Fluorine/bromine/selenium multi-heteroatoms substituted dual-asymmetric electron acceptors for o-xylene processed organic solar cells with 19.12% efficiency DOI Creative Commons
Yibo Zhou,

Guangyu Qi,

Han Liu

et al.

Science China Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 15, 2024

Abstract The development of high-performance near-infrared (NIR) absorbing electron acceptors is a major challenge in achieving high short-circuit current density ( J SC ) to increase power conversion efficiency (PCE) organic solar cells (OSCs). Herein, three new multi-heteroatomized Y-series (bi-asy-Y-Br, bi-asy-Y-FBr, and bi-asy-Y-FBrF) were developed by combining dual-asymmetric selenium-fused core brominated end-groups with different numbers fluorine substitutions. With gradually increasing fluorination, exhibit red-shift absorption. Among them, bi-asy-Y-FBrF presents planar molecular geometry, the maximum average electrostatic potential, minimum dipole moment, which are conducive intramolecular packing charge transport. Moreover, D18:bi-asy-Y-FBrF active layer higher crystallinity, more suitable phase separation, reduced recombination compared D18:bi-asy-Y-Br D18:bi-asy-Y-FBr blends. Consequently, among theses binary OSCs, device achieves PCE 15.74% an enhanced 26.28 mA cm −2 , while obtains moderate 15.04% highest open-circuit voltage V OC 0.926 V. Inspired its complementary absorption NIR-absorbing BTP-eC9 as acceptor, bi-asy-Y-Br introduced into D18:BTP-eC9 construct ternary further boosted 19.12%, top values for reported green solvent processed OSCs.

Language: Английский

Transport Resistance Dominates the Fill Factor Losses in Record Organic Solar Cells DOI Creative Commons

Chen Wang,

Roderick C. I. MacKenzie, Uli Würfel

et al.

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

Published: March 5, 2025

Abstract Organic photovoltaics (OPV) are a promising solar cell technology well‐suited to mass production using roll‐to‐roll processes. The efficiency of lab‐scale cells has exceeded 20% and considerable attention is currently being given understanding minimizing the remaining loss mechanisms preventing higher efficiencies. While recent improvements partly owed reducing non‐radiative recombination losses at open circuit, low fill factor ( FF ) due significant transport resistance becoming Achilles heel OPV. term refers voltage light intensity‐dependent charge collection in low‐mobility materials. In this perspective, it demonstrated that even highest organic (OSCs) reported to‐date have performance can be attributed lead high losses. A closer look material properties influencing provided. How experimentally characterize quantify described by providing easy follow instructions. Furthermore, causes theory behind detailed. particular, relevant figures merit (FoMs) different viewpoints on integrated. Finally, we outline strategies followed minimize these future cells.

Language: Английский

Citations

1
MOF Nanosheet Enable Accelerated Redox Kinetics and Ultralow Overpotential for Light‐Assisted Li‐CO2 Battery DOI Open Access

Xiaojing Lin,

Ziyuan Wu, Cong Xu

et al.

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

Published: Jan. 31, 2025

Lithium-carbon dioxide (Li-CO₂) batteries have attracted much attention due to their high energy density, low cost, and carbon sequestration. However, the sluggish conversion kinetics between CO₂ discharge product lithium carbonate (Li₂CO₃) hindered practical applications. Herein, a flower-like photosensitive metal-organic framework (FJU-115-NS) has been employed as cathodic electrocatalyst for Li-CO₂ batteries. The FJU-115-NS with well-ordered micropores abundant exposed catalytic sites can effectively facilitate ion transport catalyze Li₂CO₃ formation/decomposition, leading improved battery performance. At current density of 200 mA g⁻¹, exhibits substantial capacity 31579.34 h overpotential 1.31 V, stable operation over 3200 h. Importantly, under light irradiation, charging voltage significantly dropped from 4.45 V (without light) 3.43 at 2 A g⁻¹. Additionally, cell demonstrated an exceptionally just 0.45 highlighting its enhanced efficiency light-assisted conditions. This work provides valuable guidance developing MOF catalysts upgrade longevity

Language: Английский

Citations

0
In-situ volatilization of solid additive assists as-cast organic solar cells with over 20 % efficiency DOI
Peng Mao, Baoquan Zhang, Heng Zhang

et al.

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 165, P. 101022 - 101022

Published: May 27, 2025

Language: Английский

Citations

0
Fluorine/bromine/selenium multi-heteroatoms substituted dual-asymmetric electron acceptors for o-xylene processed organic solar cells with 19.12% efficiency DOI Creative Commons
Yibo Zhou,

Guangyu Qi,

Han Liu

et al.

Science China Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 15, 2024

Abstract The development of high-performance near-infrared (NIR) absorbing electron acceptors is a major challenge in achieving high short-circuit current density ( J SC ) to increase power conversion efficiency (PCE) organic solar cells (OSCs). Herein, three new multi-heteroatomized Y-series (bi-asy-Y-Br, bi-asy-Y-FBr, and bi-asy-Y-FBrF) were developed by combining dual-asymmetric selenium-fused core brominated end-groups with different numbers fluorine substitutions. With gradually increasing fluorination, exhibit red-shift absorption. Among them, bi-asy-Y-FBrF presents planar molecular geometry, the maximum average electrostatic potential, minimum dipole moment, which are conducive intramolecular packing charge transport. Moreover, D18:bi-asy-Y-FBrF active layer higher crystallinity, more suitable phase separation, reduced recombination compared D18:bi-asy-Y-Br D18:bi-asy-Y-FBr blends. Consequently, among theses binary OSCs, device achieves PCE 15.74% an enhanced 26.28 mA cm −2 , while obtains moderate 15.04% highest open-circuit voltage V OC 0.926 V. Inspired its complementary absorption NIR-absorbing BTP-eC9 as acceptor, bi-asy-Y-Br introduced into D18:BTP-eC9 construct ternary further boosted 19.12%, top values for reported green solvent processed OSCs.

Language: Английский

Citations

3