Recent advances in PM6:Y6-based organic solar cells

Materials Chemistry Frontiers, Journal Year: 2021, Volume and Issue: 5(8), P. 3257 - 3280

Published: Jan. 1, 2021

This review provides a detailed overview of PM6:Y6-based organic solar cells (OSCs), including the underlying mechanisms, terpolymers derived from PM6, ternary or quaternary OSCs, interfacial engineering and electrode progress.

Language: Английский

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Precise synthesis and photovoltaic properties of giant molecule acceptors

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Dec. 2, 2023

Series of giant molecule acceptors DY, TY and QY with two, three four small acceptor subunits are synthesized by a stepwise synthetic method used for systematically investigating the influence subunit numbers on structure-property relationship from YDT to polymerized PY-IT. Among these acceptors-based devices, TY-based film shows proper donor/acceptor phase separation, higher charge transfer state yield longer lifetime. Combining highest electron mobility, more efficient exciton dissociation lower carrier recombination properties, device exhibits power conversion efficiency 16.32%. These results indicate that number in has significant their photovoltaic properties. This will be beneficial diversify structures promote applications high-efficiency stable organic solar cells.

Language: Английский

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Approach toward Low Energy Loss in Symmetrical Nonfullerene Acceptor Molecules Inspired by Insertion of Different π-Spacers for Developing Efficient Organic Solar Cells

ACS Omega, Journal Year: 2023, Volume and Issue: 8(46), P. 43792 - 43812

Published: Nov. 10, 2023

In this quantum approach, by adding bridge/π-spacer fragments between the donor and acceptor parts of a newly constructed DF-PCIC (A-D-A type) molecule, it is aim to improve photovoltaic characteristics organic solar cells (OSCs). After π-spacer insertion into reference molecule (DF-R), six new molecules (DF-M1 DF-M6) were designed. The optoelectronic attributes inspected theoretically calculated using MPW1PW91/6-31G(d,p) level theory. All proposed possessed lower band gap (Eg), higher value absorption, reorganization energy, greater dipole moment, energies excitations than DF-R molecule. frontier molecular orbital study proclaimed that DF-M1 has lowest 1.62 eV in comparison 2.41 DF-R. Absorption properties represented DF-M2 show highest absorption values up 1006 1004 nm, respectively, near-infrared region. Regarding λe (0.0683896 eV) λh (0.1566471 eV). DF-M5 manifested moments with 5.514665 7.143434 D, respectively. open circuit voltage (VOC) all acceptors was J61, complex. DF-M4 DF-M6 showed VOC fill factor Based on given results, supposed presented might prove themselves be better thus great interest experimentalists. Thus, they are suggested used develop proficient OSC devices improved prospects near future.

Language: Английский

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3D Crystal Framework Regulation Enables Se‐Functionalized Small Molecule Acceptors Achieve Over 19% Efficiency

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(19)

Published: March 10, 2024

Abstract Se‐functionalized small molecule acceptors (SMAs) exhibit unique advantages in constructing materials with near‐infrared absorption, but their photovoltaic performance lags behind that of S‐containing analogs organic solar cells (OSCs). Herein, two new Se‐containing SMAs, namely Se‐EH and Se‐EHp, are designed synthesized by regulating bifurcation site outer alkyl chain, which enables Se‐EHp to form different 3D crystal frameworks from CH1007. displays tighter π–π stacking denser packing framework smaller‐sized pore structure induced larger steric hindrance effect chain branched at 2‐position, a higher dielectric constant PM6:Se‐EH active layer can be obtained. OSCs based on achieved very high PCEs 18.58% binary 19.03% ternary devices FF approaching 80% for SMAs. A more significant adjusts the molecular crystallization favorable nanofiber interpenetrating network an appropriate domain size reduce rate sub‐ns recombination promote balanced transport carriers. This work provides references further design development highly efficient

Language: Английский

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Random Polymerization Strategy Leads to a Family of Donor Polymers Enabling Well‐Controlled Morphology and Multiple Cases of High‐Performance Organic Solar Cells

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(52)

