Prof. GENG Yanhou | Publications & Academic Profile | SinoGreenTech

Research Publications & English Decoded Briefs

Showing 3 publications

SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-025-3628-3

Regulating Solution Aggregation and Entanglement for Efficient Self-Powered All-Polymer Photodiodes in Water Quality Monitoring

The solution aggregation structures of conjugated polymers are pivotal in determining their film morphology and optoelectronic properties, yet the relationship between solution aggregation and device performance remains elusive in organic photodiode (OPD) systems. Herein, we introduce the first examination of solution aggregation structures of all-polymer OPD blends, with a focus on how molecular entanglement modulates aggregation behavior and subsequent photodiode performance of low-cost poly(3-pentylthiophene). Using small-angle neutron scattering and freeze-dried imaging, we provide a comprehensive analysis of the solution-state aggregation behavior of poly(3-pentylthiophene) and its evolution in the blend, revealing profound impacts on film morphology and device performance. With finely optimized aggregation, the resulting all-polymer OPD achieves a record-high specific detectivity of ~4×10^13 Jones at zero bias, outperforming all bulk heterojunction (BHJ)-type self-powered OPDs reported to date. This device also demonstrates remarkable thermal stability, with negligible performance degradation after over 800 h of thermal annealing at 85 °C. Furthermore, the self-powered OPD exhibits excellent performance across a broad spectral range, enabling its application in both water quality monitoring and biosensing. This work offers new insights into the solution aggregation behavior of conjugated polymers in OPDs and highlights the importance of resolving solution aggregation in optimizing device function.

Read Full Analysis→Download Authentic PDF

SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3448-1

High work function silver nanowire electrodes via ligand exchange reaction for stretchable organic thin-film transistors

Silver nanowires (AgNWs) are established as promising conductors for stretchable electronics, yet their application in p-type organic thin-film transistors (OTFTs) is constrained by a substantial work function mismatch with the highest occupied molecular orbital (HOMO) of organic semiconductors, resulting in severe charge injection barriers and degraded device performance. This study addresses the bottleneck through a ligand exchange reaction on the AgNW surface using fluorinated molecules, combined with a post-treatment-free fabrication process. The ligand-exchanged AgNW electrodes exhibit a work function exceeding 5 eV, closely aligning with the HOMO level of the p-type polymer semiconductor poly(indacenodithiophene-co-benzothiadiazole) (IDT-BT). Consequently, IDT-BT-based OTFTs incorporating these electrodes demonstrate a reduced threshold voltage and enhanced carrier transport, achieving a hole mobility of 0.4 cm2 V−1 s−1. Critically, the ligand exchange does not compromise mechanical deformability; the devices retain their original mobility after being subjected to 30% strain. These results validate the ligand-exchange strategy as an effective route for work function tuning of AgNW electrodes, enabling high-performance stretchable organic electronics without sacrificing mechanical resilience.

Read Full Analysis→Download Authentic PDF

SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3522-7

Chain Alignment and Film Crystallinity Manipulation Towards High-Performance Large-Area Printed Stretchable Electronics

Scalable printing of stretchable conjugated polymer films is essential for low-cost, large-area wearable electronics, yet achieving optimal film morphology that simultaneously enhances energy dissipation and charge transport remains a critical challenge. This study demonstrates large-area stretchable conjugated polymer films with low crystallinity but strong chain alignment, fabricated by simultaneously regulating fluid field and solidification dynamics during bar-coating. The strong fluid field aligns polymer chains in the coating direction and promotes solution aggregation in the initial wet layer, while sequential rapid solidification restricts crystallization and facilitates aggregate alignment, forming highly-aligned nanofiber networks within the elastomer phase. These elastomer-constrained nanofiber networks maintain connectivity under strain, providing efficient charge transport channels. The resulting films exhibit high charge mobilities of 6.11 and 2.98 cm2 V−1 s−1 at 0% and 100% strains, respectively, among the highest reported for stretchable conjugated polymer films. The films also achieve a high X-ray sensitivity of 1757.2 μC Gyair−1 cm−2 and an ultralow detection limit of 72.5 nGyair s−1, with maintained imaging capability before and after stretching. This work establishes a robust morphology control strategy for high-performance, large-area stretchable conjugated polymer films, advancing their practical application in wearable electronics.

Read Full Analysis→Download Authentic PDF