eco-friendly

Язык: Английский

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Reducing Photovoltaic Property Loss of Organic Solar Cells in Blade‐Coating by Optimizing Micro‐Nanomorphology via Nonhalogenated Solvent

Advanced Energy Materials, Год журнала: 2022, Номер 12(14)

Опубликована: Март 7, 2022

Abstract Blade‐coating which is compatible with roll‐to‐roll (R2R) fabrication has been considered a promising technology for the large‐scale production of organic solar cells (OSCs). Despite rapid increase in power conversion efficiency (PCE) devices, most processing solvents are still halogenated, key issue that needs to be addressed urgently commercialized manufacturing. In this work, targeted strategies explored preparation efficient OSCs via combining nonhalogenated solvent toluene (TL) blade‐coating. Based on situ UV–vis absorption, grazing‐incidence wide‐angle X‐ray scattering, and device performance measurements, subtle relationship between solvents, film morphology, properties successfully established. The PM6:BTP‐eC9 blend prepared by strategy demonstrates higher crystallinity smaller phase separation resulting an outstanding PCE 16.58% low energy loss high fill factor, than CF‐based (15.08%). Finally, 1.00 cm 2 exhibits 14.82%, one highest values blade‐coating based TL solvent. This specific combines shows synergy optimization demonstrating excellent potential highly large area OSCs.

Язык: Английский

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