A rare case of brominated small molecule acceptors for high-efficiency organic solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Aug. 5, 2023

Abstract Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance excessive crystallinity bromides. To maximize the advantages bromides while circumventing weaknesses, three (CH20, CH21 CH22) are constructed with stepwise brominating on central units rather than conventional end groups, thus enhancing intermolecular packing, dielectric constant them without damaging favorable packing through groups. Consequently, PM6:CH22-based binary organic solar cells render highest efficiency 19.06% for acceptors, more excitingly, a record-breaking 15.70% when further thickening active layers ~500 nm. By exhibiting such acceptor, our work highlights great potential achieving delicately brominating.

Language: Английский

---

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(20)

Published: April 6, 2023

Abstract Developing efficient and stable all‐polymer solar cells (all‐PSCs) has received increasing attention because of their mechanical robustness for flexible devices. Based on the CH‐series small molecule acceptors, a new polymer acceptor (PZC24) is reported obtains decent power conversion efficiency (PCE) 16.82% when blended with PM6. To further improve performance, an oligomeric (CH‐D1), which possesses same backbone structure as PZC24, proposed synthesized third component all‐PSC system. The creative strategy improves crystallinity molecular packing, can maintain charge transport channels all‐PSCs binary Therefore, PM6:PZC24:CH‐D1 based ternary devices exhibit impressive PCE 17.40%, among highest value all‐PSCs. Compared to PM6:PZC24, device exhibits enhanced photosoaking stability thermal stability, simultaneously. In addition, introduction does not weaken As such, display excellent 15.35%. Importantly, this shows universality in PM6:PY‐IT PM6:PY‐V‐γ improved PCEs over 17%. results provide feasible simultaneously photovoltaic herald bright future

Language: Английский

---

Strengthening Near‐Infrared Photon Harvesting in Semi‐Transparent All‐Polymer Solar Cells through the Synergy of Fluorination on the Selenide Monomer Backbone

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)

Published: April 26, 2024

Abstract All‐polymer solar cells (all‐PSCs) offer promising potential for large‐scale manufacturing due to their remarkable mechanical and thermal stability. However, the limited capacity of polymer acceptors near‐infrared (NIR) photon harvesting has impeded progress in semi‐transparent (ST) all‐PSCs. Here, study develops a pair new NIR acceptors, named PYSeF‐T PYSe2F‐T, with mono‐/di‐fluorinated end groups capped selenide monomer backbone, respectively. Owing stronger intermolecular interaction intramolecular charge transfer effect di‐fluorinated PYSe2F‐T exhibits crystallinity more bathochromic absorption 1000 nm. When blended donor, PM6, PY2SeF‐T‐based all‐PSC demonstrates higher efficiency 16.73% short‐circuit current ( J SC ) 27.7 mA cm −2 , which is highest Based on these, ST device based PM6:PYSe2F‐T superior 12.52% an average visible transmittance 26.2% light utilization 3.28%, outperforming mono‐fluorinated counterpart. The work provides in‐depth understanding above synergistic effects develop establishes solid foundation future investigations into large‐area flexible

Language: Английский

---

Selective Chemical Reactivity of Non‐Fullerene Acceptor for Photoelectrochemical Bioassay of Urease Activity

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(46)

Published: July 12, 2023

Abstract Non‐fullerene acceptors (NFAs) are a crucial component of organic photovoltaics, and they have gained significant attention due to their outstanding photoelectric conversion efficiency. However, the recognition reactions specific building blocks in NFAs largely overlooked construction photoelectrochemical (PEC) biosensing platforms. In this study, potential Y6, prototype NFA, is explored construct sensitive PEC biosensor for monitoring urease activity selective chemical reactivity its blocks. The resultant relies on urease‐mediated enzymatic reaction, which produces OH − anions that act as nucleophilic reagent linkage C═C Y6 moiety. This results formation Y6‐OH, exhibits depressive response destroyed conjugated structure intramolecular charge transfer. As expected, linear relationship observed between recession performance concentration urease, with good sensitivity selectivity. Furthermore, detection also successfully realized human saliva samples, suggesting promising NFA‐based biosensors clinical applications even absence common biological units.

