Asymmetric chlorination of A₂–A₁–D–A₁–A₂ type non-fullerene acceptors for high-voltage organic photovoltaics

Abstract

Herein, we synthesized the first asymmetric A2-A1-D-A1-A2 type small molecule nonfullerene acceptor (NFA) by chlorination on one side of A1, namely HCl-BTA3. The synergistic effects of asymmetric structure and chlorination...

Enhancing Photovoltaic Performance of Ladder‐Type Heteroarene‐Based Electron Acceptors by Modulating Molecular Packing†

“…In comparison with symmetric counterparts, asymmetric fused‐ring cores can induce large dipole moments in the target NFAs, which is beneficial for reducing the exciton binding energy and improving the molecular packing. [ 32‐33 ] Since 2015, many advanced NFAs with good photovoltaic properties have been reported, in large part due to the tremendous efforts that have been put into the design and synthesis of novel π‐conjugated fused‐ring cores. [ 34‐38 ]…”

The central core size effect in quinoxaline-based non-fullerene acceptors for high VOC organic solar cells

“…[7][8][9][10][11][12][13][14][15][16] However, it is still a challenge to comprehend the relationship between the molecular structure of NFAs and their photovoltaic performance and to achieve a balance among the various parameters influencing the PCE of OSCs. [17][18][19] As one of the most successful NFAs, Y6 possesses a unique banana-like configuration with an A-DA′D-A architecture and achieved a PCE breakthrough of 15.7%. 20 Numerous innovative studies have been conducted to enhance the device performance through structural modifications of Y-series acceptors.…”

“…7–16 However, it is still a challenge to comprehend the relationship between the molecular structure of NFAs and their photovoltaic performance and to achieve a balance among the various parameters influencing the PCE of OSCs. 17–19…”

Two-Dimensional Central Fused Ring Enabled High-Performance Quad-Rotor-Shaped Nonfullerene Acceptor Materials

“…1 Recent research has witnessed the emergence of nonfullerene acceptor materials (NFAs), offering advantages such as enhanced absorption, broader spectral coverage, controllable synthesis, and precise tuning of optoelectronic properties. 2 These advancements have resulted in remarkable performance enhancements for single-junction OSCs, achieving efficiency levels close to 20%. 3−5 One standout group of NFAs is the Y series, 6−9 featuring an A-D-A′-D-A molecular design concept that leverages push− pull effects, similar to those found in ITIC.…”

“…Organic solar cells (OSCs) have gained significant attention as promising renewable energy devices due to their low cost, lightweight nature, and tunable optoelectronic properties . Recent research has witnessed the emergence of nonfullerene acceptor materials (NFAs), offering advantages such as enhanced absorption, broader spectral coverage, controllable synthesis, and precise tuning of optoelectronic properties . These advancements have resulted in remarkable performance enhancements for single-junction OSCs, achieving efficiency levels close to 20%. − …”