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

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(13)

Published: Jan. 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.

Language: Английский

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

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(32)

Published: June 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

Language: Английский

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Recent progress in organic solar cells (Part II device engineering)

Science China Chemistry, Journal Year: 2022, Volume and Issue: 65(8), P. 1457 - 1497

Published: May 26, 2022

Language: Английский

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19.10% Efficiency and 80.5% Fill Factor Layer‐by‐Layer Organic Solar Cells Realized by 4‐Bis(2‐Thienyl)Pyrrole‐2,5‐Dione Based Polymer Additives for Inducing Vertical Segregation Morphology

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: Nov. 22, 2022

The morphology plays a key role in determining the charge generation and collection process, thus impacting performances of organic solar cells (OSCs). limited selection pool additives to optimize OSCs, especially for emerging layer-by-layer (LbL) impeding improvements photovoltaic performances. Herein, new method using conjugated polymers as improving LbL-OSCs is reported. Four PH, PS, PF, PCl are developed with different side chains. These exhibit poor donor materials BHJ devices, due unsuitable energy level alignment unfavorable molecular interactions. By contrast, they can be served efficient PM6 fibril matrix facilitating penetration BTP-eC9 forming an intertwined D/A bicontinuous network vertical segregation. Such optimized by chain engineering, which enables progressive improvement separation collection. As result, adding small amount additive, contributes champion PCE 19.10% high FF 80.5%.

Language: Английский

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Process‐Aid Solid Engineering Triggers Delicately Modulation of Y‐Series Non‐Fullerene Acceptor for Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(20)

Published: March 22, 2022

Volatile solids with symmetric π-backbone are intensively implemented on manipulating the nanomorphology for improving operability and stability of organic solar cells. However, due to isotropic stacking, announced geometry cannot modify microscopic phase separation component distribution collaboratively, which will constrain promotion exciton splitting charge collection efficiency. Inspired by superiorities asymmetric configuration, a novel process-aid solid (PAS) engineering is proposed. By coupling BTP core unit in Y-series molecule, an asymmetric, volatile 1,3-dibromo-5-chlorobenzene can induce anisotropic dipole direction, elevated moment, interlaminar interaction spontaneously. Due synergetic effects favorable desired distribution, PAS-treated devices feature evident improvement splitting, transport, collection, accompanied suppressed trap-assisted recombination. Consequently, impressive fill factor 80.2% maximum power conversion efficiency (PCE) 18.5% device achieved. More strikingly, demonstrate promising thickness-tolerance character, where record PCE 17.0% yielded PAS 300 nm thickness photoactive layer, represents highest thick-film

Language: Английский

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Over 19.2% Efficiency of Organic Solar Cells Enabled by Precisely Tuning the Charge Transfer State Via Donor Alloy Strategy

Advanced Science, Journal Year: 2022, Volume and Issue: 9(30)

Published: Aug. 23, 2022

The large energy loss (Eloss ) is one of the main obstacles to further improve photovoltaic performance organic solar cells (OSCs), which closely related charge transfer (CT) state. Herein, ternary donor alloy strategy used precisely tune CT state (ECT and thus Eloss for boosting efficiency OSCs. elevated ECT in OSCs reduce generation (ΔECT ), promote hybridization between localized excitation nonradiative (ΔEnonrad ). Together with optimal morphology, afford an impressive power conversion 19.22% a significantly improved open-circuit voltage (Voc 0.910 V without sacrificing short-cicuit density (Jsc fill factor (FF) comparison binary ones. This contribution reveals that tuning via efficient way minimize

Language: Английский

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Sequential Deposition of Multicomponent Bulk Heterojunctions Increases Efficiency of Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(12)

