The ternary blending strategy is a fundamental approach that is widely recognized in the field of organic optoelectronics. In our investigation, leveraging the inherent advantages of the ternary component blending methodology, we introduced an innovative design for organic photodetectors (OPDs) aimed at reducing the dark current density (Jd) under reverse bias. This pioneering effort involved combining two distinct conjugated molecules (IT-4F and IEICO-4F) with a conjugated polymer (PM7), resulting in a composite material characterized by a well-defined vertical phase separation. To thoroughly explore device performance variations, we utilized a comprehensive array of analytical techniques, including atomic force microscopy (AFM) cross-section methodologies and Kelvin probe force microscopy (KPFM). Through the optimization of the blend ratio (PM7:IT-4F: IEICO-4F at 1:0.8:0.2), we achieved significant advancements. The resulting OPD demonstrated an exceptional reduction in JD, reaching a remarkably low value of 4.95 × 10-10 A cm-2, coupled with an ultra-high detectivity of 4.95 × 1013 Jones and an outstanding linear dynamic range exceeding 100 dB at 780 nm under a bias of -1V. Furthermore, the attained cutoff frequency reached an impressive 220 kHz, highlighting substantial improvements in device performance metrics. Of particular significance is the successful translation of this technological breakthrough into real-world applications, such as in heart rate sensing, underscoring its tangible utility and expanding its potential across various fields. This demonstrates its practical relevance and underscores its versatility in diverse settings.
The high-speed data transmission capability of photomemory is expected to overcome the von Neumann bottleneck, making it a key target for next-generation technological development. With the growing emphasis on environmental sustainability, bio-based materials have attracted increasing attention in recent years due to their rich functional groups, which offer great versatility and application potential. This study employs Ruddlesden-Popper (RP)-phase quasi-2D perovskite (Q-2D PVSK) and bio-based material as the electret layer in non-volatile photomemory, achieving high performance through a simple fabrication process. The results show that the incorporation of bio-based materials leads to devices with high carrier mobility (∼10-2 cm2/V·s), a high Ion/Ioff current ratio (3.19 × 105), and a broad memory window (∼35 V). Moreover, even after multiple cycles, the device maintains a strong photocurrent (∼10-5 A), and long-term retention measurements (∼20,000 s) reveal no significant current degradation. These results validate that the synergistic interaction between bio-based material and Q-2D PVSK significantly enhances both the memory characteristics and the operational stability of the device, demonstrating their strong potential for next-generation nonvolatile photomemory applications.