20.64% Efficient and Stable Binary Organic Solar Cells via Thermodynamic-Engineered Interlayer Diffusion and Exciton Generation.

Despite thermodynamics playing a central role in active-layer optimization, unresolved temperature-dependent mechanisms hinder further efficiency improvements in organic solar cell. Herein, real-time thermal imaging is employed to unravel the temperature-controlled assembly dynamics during sequential processing (SqP) of active-layer films on a hot-substrate (HS). The HS process provides higher temperature and prolonged heating time for the active layer during SqP compared to the widely adopted hot-solution technique, enabling accelerated liquid-phase reorganization and nucleation in the bottom layer.

Dual-Channel Förster Resonance Energy Transfer Boosting Exciton Utilization Efficiency for High-Performance Layer-by-Layer Processed All-Small-Molecule Organic Solar Cells.

All-small-molecule organic solar cells (ASM-OSCs) hold great potential for commercialization owing to their well-defined molecular structures and minimal batch-to-batch variations. Nevertheless, the inherent challenges in precise control of blend morphology of the active layer restrict exciton utilization efficiency, resulting in the restricted power conversion efficiencies (PCEs) in ASM-OSC compared with polymer-based OSCs. Herein, small molecule donor Por-BR is incorporated into the acceptor layer of the DAPor-DPP/6TIC system utilizing a layer-by-layer (LbL) deposition strategy to construct high-performance ASM-OSCs.

Achieving 20% Toluene-Processed Binary Organic Solar Cells via Secondary Regulation of Donor Aggregation in Sequential Processing.

Sequential processing (SqP) of the active layer offers independent optimization of the donor and acceptor with more targeted solvent design, which is considered the most promising strategy for achieving efficient organic solar cells (OSCs). In the SqP method, the favorable interpenetrating network seriously depends on the fine control of the bottom layer swelling. However, the choice of solvent(s) for both the donor and acceptor have been mostly based on a trial-and-error manner.

Extending Exciton Diffusion Length via an Organic-Metal Platinum Complex Additive for High-Performance Thick-Film Organic Solar Cells.

The long exciton diffusion length (L) plays an important role in promoting exciton dissociation, suppressing charge recombination, and improving the charge transport process, thereby improving the performance of organic solar cells (OSCs), especially in thick-film OSCs. However, the limited L hinders further improvement in device performance as the film thickness increases. Here, an organic-metal platinum complex, namely TTz-Pt, is synthesized and served as a solid additive into the D18-Cl:L8-BO system.

Isomerization-Controlled Aggregation in Photoactive Layer: An Additive Strategy for Organic Solar Cells with Over 19.5 % Efficiency.

Morphology control of the photoactive layer is crucial for achieving high-performance organic solar cells (OSCs), yet it remains a significant challenge in this field. One effective approach is the additive strategy, which fine-tunes the morphology of the photoactive layer. However, the underlying mechanisms governing the impact of different types of additives from liquid, solid, to volatile solid, on the bulk heterojunction morphology and device performance are not fully understood.

[A spatial-temporal hybrid feature extraction method for rapid serial visual presentation of electroencephalogram signals].

Rapid serial visual presentation-brain computer interface (RSVP-BCI) is the most popular technology in the early discover task based on human brain. This algorithm can obtain the rapid perception of the environment by human brain. Decoding brain state based on single-trial of multichannel electroencephalogram (EEG) recording remains a challenge due to the low signal-to-noise ratio (SNR) and nonstationary.