Shell Composition-Mediated Band Alignment and Defect Engineering in Indium Phosphide-Based Core/Shell Quantum Dots

The Journal of Physical Chemistry C, Год журнала: 2025, Номер unknown

Опубликована: Март 28, 2025

Realization of a suitable energy band structure core–shell-structured indium phosphide (InP)-based quantum dots (QDs) is crucial for their anticipated use in various optoelectronic devices. In this study, we demonstrate how to achieve the optimal alignment and defect engineering InP core/Zn1–xCdxSe shell QDs by systematically varying composition. Using advanced spectroscopic techniques, show alloyed Zn1–xCdxSe reduces surface defects while simultaneously tuning charge carrier wave functions from localization delocalization mode due shift type-I quasi-type-II. These InP-based core/shell also exhibit outstanding stability under high-energy ultraviolet irradiation thermal treatment, as well long-term storage stability, which essential device applications. Furthermore, studies using floating gate transistors based on synergistic influence injection spontaneous recovery trapped charges.

Язык: Английский

---

End-Group Modulation in a High Electron Mobility Y-Series Nonfullerene Acceptor Achieved Based on the DFT Method

ACS Omega, Год журнала: 2025, Номер unknown

Опубликована: Апрель 13, 2025

The joining of Y6 has effectively promoted the power conversion efficiency (PCE) organic solar cells, and impact its end-group modification on PCE is significant. Here, eight different groups are introduced to modify Y6, forming acceptors named V1, V2, V3, V4, V5, V6, V7, R. excited states, light absorption properties, intermolecular electron transfer discussed by density functional theory. state, average local ionization energy, Hirshfeld population, potential, affinity, mobility also calculated. Results show that V7 obtains largest red-shift in UV-visible spectra (787.55 nm). V5 have better electronic coupling while exhibiting leading (0.9577 0.4383 cm2 V-1 s-1). Acceptors with rigid skeletons, good planarity, minimal steric hindrance, locally uniform ALIE distributions potential achieve higher mobility. These results indicate precise engineering can regulate acceptors, thereby increasing PCE.

Язык: Английский

---

Rational halogenation on aromatic-core of tethered small molecule acceptors for high-performance polymer solar cells

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 162657 - 162657

Опубликована: Апрель 1, 2025

Язык: Английский

---

Central π-conjugated extension in quinoxaline-based small-molecule acceptors as guest components enabling high-performance ternary organic solar cells

Journal of Materials Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Ternary strategies have critical roles in pursuing high efficiencies for organic solar cells (OSCs).

Язык: Английский

---

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

---

Cyanobenzene‐Modified Quinoxaline‐Based Acceptors with Optimal Excitonic Behavior Enable Efficient Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 22, 2025

Abstract Cyanogroup (‐CN) is a strongly electron‐withdrawing and highly polar functional group; therefore, cyanation has been extensively utilized to optimize the terminal groups of high‐performance small‐molecule acceptors (SMAs) in organic solar cells (OSCs). Herein, by regulating cyanobenzene substitution central core for first time, four novel SMAs are synthesized, named phCN‐F, phCN‐Cl, 2phCN‐F, 2phCN‐Cl. Theoretical experimental analyses have shown that asymmetric symmetric cyanobenzene‐substitution core, coupled with selective groups, can significantly affect intrinsic excitonic properties molecule. Blends based on molecules possess tighter molecular packing more suitable phase separation facilitate exciton dissociation, charge transport, extraction. The optimal device performance phCN‐F‐based OSC reaches 20.16%, which higher than symmetrically substituted OSCs. Furthermore, devices prepared phCN‐F maintain over 90% their initial efficiency after being heated at 85°C 3000 h, demonstrating excellent thermal stability. This study elucidates potential mechanisms optimizing through providing valuable insights further design record‐breaking SMAs.

Язык: Английский

---

Selenization Strategy of Phenazine‐based Non‐Fullerene Acceptors Promotes Photon Harvesting and Reduces Voltage Loss in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 26, 2024

Abstract Phenazine‐based small molecular acceptors (SMAs), which benefit from the reduced energy loss ( E ), have emerged as promising candidates for achieving high‐efficiency organic solar cells (OSCs). Nevertheless, potential advancements of phenazine‐based photovoltaic devices are hindered by constrained short‐circuit current J sc ). Though incorporation selenium (Se) atoms has been proven effective in enhancing , it simultaneously introduces disorder stacking and charge recombination. Based on desire to harness full phenazine structure benefits Se substitution, a series Se‐substituted SMAs, namely PzIC‐SSe‐4F PzIC‐SeSe‐4F meticulously synthesized. Due increased photon harvesting capabilities, device using demonstrated significantly 27.73 mA cm −2 . Remarkably, PzIC‐SeSe‐4F‐based displayed an astonishing open circuit voltage V oc ) 0.873 V, representing highest recorded among all reported symmetric Y‐series SMAs‐based devices. Thanks synergistic effect central cores PM6:PzIC‐SeSe‐4F‐based achieves power conversion efficiency (PCE) 17.69%. The findings serve pivotal reference further development