Language: Английский

---

Relocating selenium alkyl chain enables efficient all-small molecule organic solar cells

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 482, P. 149149 - 149149

Published: Jan. 28, 2024

Language: Английский

---

Leveraging isomeric effect of third components in D18:Y6 system to 18.51% efficiency

Nano Energy, Journal Year: 2023, Volume and Issue: 118, P. 108991 - 108991

Published: Oct. 12, 2023

Language: Английский

---

Side-Chain Engineering in ITIC Skeleton Enabling As-Cast Organic Solar Cells with Reduced Energy Loss and Improved Vertical Phase Distribution

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(6), P. 2100 - 2110

Published: April 28, 2024

Constructing binary organic solar cells (OSCs) with remarkable open-circuit voltage (VOC) as well suppressed energy loss (ELoss) has been considered a promising strategy for breaking the efficiency bottleneck OSCs. In this work, two novel chlorinated fused-ring electron acceptors were designed and synthesized through side-chain engineering, of which rotation end-capping groups on indenedithiene [3,2-b] thiophene core was effectively restricted. Benefiting from conformation lock, IMC6–4Cl IMC8–4Cl donor/acceptor (D/A) blend films realized more ordered molecular stacking reduced Urbach energy, leading to lower ELoss devices. Moreover, prolonged side chains in inhibited excessive aggregation molecules facilitated better miscibility D18. Therefore, D18:IMC8–4Cl exhibited rational D/A phase separation disorder. Eventually, based devices achieved an exceptional power conversion 13.99% decent VOC 0.97 eV.

Language: Английский

---

Optimizing Branching Linkers in Dimerized Acceptors for Enhanced Efficiency and Stability in Organic Solar Cells

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Most high-performing dimerized acceptors are based on Y-series precursors with superior conjugated π-backbones. The utilization of branch-connected can fully leverage the four end groups to enhance molecular packing, thereby potentially improving both stability organic solar cells (OSCs) while maintaining high power conversion efficiency (PCE). Therefore, optimizing linker is critical realizing their potential in device performance. In this study, three synthesized and conjugation-break linkers branching direction systematically investigate effects different structures properties By introducing an appropriate flexible chain, favorable solubility, morphology achieved, which facilitates charge generation transport suppressing recombination. As a result, OSC dYTAT-C6-F exhibits significantly improved PCE 18.08%, highest among direction. Additionally, demonstrates T80 lifetime 1840 h. These results indicate that conjugation breakages tune aggregation, carrier mobility length further improves these characteristics. findings highlight significant engineering achieve outstanding

Language: Английский

---

O, S, and N Bridged Atoms Screening on 2D Conjugated Central Units of High‐Performance Acceptors

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

Published: May 6, 2025

Abstract Almost all of central cores in high‐performance acceptors are limited to the electron‐withdrawing diimide structure currently, which constrains further acceptor structural innovation greatly. Herein, oxygen (O), sulfur (S), and nitrogen (N) atoms adopted bridge 2D conjugated cores, yielding three platforms CH─O, CH─S, CH─N that differ by only two atoms. Because characteristic atomic outer electron configuration hybrid orbital orientation, O‐, S‐, N‐bridged display quite different conformations electronic properties, namely, dibenzodioxin (planar, non‐aromatic), thianthrene (puckered, non‐aromatic) phenazine aromatic), respectively. A systematic investigation discloses how core, especially its p‐π overlap between lone pair on O/S/N coterminous benzene planes, affect intrinsic photoelectronic properties for first time. Finally, CH─N‐based binary device affords highest fill factor 83.13% organic photovoltaics along with a first‐class efficiency 20.23%. By evaluating strictly controlled molecular comprehensively, work reveals potential uniqueness determining excellent photovoltaic outcomes acceptors.

Language: Английский

---

Molecular modifications in fluorene core for efficient organic photovoltaic cells

Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2023, Volume and Issue: 446, P. 115162 - 115162

Published: Sept. 11, 2023

Language: Английский

---