Insight Into Designing High‐Performance Polythiophenes for Reduced Urbach Energy and Nonradiative Recombination in Organic Solar Cells DOI
Zhe Sun,

Hayoung Ma,

Sangjin Yang

и другие.

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Апрель 18, 2024

Abstract In the pursuit of high‐efficiency polythiophene (PT) organic solar cells (OSCs), a critical challenge is reduction nonradiative recombination. This study comprehensively explores polydithienylthiazolothiazole (PTTz)‐based PT terpolymers: PTTz‐Tz and PTTz‐TzT, in which it demonstrate that molecular structure alterations greatly influence aggregation kinetics orientation these polymers. Specifically, PTTz‐TzT achieves rapid ordering during spin coating, effectively suppressing excessive polymer facilitating appropriate phase separation upon mixing with acceptor. Meanwhile, inherently adopts face‐on orientation, resulting more structured π–π stacking vertical direction after acceptor integration, compared to intrinsic edge‐on PTTz‐Tz. These factors collectively contribute lower Urbach energy substantial recombination PTTz‐TzT‐based OSCs, culminating high photovoltaic conversion efficiency (PCE) exceeding 16%. Furthermore, prominent PCE 19.11% obtained by via ternary blend strategy, among highest values reported for OSCs. investigation underscores significance PT‐based polymers, especially regarding recombination, offers novel insights designing high‐performance donors.

Язык: Английский

Achieving 19% Power Conversion Efficiency in Planar‐Mixed Heterojunction Organic Solar Cells Using a Pseudosymmetric Electron Acceptor DOI
Wei Gao, Qi Feng, Zhengxing Peng

и другие.

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

Процитировано

401

19.7% efficiency binary organic solar cells achieved by selective core fluorination of nonfullerene electron acceptors DOI Creative Commons
Kerui Liu, Yuanyuan Jiang, Guangliu Ran

и другие.

Joule, Год журнала: 2024, Номер 8(3), С. 835 - 851

Опубликована: Янв. 30, 2024

Язык: Английский

Процитировано

160

High-Efficiency Ternary Organic Solar Cells with a Good Figure-of-Merit Enabled by Two Low-Cost Donor Polymers DOI
Ruijie Ma, Cenqi Yan, Jiangsheng Yu

и другие.

ACS Energy Letters, Год журнала: 2022, Номер 7(8), С. 2547 - 2556

Опубликована: Июль 13, 2022

Here, we combine two donor polymers with a relatively short synthesis method and fabricate ternary organic solar cells (OSCs) high efficiency decent figure-of-merit. A series of characterizations show that the optimal morphology blend is result coupling competition PTQ10 PTVT-T, where molecular packing phase separation motif broken but strong aggregation PTVT-T suppressed, resulting in efficient charge transport collection, as well suppressed bimolecular recombination. Moreover, previously reported solvent-vapor-assisted casting method, taken an understanding-guided optimization, pushes system's to 19.11%. Furthermore, PTVT-T-containing systems clearly better light soaking thermal stability than binary control system, benefiting from durable polymer matrix. Our work provides useful approach for developing efficient, stable, low-cost OSCs based on state-of-the-art donor/acceptor through design.

Язык: Английский

Процитировано

138

Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells DOI
Yalu Zou, Hongbin Chen,

Xingqi Bi

и другие.

Energy & Environmental Science, Год журнала: 2022, Номер 15(8), С. 3519 - 3533

Опубликована: Янв. 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).

Язык: Английский

Процитировано

115

19.28% Efficiency and Stable Polymer Solar Cells Enabled by Introducing an NIR‐Absorbing Guest Acceptor DOI
Qunping Fan, Ruijie Ma, Zhaozhao Bi

и другие.

Advanced Functional Materials, Год журнала: 2023, Номер 33(8)

Опубликована: Янв. 6, 2023

Abstract Here, a near‐infrared (NIR)‐absorbing small‐molecule acceptor (SMA) Y‐SeNF with strong intermolecular interaction and crystallinity is developed by combining selenophene‐fused core naphthalene‐containing end‐group, then as custom‐tailor guest incorporated into the binary PM6:L8‐BO host system. shows 65 nm red‐shifted absorption compared to L8‐BO. Thanks of Y‐SeNF, morphology PM6:L8‐BO:Y‐SeNF can be precisely regulated introducing achieving improved charge‐transporting suppressed non‐radiative energy loss. Consequently, ternary polymer solar cells (PSCs) offer an impressive device efficiency 19.28% both high photovoltage (0.873 V) photocurrent (27.88 mA cm −2 ), which one highest efficiencies in reported single‐junction PSCs. Notably, PSC has excellent stability under maximum‐power‐point tracking for even over 200 h, better than its parental devices. The study provides novel strategy construct NIR‐absorbing SMA efficient stable PSCs toward practical applications.

