Amino‐Functionalized Graphdiyne Derivative as a Cathode Interface Layer with High Thickness Tolerance for Highly Efficient Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер 36(16)

Опубликована: Янв. 17, 2024

Abstract Efficient cathode interfacial materials (CIMs) are essential components for effectively enhancing the performance of organic solar cells (OSCs). Although high‐performance CIMs desired to meet requirements various OSCs, potential candidates scarce. Herein, an amino‐functionalized graphdiyne derivative (GDY‐N) is developed, which represents first example GDY that exhibits favorable solubility in alcohol. Utilizing GDY‐N as CIM, outstanding champion PCE 19.30% devices based on D18‐Cl:L8‐BO (certified result: 19.05%) achieved, among highest efficiencies reported date OSCs. Remarkably, exhibit a thickness‐insensitive characteristic, maintaining 95% their initial efficiency even with film thickness 25 nm. Moreover, displays wide universality and facilitates exceptional stability This work not only enriches diversity derivatives, but also demonstrates feasibility derivatives high tolerance

Язык: Английский

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Halogenation Strategy of Thiophene Derived Solvent Additives Enables Optimized Morphology for Organic Solar Cells with 19.17% Efficiency

Advanced Functional Materials, Год журнала: 2024, Номер 34(19)

Опубликована: Янв. 14, 2024

Abstract As simple and versatile tools, additives have been widely used to refine active layer morphology played a crucial role in boosting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, three novel solvent named Th‐FSi, Th‐ClSi, Th‐BrSi with same backbone 2,5‐bis(trimethylsilyl)thiophene are designed synthesized by substituting different halogens fluorine, chlorine, bromine, respectively. Notably, Th‐ClSi exhibits more significant dipole moment engages non‐covalent interactions small‐molecule acceptor (SMA) L8‐BO, which slight adjustments intermolecular interaction, crystallinity, molecular packing PM6:L8‐BO layer. Consequently, OSCs incorporating outperform their Th‐FSi counterparts photo‐capturing, reduced energy loss, superior exciton dissociation, charge transfer properties, out‐coming yields an enhanced PCE 18.29%. Moreover, integrating near‐infrared absorbing SMA (BTP‐eC9) guest into matrix, absorption spectrum span 880–930 nm, resultant ternary achieve commendable 19.17%, ranking among highest efficiencies reported date is expanded. These findings underscore promise halogenated thiophene‐based as potent avenue for morphological fine‐tuning consequent enhancement OSCs.

Язык: Английский

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Regulating Crystallinity Mismatch Between Donor and Acceptor to Improve Exciton/Charge Transport in Efficient Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(11)

Опубликована: Янв. 15, 2024

Abstract Achieving a more balanced charge transport by morphological control is crucial in reducing bimolecular and trap‐assisted recombination enhancing the critical parameters for efficient organic solar cells (OSCs). Hence, facile strategy proposed to reduce crystallinity difference between donor acceptor incorporating novel multifunctional liquid crystal small molecule (LCSM) BDTPF4‐C6 into binary blend. first LCSM based on tetrafluorobenzene unit features low phase transition temperature strong self‐assembly ability, conducive regulating active layer morphology. When introduced as guest PM6 : Y6 binary, it exhibits better compatibility with primarily resides within because of similarity‐intermiscibility principle. Moreover, systematic studies revealed that could be used seeding agent enhance its crystallinity, thereby forming favourable suppressed recombination. Intriguingly, dual Förster resonance energy transfer was observed host acceptor, resulting an improved current density. This study demonstrates approach balance mobilities offers new insights boosting efficiency single‐junction OSCs beyond 20 %.

Язык: Английский

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Dual‐Strategy Tailoring Molecular Structures of Dopant‐Free Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(20)

Опубликована: Март 19, 2024

Abstract Dopant‐free hole transport materials (HTMs) are ideal for highly efficient and stable n‐i‐p perovskite solar cells (PSCs), but most current design strategies tailoring the molecular structures of HTMs limited to single strategy. Herein, four based on dithienothiophenepyrrole (DTTP) core devised through dual‐strategy methods combining conjugate engineering side chain engineering. DTTP‐ThSO with ester alkyl that can form six‐membered ring by S⋅⋅⋅O noncovalent conformation lock thiophene in backbone shows good planarity, high‐quality film, matching energy level high mobility, as well strong defect passivation ability. Consequently, a remarkable power conversion efficiency (PCE) 23.3 % nice long‐term stability is achieved dopant‐free DTTP‐ThSO‐based PSCs, representing one highest values un‐doped organic PSCs. Especially, fill factor (FF) 82.3 value small HTMs‐based PSCs date. Moreover, devices have an excellent PCE 20.9 large‐area (1.01 cm 2 ) devices. This work clearly elucidates structure‐performance relationships offers practical approach designing high‐performance

Язык: Английский

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Design of robust fluorinated interpenetrating poly(thieno[3,2-b]thiophene) network for highly stable flexible electrochromic-supercapacitor devices

