Achieving a Near-Infrared Absorption by A−DA’D−A Type Isoindigo-Based Small Molecular Acceptors for Organic Photovoltaics

Molecules, Journal Year: 2025, Volume and Issue: 30(2), P. 344 - 344

Published: Jan. 16, 2025

Isoindigo (IID)-based non-fullerene acceptors, known for their broad absorption spectra and high charge carrier mobilities, play a crucial role in organic photovoltaics. In this study, two A-DA'D-A type unfused ring acceptors (URAs), IDC8CP-IC IDC6CP-IC, were designed synthesized using cyclopentadithiophene (CPDT) IID core units, each functionalized with different alkyl chains (2-hexyldecyl 2-octyldodecyl), through an atom- step-efficient direct C-H arylation (DACH) method. Both URAs, despite the absence of non-covalent conformation locking between CPDT IID, demonstrated favorable molecular planarity, ranges, low band gaps, molar coefficients. Notably, IDC6CP-IC exhibited stronger intermolecular transfer J-aggregation. An solar cell (OSC) device based on achieved power conversion efficiency (PCE) 3.10%, photoresponse range extending from 400 to 900 nm. This study highlights significant impact chain engineering material synthesis, photoelectric properties, corresponding performance. Furthermore, DACH is shown be promising approach synthesizing IID-based URAs near-infrared (NIR) absorption, making it excellent candidate bulk heterojunction (BHJ) OSC applications.

Language: Английский

Minimizing Thermally Activated Carrier Generation for Ultra-Low Dark Current Density and Enhanced Thermal Stability in Air-Stable All-Polymer Photodetectors

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

Published: April 8, 2025

Language: Английский