Low‐Volatility Fused‐Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 12, 2025

Abstract Volatile solid additives (VSAs) with single or fused‐ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms high‐volatility single‐ring been well studied, influence low‐volatility VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6‐dibromothieno[3,2‐b]thiophene (3,6TTBr) is selected as a representative VSA to elucidate its mechanism. Via theoretical experimental joint investigation, it found that rigid planar 3,6TTBr molecules adsorb onto terminal units L8‐BO (acceptor), inducing loose space adjacent molecules. The thus favors center‐terminal packing larger interfragment distance, which relieves over‐aggregation induces ordered packing. Consequently, treatment reduces aggregation‐caused quenching, photoluminescence quantum yield exciton lifetime film. combination above properties reduced trap density improved carrier transport in 3,6TTBr‐treated devices contributed PCE 20.1%. To validate broad applicability findings, 1,5‐dibromonaphthalene (1,5‐BN), another solid, explored. 1,5‐BN achieved an impressive 20.5%, verifying validity strategy boosting OSC performances.

Язык: Английский

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Volatile Imide Additives with Large Dipole and Special Film Formation Kinetics Enable High‐Performance Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Large dipole moment additives have strong interactions with the host materials, which can optimize morphology and improve photovoltaic performance of organic solar cells (OSCs). However, these are difficult to remove due their intermolecular interactions, may impair stability. Developing volatile large moments is challenging. Herein, we first report imide that could effectively OSCs through modification. Three N-(o-chlorophenyl)phthalimide (oClPA), N-(m-chlorophenyl)phthalimide (mClPA), N-(p-chlorophenyl)phthalimide (pClPA) were screened investigate effort positional isomerization on molecular configuration interaction. These (ClPAs) larger (2.0664 Debye for oClPA, 4.2361 mClPA, 4.7896 pClPA) compared reported solid additives. In contrast traditional simultaneous nucleation crystal growth, ClPAs induce acceptor nucleate then grow, contributes forming high-quality domains better crystallinity. To our knowledge, this unique film formation kinetics was first. The power conversion efficiency (PCE) based PM6:BTP-eC9 treated pClPA improved from 16.13 % 18.58 %. Additive also performed well in PM6:L8-BO, PM6:Y6, D18:L8-BO systems, a high PCE 19.04 achieved. Our results indicate using unit construct simple effective strategy, halogen atom has effect performance.

Язык: Английский

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Synergistically Halogenated and Methoxylated Thiophene Additive Enables High‐Performance Organic Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

Abstract Morphology control plays a key role for improving efficiency and stability of bulk heterojunctions (BHJ) organic solar cells (OSCs). Halogenation methoxylation are two separate ways successfully adopted in additives morphology optimization. In this work, these strategies combined together. A series halogenated methoxylated thiophenes is designed synthesized as volatile to the evolution BHJ morphology. Specifically, addition 2,5‐diiodo‐3,4‐dimethoxythiophene (MT‐I) prominently improves performance photostability OSCs. Computational simulations reveal noncovalent interactions MT‐I with active layer materials that corresponds inhibition excessive aggregation behavior PM6 Y6 during film‐forming process, facilitating favorable phase separation enhanced molecular stacking. Consequently, PM6:Y6‐based binary OSCs treatment achieves high PCE 17.93%. Furthermore, demonstrates broad feasibility across diverse high‐efficiency OSCs, leading superior photovoltaic (PCE over 18%). This study offers valuable guidance design application high‐performance future endeavors.

Язык: Английский

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Phenothiazine-Based Solid Additives for Optimizing Film Morphologies in High-Performance Organic Photovoltaics

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

Язык: Английский

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Recent Advances in Thermo- and Photostabilities of Organic Solar Cells: Material Design and Morphology Control

Polymer science & technology., Год журнала: 2025, Номер unknown

Опубликована: Фев. 27, 2025

Язык: Английский

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Volatile Imide Additives with Large Dipole and Special Film Formation Kinetics Enable High‐Performance Organic Solar Cells

Angewandte Chemie, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Abstract Large dipole moment additives have strong interactions with the host materials, which can optimize morphology and improve photovoltaic performance of organic solar cells (OSCs). However, these are difficult to remove due their intermolecular interactions, may impair stability. Developing volatile large moments is challenging. Herein, we first report imide that could effectively OSCs through modification. Three N ‐( o ‐chlorophenyl)phthalimide ( ClPA), m p ClPA) were screened investigate effort positional isomerization on molecular configuration interaction. These (ClPAs) larger (2.0664 Debye for ClPA, 4.2361 4.7896 compared reported solid additives. In contrast traditional simultaneous nucleation crystal growth, ClPAs induce acceptor nucleate then grow, contributes forming high‐quality domains better crystallinity. To our knowledge, this unique film formation kinetics was first. The power conversion efficiency (PCE) based PM6:BTP‐eC9 treated ClPA improved from 16.13 % 18.58 %. Additive also performed well in PM6:L8‐BO, PM6:Y6, D18:L8‐BO systems, a high PCE 19.04 achieved. Our results indicate using unit construct simple effective strategy, halogen atom has effect performance.

