An n‐Doped Organic Cross‐Linked Electron Transport Layer with High Electrical Conductivity for High‐Efficiency Tandem Organic Photovoltaics DOI Open Access
Yan Xu, Yifan Liao, Wenxuan Wang

et al.

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

Published: March 24, 2025

Abstract With merits of good solution processability, intrinsic flexibility, etc, organic/organic interconnecting layers (ICLs) are highly desirable for tandem organic photovoltaics (OPVs). Herein, an n‐doped cross‐linked electron transport layer (ETL), named c‐NDI‐Br:PEI is developed, via a simple in situ quaternization reaction between bromopentyl‐substituted naphthalene diimide derivative (NDI‐Br) and polyethylenimine (PEI). Due to strong self‐doping, films exhibit high electrical conductivity (0.06 S cm −1 ), which important efficient hole reombination ICL OPVs. In addition, the ETLs show work function modulation ability, solvent‐resistance. The above features enable as ETL not only single‐junction OPVs, but also devices without any metal ICL. Under solar radiation, device with achieves power conversion efficiency (PCE) 18.18%, surpassing ZnO‐based (17.09%). homo‐ hetero‐tandem m‐PEDOT:PSS:c‐NDI‐Br:PEI remarkable PCEs 19.06% 20.06%, respectively. 808 nm laser radiation photon flux 57 mW −2 , homo‐tandem presents superior PCE 38.5%. This study provides new constructing all‐solution‐processed ICL, can be integrated flexible wearable devices.

Language: Английский

Phase Behavior of Conjugated Polymer Solutions and Blends: The Flory–Huggins Lattice Model DOI
Jung Yong Kim

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

Published: Feb. 11, 2025

Language: Английский

Citations

0
Impact of the Torsion Angle in Y6-Backbone Acceptors on the Open-Circuit Voltage in Organic Solar Cells DOI
Yun Wang, Rongkun Zhou, Zilong Zheng

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 3157 - 3164

Published: March 20, 2025

In organic solar cells (OSCs), optimizing the molecular geometry is crucial for improving device efficiency by reducing recombination rates and maximizing charge transfer (CT) state energy. Understanding structure–property relationship regarding geometry, electronic structure, open-circuit voltage (Voc) essential. By employing dynamics simulations density functional theory calculations, we explored how intramolecular torsion angles (θ) between conjugated moieties impact Voc. Small θ promotes orbital energy degeneracy, CT (ECT) its energetic disorder (σCT). While a low ECT can increase non-radiative losses (ΔEnr), small σCT decreases ΔEnr. Balancing these effects essential to maximize value of – ΔEnr high L8-BO exhibits large θ, resulting in 1.17 eV PM6/L8-BO compared 1.04 PM6/Y6, while latter has 0.17 lower Consequently, achieved Voc 0.87 V, surpassing 0.81 V PM6/Y6. These findings were consistent with experimental 0.89 0.84 This study demonstrates role dihedral on OSC material design, as they significantly influence conjugation effect distribution.

Language: Английский

Citations

0
An n‐Doped Organic Cross‐Linked Electron Transport Layer with High Electrical Conductivity for High‐Efficiency Tandem Organic Photovoltaics DOI Open Access
Yan Xu, Yifan Liao, Wenxuan Wang

et al.

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

Published: March 24, 2025

Abstract With merits of good solution processability, intrinsic flexibility, etc, organic/organic interconnecting layers (ICLs) are highly desirable for tandem organic photovoltaics (OPVs). Herein, an n‐doped cross‐linked electron transport layer (ETL), named c‐NDI‐Br:PEI is developed, via a simple in situ quaternization reaction between bromopentyl‐substituted naphthalene diimide derivative (NDI‐Br) and polyethylenimine (PEI). Due to strong self‐doping, films exhibit high electrical conductivity (0.06 S cm −1 ), which important efficient hole reombination ICL OPVs. In addition, the ETLs show work function modulation ability, solvent‐resistance. The above features enable as ETL not only single‐junction OPVs, but also devices without any metal ICL. Under solar radiation, device with achieves power conversion efficiency (PCE) 18.18%, surpassing ZnO‐based (17.09%). homo‐ hetero‐tandem m‐PEDOT:PSS:c‐NDI‐Br:PEI remarkable PCEs 19.06% 20.06%, respectively. 808 nm laser radiation photon flux 57 mW −2 , homo‐tandem presents superior PCE 38.5%. This study provides new constructing all‐solution‐processed ICL, can be integrated flexible wearable devices.

Language: Английский

Citations

0