Electrochemical synthesis of biomass-derived aromatic N-heterocycles by using Ni-based hierarchical nanosheets catalysts

Journal of Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 116218 - 116218

Published: May 1, 2025

Language: Английский

---

Polymer Conformation and Persistence Length Govern Molecular Weight‐Dependent Photovoltaic Performance in Organic Solar Cells

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 23, 2025

Abstract The molecular weight of conjugated polymers profoundly influences organic solar cell (OSC) efficiency, yet the structural mechanisms driving this relationship remain unresolved. Here, it is demonstrated that polymer conformation, governed by backbone rigidity and persistence length, critical determinant dependent performance in bulk‐heterojunction OSCs. By analyzing benchmark PM6 D18, opposing trends uncovered: achieves peak power conversion efficiency (PCE) 19.11% at low number‐average ( M n ∼51 kDa), 18.47% medium‐ (68 declining to 16.83% high (122 whereas D18 improves from 16.87% (41 kDa) 17.75% (67 19.15% (83 kDa). Neutron scattering computational modeling reveal D18's bulky 2‐butyloctyl side chains impose rotational barriers, stiffening extending its length. This enables high‐ form ordered crystalline domains enhance charge transport. In contrast, PM6's flexible shortens amorphous tie‐chain formation disrupts crystallinity exacerbates recombination. These results establish conformation length as universal descriptors linking microstructure, resolving long‐standing contradictions design.

Language: Английский

---

High‐Molecular‐Weight Polymer Donors Based on Bithiophene Imide for High‐Efficiency and Durable All‐Polymer Solar Cells

Advanced Materials Technologies, Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

Abstract High‐molecular‐weight (high‐MW) polymer semiconductors are pivotal in advancing all‐polymer solar cells (all‐PSCs), known for their excellent device stability and mechanical resilience. However, the development of high‐MW donors ( P D s) faces challenges due to scarcity suitable backbones that ensure both high MW optimal solubility, along with well‐controlled miscibility acceptors A s). Herein, a series bithiophene imide (BTI)‐based s number‐average molecular weights ranging from 120.3 145.5 kDa developed, offering improved aggregation property optimized : miscibility. Notably, PBTI‐OD, featuring 2‐octadecyldodecyl side chain on BTI moiety, exhibited superior blending character morphology s, outperforming its 2‐hexyldecyl 2‐decyltetradecyl analogues (PBTI‐HD PBTI‐DT). As result, PBTI‐OD achieved impressive power conversion efficiencies 18.47% 19.20% binary ternary devices, respectively. Furthermore, progressive enhancement robustness is realized PBTI‐HD PBTI‐DT, enabled by longer alkyl higher MW. These results underscore great potential BTI‐based construct highly efficient durable all‐PSCs, paving way next‐generation energy technologies.

Language: Английский

---

Carbonyl chitosan-induced solar thermal healable and ultratough organohydrogel for dual-mode energy production/storage

Nano Energy, Journal Year: 2024, Volume and Issue: unknown, P. 110536 - 110536

Published: Dec. 1, 2024

Language: Английский

---