Strengthening the Hetero‐Molecular Interactions in Giant Dimeric Acceptors Enables Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Nov. 23, 2023

Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.

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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Non‐Fully Conjugated Dimerized Giant Acceptors with Different Alkyl‐Linked Sites for Stable and 19.13 % Efficiency Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(14)

Published: Feb. 9, 2024

Abstract Achieving both high power conversion efficiency (PCE) and device stability is a major challenge for the practical development of organic solar cells (OSCs). Herein, three non‐fully conjugated dimerized giant acceptors (named 2Y‐sites, including wing‐site‐linked 2Y‐wing, core‐site‐linked 2Y‐core, end‐site‐linked 2Y‐end) are developed. They share similar monomer precursors but have different alkyl‐linked sites, offering fine‐tuned molecular absorption, packing, glass transition temperature, carrier mobility. Among their binary active layers, D18/2Y‐wing has better miscibility, leading to optimized morphology more efficient charge transfer compared D18/2Y‐core D18/2Y‐end. Therefore, D18/2Y‐wing‐based OSCs achieve superior PCE 17.73 %, attributed enhanced photocurrent fill factor. Furthermore, exhibit balance improved stability, distinguishing them within 2Y‐sites. Building on success 2Y‐wing in systems, we extend its application ternary by pairing it with near‐infrared absorbing D18/BS3TSe‐4F host. Thanks complementary absorption 300–970 nm further morphology, obtain higher 19.13 setting new benchmark dimer‐derived OSCs. This approach site engineering constructing presents promising pathway improve

Language: Английский

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Tethered Trimeric Small‐molecular Acceptors through Aromatic‐core Engineering for Highly Efficient and Thermally Stable Polymer Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(15)

Published: Feb. 7, 2024

Polymer solar cells (PSCs) rely on a blend of small molecular acceptors (SMAs) with polymer donors, where thermodynamic relaxation SMAs poses critical concerns operational stability. To tackle this issue, tethered SMAs, wherein multiple SMA-subunits are connected to the aromatic-core via flexible chains, proposed. This design aims an elevated glass transition temperature (T

Language: Английский

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High efficiency and thermally stable ternary all-polymer solar cells achieved by alloyed vinyl-linked polymerized small-molecule acceptors

Nano Energy, Journal Year: 2024, Volume and Issue: 122, P. 109338 - 109338

Published: Jan. 25, 2024

Language: Английский

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