Chemical Engineering Journal, Год журнала: 2024, Номер 495, С. 153692 - 153692

Опубликована: Июль 2, 2024

Язык: Английский

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High Miscibility‐Induced Reduction of Trap Density in All‐Polymer Solar Cells Using Hybrid Cyclohexyl‐Hexyl Side Chains

Advanced Functional Materials, Год журнала: 2023, Номер 33(40)

Опубликована: Авг. 30, 2023

Abstract Reducing the trap density within organic solar cells is of vital importance to realize high power conversion efficiency (PCE); however, research focusing on this aspect limited in all‐polymer (All‐PSCs). In work, it found that can be dramatically reduced by simultaneously obtaining miscibility donor and acceptor ordered packing blend films through substituting ethylhexyl with hybrid cyclohexyl‐hexyl side chains design polymer donor. D18‐ChCl has a slightly lower aggregation behavior relative D18‐Cl counterpart, but reveals synchronously higher crystallinity PYF‐T‐o. Such morphology evolution positively affects electronic properties device—prolongs carrier lifetime, facilitates exciton dissociation, lowers energy disorder. As result, All‐PSC devices based exhibited remarkable PCE 17.1%, low 2.65 × 10 15 cm −3 , disorder 47 meV as well outstanding stability mechanical durability. This result demonstrates alkyl engineering delicately improves miscibility, drives density, refines device performance, which brings vibrancy field.

Язык: Английский

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Current State and Future Perspectives of Printable Organic and Perovskite Solar Cells

Advanced Materials, Год журнала: 2023, Номер 36(17)

Опубликована: Окт. 12, 2023

Abstract Photovoltaic technology presents a sustainable solution to address the escalating global energy consumption and reliable strategy for achieving net‐zero carbon emissions by 2050. Emerging photovoltaic technologies, especially printable organic perovskite solar cells, have attracted extensive attention due their rapidly transcending power conversion efficiencies facile processability, providing great potential revolutionize market. To accelerate these technologies translate from laboratory scale industrial level, it is critical develop well‐defined scalable protocols deposit high‐quality thin films of photoactive charge‐transporting materials. Herein, current state cells summarized view regarding challenges prospects toward commercialization shared. Different printing techniques are first introduced provide correlation between material properties mechanisms, optimization ink formulation film‐formation during large‐area deposition different functional layers in devices then discussed. Engineering perspectives also discussed analyze criteria module design. Finally, provided future development practical commercialization. It believed that this perspective will insight into other electronic devices.

Язык: Английский

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Dimerized small molecular acceptors: Regulation of dimer conformation realizes binary organic solar cells with highly comprehensive performance

Nano Energy, Год журнала: 2023, Номер 121, С. 109218 - 109218

Опубликована: Дек. 20, 2023

Язык: Английский

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Effect of 1‐Fluoro‐2‐iodobenzene Solvent Additive on the Crystallization of Donors and Acceptors, and Ultrafast Carrier Dynamics in Polymer Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 15, 2023

Abstract Controlled sequential crystallization of donors and acceptors is a critical factor for achieving enhanced phase separation efficient charge transfer performance in polymer solar cells (PSCs). In this study, comprehensive investigation structurally simple solvent additive, 1‐fluoro‐2‐iodobenzene (OFIB) conducted, which efficiently controls the morphology active layer, resulting fibrous assembly significantly enhancing power conversion efficiency from 16.34% to 18.38% based on PM6:L8‐BO system. Density functional theory, molecular dynamics simulations, grazing incidence small‐ wide‐angle X‐ray scattering techniques reveal that addition OFIB processed blend aligns orientation acceptor molecules, thereby overall π–π stacking layer. establishes nearly equal‐strength interactions with conjugated frameworks both donor materials, benefiting multiple electron conjugation between its iodine atom framework Femtosecond‐timescale photophysical studies demonstrate OFIB‐optimized layer shows reduced exciton losses at donor–acceptor interface. This study offers new perspective mechanism underlying function additives presents research methodology will guide development next‐generation non‐fullerene PSCs.

Язык: Английский

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Correlating Aggregation Ability of Polymer Donors with Film Formation Kinetics for Organic Solar Cells with Improved Efficiency and Processability

Advanced Materials, Год журнала: 2024, Номер 36(29)

Опубликована: Май 4, 2024

Film formation kinetics significantly impact molecular processability and power conversion efficiency (PCE) of organic solar cells. Here, two ternary random copolymerization polymers are reported, D18─N-p D18─N-m, to modulate the aggregation ability D18 by introducing trifluoromethyl-substituted pyridine unit at para- meta-positions, respectively. The introduction reduces material adjusts interactions with acceptor L8-BO, thereby leading largely changed film earlier phase separation longer times, which enlarge fiber sizes in blend films improve carrier generation transport. As a result, moderate delivers high PCE 18.82% is further improved 19.45% via interface engineering. Despite slightly inferior small area device performances, D18─N-m shows solubility, inspires adjust ratio meta-trifluoromethyl carefully obtain polymer donor D18─N-m-10 good solubility nonhalogenated solvent o-xylene. High PCEs 13.07% 12.43% 1 cm

Язык: Английский

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