Published: Nov. 13, 2020

Abstract Developing high‐performance donor polymers is important for nonfullerene organic solar cells (NF‐OSCs), as state‐of‐the‐art acceptors can only perform well if they are coupled with a matching suitable energy levels. However, there very limited choices of NF‐OSCs, and the most commonly used ones named PM6 PM7, which suffer from several problems. First, performance these (particularly PM7) relies on precise control their molecular weights. Also, optimal morphology extremely sensitive to any structural modification. In this work, family developed based random polymerization strategy. These achieve well‐controlled variety chemical structures The polymer donors D–A1–D–A2‐type copolymers in D A1 units monomers originating or while A2 unit comprises an electron‐deficient core flanked by two thiophene rings branched alkyl chains. Consequently, multiple cases highly efficient NF‐OSCs achieved efficiencies between 16.0% 17.1%. As cores be changed many other units, strategy easily expand NF‐OSCs.

Language: Английский

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Wide bandgap polymer donors for high efficiency non-fullerene acceptor based organic solar cells

Materials Advances, Journal Year: 2020, Volume and Issue: 2(1), P. 115 - 145

Published: Nov. 13, 2020

Structural design and processing of wide bandgap (WBG) polymer donors for non-fullerene acceptors ITIC, IT-4F, Y6 to achieve ultrahigh efficiency are discussed.

Language: Английский

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Recent progress in reducing voltage loss in organic photovoltaic cells

Materials Chemistry Frontiers, Journal Year: 2020, Volume and Issue: 5(2), P. 709 - 722

Published: Oct. 14, 2020

ESP modulation can be regarded as a potential molecular design strategy to improve efficiencies of OPVs by reducing voltage losses.

Language: Английский

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Hammer throw-liked hybrid cyclic and alkyl chains: A new side chain engineering for over 18 % efficiency organic solar cells

Nano Energy, Journal Year: 2022, Volume and Issue: 101, P. 107538 - 107538

Published: June 23, 2022

Language: Английский

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Role of Exciton Lifetime, Energetic Offsets, and Disorder in Voltage Loss of Bulk Heterojunction Organic Solar Cells

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(2), P. 3214 - 3223

Published: Jan. 5, 2023

Recently, the power conversion efficiency (PCE) of organic solar cells (OSCs) has significantly progressed with a rapid increase from 10 to 19% due state-of-the-art research on nonfullerene acceptor molecules and various device processing strategies. However, OSCs still exhibit significant open circuit voltage loss (ΔVOC ∼ 0.6 V) high energetic offsets molecular disorder. In this work, we present systematic investigation determine effects offset disorder different recombination losses in (VOC) using 13 photoactive layers, wherein PCE ΔVOC vary ranges 2.21-14.74% 0.561-1.443 V, respectively. The detailed analysis all these devices was carried out, were correlated This enabled us identify key features for minimizing like: (1) low energy between donor states is essential attain nonradiative (ΔVOC, nrad) as ∼200 meV (2) Urbach energy, which measure materials' packing, should be minimization radiative rad). addition, time-resolved photoluminescence spectroscopy employed further understand exciton dynamics pristine materials donor-acceptor blends. It observed that absorbers ultralong lifetime (∼1000 ps) produce higher efficiencies. current study emphasizes importance simultaneously testing photovoltaic performance active layer rational optimization opens new prospects designing novel fine-tuning longer effective strategy boost their modified Shockley-Queisser (SQ) limit by losses.

Language: Английский

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Enhanced Charge Transport and Broad Absorption Enabling Record 18.13% Efficiency of PM6:Y6 Based Ternary Organic Photovoltaics with a High Fill Factor Over 80%

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(13)

Published: Dec. 14, 2021

Abstract Ternary architecture is an efficient strategy to boost desired power conversion efficiency of single‐junction organic solar cells (OSCs). Here, a ternary OSC by incorporating compatible acceptor ITIC‐M as third component into state‐of‐the‐art PM6:Y6 blend reported, yielding 18.13% and impressive fill factor 80.10%. The the highest record for based devices reported date. full advantages designed heterojunction are good complementary light absorption that increases photocurrent, matched interfacial electronic structures featuring so‐called pinning energies facilitate exciton separation suppress charge recombination loss. Furthermore, plays vital role in optimizing micromorphology with better dispersity, well‐formed fibrillar structure enhanced crystallinity, thus boosting transport device performance.

Language: Английский

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