Язык: Английский

---

Bithieno[3,4‐c]pyrrole‐4,6‐dione‐Based Wide‐Bandgap Donor Polymers for Efficient Polymer Solar Cells

Macromolecular Rapid Communications, Год журнала: 2024, Номер unknown

Опубликована: Авг. 6, 2024

Abstract The polymer solar cells (PSCs) have garnered substantial interest owing to their lightweight, cost‐effectiveness, and flexibility, making them ideal for large‐scale roll‐to‐roll manufacturing. In this study, two wide‐bandgap (WBG) donor polymers, PFBiTPD PClBiTPD, utilizing bithieno[3,4‐c]pyrrole‐4,6‐dione (BiTPD) as the electron‐accepting unit fluorinated/chlorinated benzo[1,2‐b:4,5‐b']dithiophene (BDT) electron‐donating moiety are designed synthesized. polymers demonstrated large optical bandgaps (exceeding 1.80 eV) blended with ITIC‐4F form active layers in PSCs. PFBiTPD‐based devices showed a well‐dispersed fibrillar network, facilitating efficient charge generation transport. Thus, these attained power conversion efficiency (PCE) of 8.60%, featuring fill factor (FF) 62.89%, an open‐circuit voltage ( V oc ) 0.88 short‐circuit current density J sc 15.54 mA cm −2 . contrast, PClBiTPD‐based displayed lower performance due less favorable morphology. study underscores importance design morphology control optimizing photovoltaic

Язык: Английский

---

Systematic anode engineering enabling universal efficiency improvements in organic solar cells

Giant, Год журнала: 2024, Номер 20, С. 100338 - 100338

Опубликована: Авг. 30, 2024

Anode modification and optimization is crucial towards improving performance of organic solar cells (OSCs). PEDOT:PSS the most common choice as a hole transport layer (HTL) material, but suffers from issues including low conductivity. In this work, three alkyl amine derivatives - methylamine hydrochloride (MA), ethylamine (EA) propylamine (PA) are doped into commercially available Al 4083 to form PEDOT:PSS-MA, PEDOT:PSS-EA PEDOT:PSS-PA, modified HTLs. All these HTLs exhibit improved chemical electrical properties work functions (WF), conductivities charge carrier motilities. The doping shows compatibility in both Small Molecular Acceptors All-Polymer OSCs. With PEDOT:PSS-MA demonstrates highest PCE 18.49 % compared 17.84 OSC devices prepared with pristine PM6:L8-BO system, while PM6:PY-IT all-polymer OSCs improve 14.53 15.22 %. AFM characterizations reveal that introduction dopants have smoothened surface morphology spin-coated HTL films, which contributes more efficient extraction. summary, study not only presents method efficiencies, also provides insight further possible directions anode

Язык: Английский

---

Dipole Moment Modulation of Terminal Groups Enables Asymmetric Acceptors Featuring Medium Bandgap for Efficient and Stable Ternary Organic Solar Cells

Angewandte Chemie, Год журнала: 2024, Номер 137(3)

Опубликована: Сен. 9, 2024

Abstract This study puts forth a novel terminal group design to develop medium‐band gap Y‐series acceptors beyond conventional side‐chain engineering. We focused on the strategical integration of an electron‐donating methoxy and electron‐withdrawing halogen atom at benzene‐fused groups. combination precisely modulated dipole moment electron density groups, effectively attenuating intramolecular charge transfer effect, widening band acceptors. The incorporation these groups yielded two asymmetric acceptors, named BTP‐2FClO BTP‐2FBrO, both which exhibited open‐circuit voltage ( V oc ) as high 0.96 in binary devices, representing highest OC s among small molecule More importantly, BTP‐2FBrO exhibit modest aggregation behaviors molecular crystallinity, making them suitable third component mitigate excess PM6 : BTP‐eC9 blend optimize devices’ morphology. As result, optimized BTP‐2FClO‐based ternary organic solar cells (OSCs) achieved remarkable power conversion efficiency (PCE) 19.34 %, positioning it highest‐performing OSCs. Our highlights importance manipulating moments developing offers highly efficient for high‐performance

Язык: Английский

---