Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells DOI
Xiaobin Gu, Yanan Wei, Rui Zeng

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Abstract Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non‐radiative recombination (Δ E nr ) that occurs due exciton–vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y‐SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small Δ 0.184 eV, much lower than those Y‐SS Y‐SSe devices with weaker interactions. These achievements not only set record selenium‐containing OSCs, but also mark lowest reported value among high‐performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single‐junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low‐energy‐loss high‐efficiency

Language: Английский

Emergence of Low-Cost and High-Performance Nonfused Ring Electron Acceptors DOI
Pengcheng Jiang, Yahui Liu, Jinsheng Song

et al.

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

ConspectusOrganic solar cells (OSCs) have garnered significant attention in academic and industrial circles due to their advantages such as lightweight, excellent bending performance, the ability be fabricated into semitransparent devices. Since proposal of bulk heterojunction concept by Heeger et al. 1995, conjugated polymer/fullerene pairs gradually emerged optimal choice for active layer materials OSCs. Fullerene derivatives were preferred electron acceptors OSCs because high mobility. However, limitations insufficient light absorption, limited derivative potential, poor energy level tunability, power conversion efficiency (PCE) based on fullerene has encountered a bottleneck approximately 12%, despite continuous updates polymer donor over nearly two decades development, leading gradual decline importance. By contrast, nonfullerene (NFAs) gained dominance this field since first appearing 2015, thanks tunable absorption spectrum, adjustable levels, modifiable chemical structure. Among acceptors, fused-ring (FREAs) ITIC Y6 achieved progress, boosting PCE 20%. This milestone achievement indicates potential commercial applications. synthesis process FREA is complex often constrained low-yield ring-closure reactions, resulting costs.The molecular backbone nonfused ring (NFREAs) composed single bonds, which enables adoption modular mainly via Stille (based organotin reactant) and/or Suzuki organoboron coupling or C–H activation (without prefunctionalization) avoids ring-closing thus making them alternative acceptors. To achieve planar minimize loss conformational rotation, our team innovatively used intramolecular noncovalent interactions replacement traditional covalent bonds. Furthermore, address issues solubility excessive aggregation during film formation NFREAs, we strategically introduced sterically hindered side groups, 2,6-bis(alkyloxy)phenyl diphenylamino, design, effectively mitigating these problems. These innovative design concepts significantly advanced development high-performance NFREAs increasing from research community. The PCEs improved less than 10% close 20% initial discovery. optimizing device fabrication process, 19%, comparable that FREAs. article will delve evolution latest progress aiming provide valuable insights guidance cost-effective NFREA materials.

Language: Английский

Citations

8
Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells DOI
Xiaobin Gu, Yanan Wei, Rui Zeng

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Language: Английский

Citations

6
Effects of non-fused and fused substituents in quinoxaline-based central units on conformation, aggregation, and photovoltaic properties of non-fused ring electron acceptors DOI
Kenta Yamada, Wataru Suzuki,

Motohisa Kubota

et al.

Journal of Materials Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Substituents of the quinoxaline core influence aggregation properties S-shaped acceptors.

Language: Английский

Citations

0
Selective Tuning of Benzothiadiazole Functionality Enables High Crystallinity and Mobility in Regiorandom n-Type Polymers for Organic Field-Effect Transistors DOI Creative Commons
Panagiota Kafourou, Qiao He, Xiantao Hu

et al.

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

Published: March 21, 2025

We report three novel donor-acceptor (D-A) copolymers sharing a common fused donor unit (CDTT) but differing in the functionalization of benzothiadiazole (BT) acceptor unit. Acceptors bearing two cyano groups (DCNBT) are compared to acceptors one and fluorine group (FCNBT) or nitro fluoro (NO2FBT). The choice has significant effect on optoelectronic properties resulting polymers. In organic field-effect transistor (OFET) devices, PCDTT-DCNBT exhibited moderate performance with an electron mobility 0.031 cm2 V-1 s-1, whereas PCDTT-FCNBT demonstrated significantly improved (0.4 s-1). is attributed increased backbone linearity combined more coplanar high thin-film crystallinity. comparison, presence shown have detrimental impact, blue-shifted absorption 0.2 eV increase band gap cyanated Steric effects limit group's π-accepting capability result reduced device performance, 0.024 s-1. This study introduces new BT building block highlights that substituent tuning via effective approach for modulating polymer morphology transport.

Language: Английский

Citations

0
Highly Simplified FeCl3‐Assisted Copolymerization and Doping for Organic Thermoelectrics DOI Open Access

Hyeokjun Kim,

Taek Seong Lee,

Hyung Taek Kim

et al.

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

ABSTRACT The FeCl 3 is a well‐known oxidizing agent for oxidative polymerization as well p‐type dopant making conducting polymers, but no studies have yet explored the simultaneous use of both and doping organic soluble conjugated polymers (CPs) in thermoelectric (OTE) applications. In this study, 4 H ‐cyclopenta[2,1‐ b :3,4‐ ′]dithiophene (CPDT)‐ co ‐3,4‐ethylenedioxythio‐phene (EDOT) were successfully synthesized via simple ‐assisted coupling reaction at room temperature. addition, enabled them to exhibit properties. addition 10% ~ 20% EDOT polymer chain gave synergetic effect on electrical conductivity power factor (PF) OTE devices. that ratio, strong electron‐donating facilitates CPs, planar CPDT backbones stabilize generated polaron/bipolaron species through efficient π‐electron delocalization, resulting highest conductivity. At optimal ratio 20%, more than 10‐fold enhancement PFs was achieved reaching up 0.182 ± 0.021 μ W m −1 K −2 . moiety, except PEDOT:PSS, rarely found copolymers, its proper incorporation expected enhance properties CPs.

Language: Английский

Citations

0
Molecular design for low-cost organic photovoltaic materials DOI

Ni Yang,

Shaoqing Zhang, Yong Cui

et al.

Nature Reviews Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 4, 2025

Language: Английский

Citations

0
Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells DOI
Xiaobin Gu, Yanan Wei, Rui Zeng

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

Abstract Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non‐radiative recombination (Δ E nr ) that occurs due exciton–vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y‐SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small Δ 0.184 eV, much lower than those Y‐SS Y‐SSe devices with weaker interactions. These achievements not only set record selenium‐containing OSCs, but also mark lowest reported value among high‐performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single‐junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low‐energy‐loss high‐efficiency

Language: Английский

Citations

1