Язык: Английский

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Balanced Crystallization Enhances Morphology and Efficiency in Binary Organic Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 21, 2025

Abstract Achieving high‐performance organic solar cells (OSCs) relies heavily on precise morphology optimization, a challenging task due to the intrinsic differences in crystallization kinetics and interfacial compatibility between polymer donors small‐molecule acceptors. In this work, 2,7‐dibromonaphthalene (DBN) is introduced as an innovative solid additive that uniquely regulates both donor acceptor phases within PM6:Y6 system. Unlike conventional liquid additives, which often induce excessive Y6 crystallization, DBN achieves balanced enhancing molecular order PM6 while mitigating over‐aggregation Y6. This dual‐phase effect improves light absorption, exciton generation dissociation, charge transport, reduces recombination losses. As result, OSCs treated with achieved remarkable power conversion efficiency (PCE) of 18.5%, open‐circuit voltage ( V OC ) 0.848 V, high short‐circuit current density J SC 28.15 mA cm −2 , enhanced fill factor (FF) 77.7%. Adding anti‐reflection MgF 2 layer further boosts 19.0%, setting new benchmark for binary devices. study establishes promising regulator presents robust strategy control, advancing development photovoltaic applications.

Язык: Английский

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Tailoring selenium alkyl chain-containing small molecule donor enables efficient ternary solar cells with reduced charge recombination

Chemical Engineering Journal, Год журнала: 2025, Номер 513, С. 163009 - 163009

Опубликована: Апрель 23, 2025

Язык: Английский

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High Efficiency Non‐Halogenated Solvent Processed Organic Solar Cells Through Synergistic Effects of Layer‐by‐Layer and Solid Additive

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 24, 2025

Abstract In the field of organic solar cells (OSCs), bulk heterojunction (BHJ) structure is most widely used. On contrary, layer‐by‐layer (LBL) gives a p‐i‐n separation where donor close to transparent electrode while acceptor reflective electrode, which shows be an ideal for OSCs. this work, volatile solid additives 2,5‐dibromoprazine (DBP) and 2‐bromine‐5‐iodopyrazine (BIP) are introduced regulate morphology LBL active layers. Comprehensive analysis reveals that DBP BIP can promote stronger molecular packing crystallinity BTP‐eC9, resulting in higher charge mobility, more efficient separation, suppressed bimolecular recombination significantly improve device filling factor (FF), especially devices. Consequently, by combining engineering additive BIP, outstanding power conversion efficiency (PCE) 19.63% based on PM1/BTP‐eC9 achieved further applied PM1/BTP‐eC9:eC9‐2Cl ternary system, PCE exceeded 20%. The results provide comprehensive insights into synergistic effect high‐performance photovoltaics.

Язык: Английский

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Organic Solar Cell with Efficiency of 20.49% Enabled by Solid Additive and Non‐Halogenated Solvent

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 26, 2025

Abstract Recently, benzene‐based solid additives (BSAs) have emerged as pivotal components in modulating the morphology of blend film organic solar cells (OSCs). However, since almost all substituents on BSAs are weak electron‐withdrawing groups and contain halogen atoms, study with non‐halogenated strong has received little attention. Herein, an additive strategy is proposed, involving incorporation benzene ring. An effective BSA, 4‐nitro‐benzonitrile (NBN), selected to boost efficiency devices. The results demonstrate that NBN‐treated device exhibits enhanced light absorption, superior charge transport performance, mitigated recombination, more optimal compared additive‐free OSC. Consequently, D18:BTP‐eC9+NBN‐based binary D18:L8‐BO:BTP‐eC9+NBN‐based ternary OSC processed by solvent achieved outstanding efficiencies 20.22% 20.49%, respectively. Furthermore, universality NBN also confirmed different active layer systems. In conclusion, this work demonstrates introduction electron‐absorbing moieties ring a promising approach design BSAs, which can tune achieve highly efficient devices, certain guiding significance for development BSAs.

Язык: Английский

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