Molecular interaction induced dual fibrils towards organic solar cells with certified efficiency over 20%

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 10, 2024

The nanoscale fibrillar morphology, featuring long-range structural order, provides abundant interfaces for efficient exciton dissociation and high-quality pathways effective charge transport, is a promising morphology high performance organic solar cells. Here, we synthesize thiophene terminated non-fullerene acceptor, L8-ThCl, to induce the fibrillization of both polymer donor host that surpasses 20% efficiency milestone After adding original weak less continuous nanofibrils donors, i.e. PM6 or D18, are well enlarged refined, whilst acceptor L8-BO also assembles into with enhanced order. By adapting layer-by-layer deposition method, order can be retained significantly boost power conversion efficiency, specific values 19.4% 20.1% PM6:L8-ThCl/L8-BO:L8-ThCl D18:L8-ThCl/L8-BO:L8-ThCl devices, latter being certified 20.0%, which highest reported so far single-junction

Language: Английский

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Stability of organic solar cells: toward commercial applications

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(5), P. 2350 - 2387

Published: Jan. 1, 2024

Organic solar cells (OSCs) have attracted a great deal of attention in the field clean energy due to their advantages transparency, flexibility, low cost and light weight. Introducing them market enables seamless integration into buildings windows, while also supporting wearable, portable electronics internet-of-things (IoT) devices. With development photovoltaic materials optimization fabrication technology, power conversion efficiencies (PCEs) OSCs rapidly improved now exceed 20%. However, there is significant lack focus on material stability device lifetime, causing severe hindrance commercial applications. In this review, we carefully review important strategies employed improve over past three years from perspectives design engineering. Furthermore, analyze discuss current progress terms air, light, thermal mechanical stability. Finally, propose future research directions overcome challenges achieving highly stable OSCs. We expect that will contribute solving problem OSCs, eventually paving way for applications near future.

Language: Английский

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Trimerized small-molecule acceptors enable high-performance organic solar cells with high open-circuit voltage and prolonged life-time

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(8), P. 3339 - 3349

Published: Jan. 1, 2023

We report a new trimer acceptor (TYT) composed of three Y-based molecules connected by electron-donating spacers. The TYT enables high-performance and stable organic solar cell (OSC) with t 80% lifetime >8000 h under 1 sun illumination.

Language: Английский

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Ductile Oligomeric Acceptor‐Modified Flexible Organic Solar Cells Show Excellent Mechanical Robustness and Near 18% Efficiency

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(44)

Published: Aug. 22, 2023

High power conversion efficiency (PCE) and mechanical robustness are key requirements for wearable applications of organic solar cells (OSCs). However, almost all highly efficient photoactive films comprising polymer donors (PD ) small molecule acceptors (SMAs) mechanically brittle. In this study, (PCE = 17.91%) robust (crack-onset strain [COS] 11.7%) flexible OSCs fabricated by incorporating a ductile oligomeric acceptor (DOA) into the PD :SMA system, representing most to date. The photophysical, mechanical, photovoltaic properties D18:N3 with different DOAs characterized. By introducing DOA DOY-C4 longer alkyl linker lower polymerization, D18:N3:DOY-C4-based exhibit significantly higher PCE (17.91%) 50% COS (11.7%) than D18:N3-based device 17.06%, 7.8%). based on D18:N3:DOY-C4 retain 98% initial after 2000 consecutive bending cycles, showing greater stability reference (maintaining 89% PCE). After careful investigation, it is hypothesized that enhancement in mainly due formation tie chains or entanglement ternary blend films. These results demonstrate have great potential achieving high-performance OSCs.

Language: Английский

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High-Performance Intrinsically Stretchable Polymer Solar Cell with Record Efficiency and Stretchability Enabled by Thymine-Functionalized Terpolymer

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(22), P. 11914 - 11920

Published: May 23, 2023

Designing new polymer semiconductors for intrinsically stretchable solar cells (IS-PSCs) with high power conversion efficiency (PCE) and durability is critical wearable electronics applications. Nearly all high-performance PSCs are constructed using fully conjugated donors (PD) small-molecule acceptors (SMA). However, a successful molecular design of PDs mechanically durable IS-PSCs without sacrificing conjugation has not been realized. In this study, we novel thymine side chain terminated 6,7-difluoro-quinoxaline (Q-Thy) monomer synthesize series (PM7-Thy5, PM7-Thy10, PM7-Thy20) featuring Q-Thy. The Q-Thy units capable inducing dimerizable hydrogen bonding enable strong intermolecular PD assembly highly efficient robust PSCs. PM7-Thy10:SMA blend demonstrates combination PCE (>17%) in rigid devices excellent stretchability (crack-onset value >13.5%). More importantly, PM7-Thy10-based show an unprecedented (13.7%) ultrahigh mechanical (maintaining 80% initial after 43% strain), illustrating the promising potential commercialization

Language: Английский

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Hybrid Cycloalkyl‐Alkyl Chain‐Based Symmetric/Asymmetric Acceptors with Optimized Crystal Packing and Interfacial Exciton Properties for Efficient Organic Solar Cells

Advanced Science, Journal Year: 2023, Volume and Issue: 10(7)