Published: Jan. 18, 2023

Constructing tandem and multi-blend organic solar cells (OSCs) is an effective way to overcome the absorption limitations of conventional single-junction devices. However, these methods inevitably require tedious multilayer deposition or complicated morphology-optimization procedures. Herein, sequential utilized as simple method fabricate multicomponent OSCs with a double-bulk heterojunction (BHJ) structure active layer further improve photovoltaic performance. Two efficient donor-acceptor pairs, D18-Cl:BTP-eC9 PM6:L8-BO, are sequentially deposited form D18-Cl:BTP-eC9/PM6:L8-BO double-BHJ layer. In OSCs, light significantly improved, optimal morphology also retained without requiring more optimization involved in quaternary blends. Compared blend devices, energy loss (Eloss ) reduced by rationally matching each donor appropriate acceptor. Consequently, power conversion efficiency (PCE) improved from 18.25% for 18.69% PM6:L8-BO based binary 19.61% OSCs. contrast, D18-Cl:PM6:L8-BO:BTP-eC9 exhibited dramatically PCE 15.83%. These results demonstrate that strategy, relatively processing procedure, can potentially enhance device performance lead widespread use.

Language: Английский

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Isogenous Asymmetric–Symmetric Acceptors Enable Efficient Ternary Organic Solar Cells with Thin and 300 nm Thick Active Layers Simultaneously

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(26)

Published: March 23, 2022

Abstract Integrating desirable light absorption, energy levels, and morphology in one matrix is always the aspiration to construct high‐performance organic solar cells (OSCs). Herein, an asymmetric acceptor Y6‐1O incorporated into binary blends of Y7‐BO donor PM6 prepare ternary OSCs. Two isogenous asymmetric–symmetric acceptors with similar chemical skeletons tend form alloy‐like state due their good compatibility, which contributes optimizing for efficient charge generation extraction. The complementary absorption two helps improve photon harvesting blends, higher lowest unoccupied molecular orbital (LUMO) level offers chance uplift mixed LUMO levels acceptors. Combining aforesaid benefits, OSCs 10 wt% produce a top‐ranked power conversion efficiency (PCE) 18.11% simultaneously elevated short‐circuit current density, open‐circuit voltage, fill factor comparison Y7‐BO‐based devices. Furthermore, optimized ≈300 nm active layers obtain champion PCE 16.61%, highest value thick‐film devices reported so far. This work puts forward avenue further boosting performance but different structures.

Language: Английский

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Ultraviolet Narrowband Photomultiplication Type Organic Photodetectors with Fabry−Pérot Resonator Architecture

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(29)

Published: April 28, 2022

Abstract Ultraviolet (UV) narrowband photodetectors play a critical role in missile detection, flame monitoring, optical communication, etc. It is great challenge to realize UV organic due wide photo‐harvesting property of materials, especially for photomultiplication type (PM‐OPDs). In this work, smart strategy proposed achieve response by coupling Fabry−Pérot microcavity with PM‐OPDs. PM‐OPDs are realized using poly(3‐hexylthiophene‐2,5‐diyl):[6,6]‐phenyl‐C 71 ‐butyric acid methyl ester (100:1, w/w) as active layers, exhibiting broadband range covering from UV–vis region. Series microcavities consisting Ag/LiF/Ag spectral selectivity prepared, which employed couple the achieving response. The can be optimized tuning thickness spacer layer and mirror further regulate photogenerated electron distribution near Al electrode optimize external quantum efficiency (EQE) spectra coupled microcavity. exhibit EQE 9300% at 350 nm 33 full‐width half‐maximum under −15 V bias. This work indicates that should an efficient

Language: Английский

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Controlling Morphology and Voltage Loss with Ternary Strategy Triggers Efficient All-Small-Molecule Organic Solar Cells

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 1058 - 1067

Published: Jan. 23, 2023

Herein, an emerging acceptor L8-BO as the third component was combined with B1:BO-4Cl system for constructing efficient ternary all-small-molecule organic solar cells (ASM-OSCs). Theoretical, morphological, and crystallographic studies reveal that BO-4Cl possess good compatibility, resulting in alloy-like state formation of two acceptors blends. The synergistic effect is conducive to forming favorable phase separation molecular stacking promoting charge splitting extraction, which contributes simultaneously boosting short-circuit current density fill factor. Furthermore, higher lowest unoccupied orbital energy level assist ASM-OSCs achieving lower voltage loss respect binary devices. optimal 20 wt % deliver a top-level efficiency 17.10%. This work demonstrates not only morphology but also small matrix can be well-manipulated by employing strategy.

Language: Английский

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