Язык: Английский

Процитировано

103

Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells DOI Creative Commons

Qingqing Bai,

Qiming Liang,

Henan Li

и другие.

Aggregate, Год журнала: 2022, Номер 3(6)

Опубликована: Окт. 13, 2022

Abstract The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development fused‐ring electron acceptors (FREAs). Currently, FREAs‐based OSCs achieved high PCEs over 19% single‐junction OSCs. Whereas relatively synthetic complexity and low yield FREAs typically result production costs, hindering commercial application In contrast, noncovalently (NFREAs) can compensate for shortcomings facilitate large‐scale industrial by virtue simple structure, facile synthesis, yield, cost, reasonable efficiency. At present, based on NFREAs exceeded 15% are expected to reach comparable efficiency as Here, advances this review provide insight into improving performance particular, paper focuses effect chemical structures molecule conformation, aggregation, packing mode. Various molecular design strategies, such core, side‐chain, terminal group engineering, presented. addition, some novel polymer all‐polymer also introduced. end, provides an outlook developing efficient, stable, low‐cost achieving applications.

Язык: Английский

Процитировано

101

Electrostatic force promoted intermolecular stacking of polymer donors toward 19.4% efficiency binary organic solar cells DOI Creative Commons

Zirui Gan,

Liang Wang,

Jinlong Cai

и другие.

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

Опубликована: Окт. 9, 2023

Conjugated polymers are generally featured with low structural order due to their aromatic and irregular units, which limits light absorption charge mobility in organic solar cells. In this work, we report a conjugated molecule INMB-F that can act as molecular bridge via electrostatic force enhance the intermolecular stacking of BDT-based polymer donors toward efficient stable Molecular dynamics simulations synchrotron X-ray measurements reveal electronegative adsorb on electropositive main chain increase donor-donor interactions, leading enhanced shortened π-π distance consequently transport ability. Casting non-fullerene acceptor layer top modified donor fabricate cells layer-by-layer deposition evidences significant power conversion efficiency boosts range photovoltaic systems. A 19.4% (certified 18.96%) is realized PM6/L8-BO binary devices, one highest reported efficiencies material system. The by also leads six-fold enhancement operational stability

Язык: Английский

Процитировано

101

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

Mengyun Jiang,

Hong‐Fu Zhi,

Bao Zhang

и другие.

ACS Energy Letters, Год журнала: 2023, Номер 8(2), С. 1058 - 1067

Опубликована: Янв. 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.

Язык: Английский

Процитировано

97

High‐Performance Organic Solar Cells Containing Pyrido[2,3‐b]quinoxaline‐Core‐Based Small‐Molecule Acceptors with Optimized Orbit Overlap Lengths and Molecular Packing DOI
Tongle Xu, Zhenghui Luo, Ruijie Ma

и другие.

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(30)

Опубликована: Май 26, 2023

Abstract The central core in A‐DA 1 D‐A‐type small‐molecule acceptor (SMAs) plays an important role determining the efficiency of organic solar cells (OSCs), while principles governing efficient design SMAs remain elusive. Herein, we developed a series with pyrido[2,3‐ b ]quinoxaline (PyQx) as new electron‐deficient unit by combining cascade‐chlorination strategy, namely Py1, Py2, Py3, Py4 and Py5. introduction chlorine atoms reduces intramolecular charge transfer effects but elevates LUMO values. Density functional theory (DFT) reveals that Py2 ortho substituted PyQx Py5 two yield larger dipole moments smaller π⋅⋅⋅π stacking distances, compared other three acceptors. Moreover, shows strongest light absorption capability induced extended orbit overlap lengths more packing structures dimers. These features endow best device performance due to better molecular aggregation behaviors, suitable domain sizes exciton dissociation recombination. This study highlights significance incorporating large moments, small distances dimers into development high‐performance SMAs, providing insight for OSCs.

Язык: Английский

Процитировано

82

Side-chain engineering of nonfullerene small-molecule acceptors for organic solar cells DOI
Zhenghui Luo, Tongle Xu, Cai’e Zhang

и другие.

Energy & Environmental Science, Год журнала: 2023, Номер 16(7), С. 2732 - 2758

Опубликована: Янв. 1, 2023

This review summarizes the side-chain engineering of nonfullerene small-molecule acceptors (SMAs) in field organic solar cells, discusses key structure–property relationships depth and future directions engineering.

Язык: Английский

Процитировано

77