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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A time and resource efficient machine learning assisted design of non-fullerene small molecule acceptors for P3HT-based organic solar cells and green solvent selection

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(28), P. 15684 - 15695

Published: Jan. 1, 2021

A time and money efficient machine learning assisted design of non-fullerene small molecule acceptors for P3HT based organic solar cells is reported. Green solvents are also selected using predicted Hansen solubility parameters.

Language: Английский

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Alkyl‐Chain Branching of Non‐Fullerene Acceptors Flanking Conjugated Side Groups toward Highly Efficient Organic Solar Cells

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(47)

Published: Oct. 29, 2021

Abstract Side‐chain modifications of non‐fullerene acceptors (NFAs) are essential for harvesting their full potential in organic solar cells (OSC). Here, an effective alkyl‐chain‐branching approach the Y‐series NFAs flanking meta‐substituted phenyl side groups at outer positions is demonstrated. Compared to BTP‐4F‐PC6 with linear m ‐hexylphenyl chains, two new named BTP‐4F‐P2EH and BTP‐4F‐P3EH developed bulkier alkyl chains branched β γ positions, respectively. These result altered molecular packing afford higher open‐circuit voltage devices. Despite blue‐shifted absorption branched‐chain NFAs, blends PBDB‐T‐2F enable improved short‐circuit current density corresponding devices owing more suitable phase separation better exciton dissociation. Consequently, OSCs based on yield enhanced device performance 18.22% 17.57%, respectively, outperforming BTP‐4F‐PC6‐based ones (17.22%). results highlight that side‐chain branching design has great optimizing properties promoting photovoltaic performance.

Language: Английский

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Central Unit Fluorination of Non‐Fullerene Acceptors Enables Highly Efficient Organic Solar Cells with Over 18 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(41)

Published: July 27, 2022

Halogenation of terminal acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) organic solar cells (OSCs). Similar significant results could be expected from the halogenation central units state-of-the-art Y-series acceptors. Herein, a pair acceptors, termed CH6 and CH4, featuring conjugation-extended phenazine unit with without fluorination, have synthesized. The fluorinated enhanced molecular interactions crystallinity, superior fibrillar network morphology improved charge generation transport blend films, thus affording higher PCE 18.33 % for CH6-based binary OSCs compared 16.49 non-fluorinated CH4. new site offers further opportunities structural optimization molecules afford better-performed reveals effectiveness fluorination on units.

Language: 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, Journal Year: 2022, Volume and Issue: 65(7), P. 1362 - 1373

Published: May 6, 2022

Language: Английский

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Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(8), P. 3519 - 3533

Published: Jan. 1, 2022

The diverse molecular stacking tuned by peripheral halogens in non-fullerene acceptors (NFAs) significantly affects the physicochemical properties, film morphologies and thus power conversion efficiencies (PCEs) of organic solar cells (OSCs).

Language: Английский

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3D acceptors with multiple A–D–A architectures for highly efficient organic solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(4), P. 1773 - 1782

Published: Jan. 1, 2023

Efficient 3D NFAs through central unit connection blaze a new trail in further molecular structural optimization of state-of-the-art NFAs.

Language: Английский

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Fused ring A–DA′D–A (Y-series) non-fullerene acceptors: recent developments and design strategies for organic photovoltaics

Journal of Materials Chemistry A, Journal Year: 2022, Volume and Issue: 10(35), P. 17968 - 17987

Published: Jan. 1, 2022

The fundamental principles of the molecular design Y-series NFAs (A–DA′D–A) are described, together with their achievements, comprehension, and impact on photoelectric characteristics, photovoltaic performance, film morphology.

Language: Английский

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Precise Control of Selenium Functionalization in Non‐Fullerene Acceptors Enabling High‐Efficiency Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(46)

Published: Sept. 20, 2022

Central π-core engineering of non-fullerene small molecule acceptors (NF-SMAs) is effective in boosting the performance organic solar cells (OSCs). Especially, selenium (Se) functionalization NF-SMAs considered a promising strategy but structure-performance relationship remains unclear. Here, we synthesize two isomeric alkylphenyl-substituted selenopheno[3,2-b]thiophene-based named mPh4F-TS and mPh4F-ST with different substitution positions, contrast them thieno[3,2-b]thiophene-based analogue, mPh4F-TT. When placing Se atoms at outer positions π-core, shows most red-shifted absorption compact molecular stacking. The PM6 : devices exhibit excellent absorption, high charge carrier mobility, reduced energy loss. Consequently, achieves more balanced photovoltaic parameters yields an efficiency 18.05 %, which highlights that precisely manipulating practicable way toward high-efficiency OSCs.

Language: Английский

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Impact of donor halogenation on reorganization energies and voltage losses in bulk-heterojunction solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(3), P. 1277 - 1290

Published: Jan. 1, 2023

The introduction of halogen atoms in the donor molecules organic solar cells leads to a decrease reorganization energy, which turn results reduced non-radiative voltage losses and an improved open-circuit devices.

Language: Английский

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