Published: Jan. 2, 2023

Abstract Hybrid cycloalkyl‐alkyl side chains are considered a unique composite side‐chain system for the construction of novel organic semiconductor materials. However, there is lack fundamental understanding variations in single‐crystal structures as well optoelectronic and energetic properties generated by introduction hybrid electron acceptors. Herein, symmetric/asymmetric acceptors (Y‐C10ch A‐C10ch) bearing bilateral unilateral 10‐cyclohexyldecyl designed, synthesized, compared with symmetric acceptor 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐butyloctyl)‐3,9 bis(ethylhexyl)‐12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5] pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐ diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (L8‐BO). The stepwise decreases optical bandgap, deepens energy level, enables molecules to pack closely regular manner. Crystallographic analysis demonstrates that chain endows more planar skeleton enforces compact 3D network packing, resulting an active layer higher domain purity. Moreover, affects donor/acceptor interfacial energetics accelerates exciton dissociation, enabling power conversion efficiency (PCE) >18% 2,2′‐((2Z,2′Z)‐((12,13‐bis(2‐ethylhexyl)‐3,9‐diundecyl12,13‐dihydro‐[1,2,5]thiadiazolo[3,4‐e]thieno[2″,3″′:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2‐g]thieno[2′,3′:4,5]thieno[3,2‐b]indole‐2,10‐diyl)bis(methanylylidene))bis(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (Y6) (PM6):A‐C10ch‐based solar cells (OSCs). Importantly, incorporation Y‐C10ch third component PM6:L8‐BO blend results PCE 19.1%. superior molecular packing behavior highlighted here fabrication high‐performance OSCs.

Language: Английский

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Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High‐Performance Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(30)

Published: April 19, 2023

Terpolymerization and regioisomerization strategies are combined to develop novel polymer donors overcome the difficulty of improving organic solar cells (OSCs) performance. Two isomeric units, bis(2-hexyldecyl)-2,5-bis(4-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTO) bis(2-hexyldecyl) 2,5-bis(3-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTI), obtained incorporated into PM6 backbone via random copolymerization form a series terpolymers. Interestingly, it is found that different chlorine (Cl) substituent positions can significantly change molecular planarity electrostatic potential (ESP) owing steric hindrance effect heavy Cl atom, which leads aggregation behaviors miscibility between donor acceptor. The TTO unit features higher number multiple S···O non-covalent interactions, more positive ESP, fewer isomer structures than TTI. As result, terpolymer PM6-TTO-10 exhibits much better coplanarity, stronger crystallinity, obvious behavior, proper phase separation in blend film, conducive efficient exciton dissociation charge transfer. Consequently, PM6-TTO-10:BTP-eC9-based OSCs achieve champion power conversion efficiency 18.37% with an outstanding fill factor 79.97%, among highest values reported for terpolymer-based OSCs. This work demonstrates terpolymerization approach achieving high-performance donors.

Language: Английский

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Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(24)

Published: March 17, 2023

High power conversion efficiency (PCE) and stretchability are the dual requirements for wearable application of polymer solar cells (PSCs). However, most efficient photoactive films mechanically brittle. In this work, highly (PCE = 18%) robust (crack-onset strain (COS) PSCs acheived by designing block copolymer (BCP) donors, PM6-b-PDMSx (x 5k, 12k, 19k). these BCP stretchable poly(dimethylsiloxane) (PDMS) blocks covalently linked with PM6 to effectively increase stretchability. The donors increases a longer PDMS block, PM6-b-PDMS19k :L8-BO PSC exhibits high PCE (18%) 9-times higher COS value compared that (COS 2%) PM6:L8-BO-based PSC. PM6:L8-BO:PDMS12k ternary blend shows inferior (5%) (1%) due macrophase separation between active components. intrinsically PSC, significantly greater mechanical stability PCE80% ((80% initial PCE) at 36% strain) than those PM6:L8-BO (PCE80% 12% PM6:L8-BO:PDMS 4% strain). This study suggests an effective design strategy PD achieve PSCs.

Language: Английский

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Achieving Desired Pseudo‐Planar Heterojunction Organic Solar Cells via Binary‐Dilution Strategy

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(3)

Published: Oct. 13, 2023

The sequential deposition process has demonstrated the great possibility to achieve a photolayer architecture with an ideal gradient phase separation morphology, which vital influence on physical processes that determine performance of organic solar cells (OSCs). However, controllable preparation pseudo-planar heterojunction (P-PHJ) distribution not been effectively elucidated. Herein, binary-dilution strategy is proposed, PM6 solution micro acceptor BO-4Cl and L8-BO donor respectively, form P-PHJ film. This exists good (D) (A) vertical larger D/A interpenetrating regions, promotes exciton generation dissociation, shortens charge transport distance optimizes carrier dynamics. Moreover, dilution by regulation active layer aggregation size purity, thus alleviating energy disorder voltage loss. As result, device exhibits outstanding power conversion efficiency 19.32% excellent short-circuit current density 26.92 mA cm

Language: Английский

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Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(10), P. 5909 - 5919

Published: March 6, 2023

Organic photovoltaics (OPVs) have achieved great progress in recent years due to delicately designed non-fullerene acceptors (NFAs). Compared with tailoring of the aromatic heterocycles on NFA backbone, incorporation conjugated side-groups is a cost-effective way improve photoelectrical properties NFAs. However, modifications also need consider their effects device stability since molecular planarity changes induced by are related aggregation and evolution blend morphology under stresses. Herein, new class NFAs local-isomerized developed impact local isomerization geometries performance/stability systematically investigated. The based one isomers balanced side- terminal-group torsion angles can deliver an impressive power conversion efficiency (PCE) 18.5%, low energy loss (0.528 V) excellent photo- thermal stability. A similar approach be applied another polymer donor achieve even higher PCE 18.8%, which among highest efficiencies obtained for binary OPVs. This work demonstrates effectiveness applying fine-tune side-group steric effect non-covalent interactions between therefore improving both photovoltaic performance fused ring NFA-based

Language: Английский

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