POS5-0831
In-situ Clear Detection Under Reverse Bias via Noise Floor Suppression in Nano-Modulated Ternary Blend Organic Photodetectors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Jihyun Lim (Chung-Ang University)
Co-Author(s)
Abstract
Organic photodetectors (OPDs) based on organic semiconductors are attracting attention as next-generation owing to their lightweight nature, mechanical flexibility, solution processability, and tunable optoelectronic properties. In particular, non-fullerene acceptors, together with PM6 donor polymers, enable progress in organic optoelectronic devices through strong absorption, suitable energy-level alignment, and efficient charge transport. In this study, a BTP-eC9-based ternary bulk heterojunction (BHJ) strategy is presented for high-performance and bias-stable OPDs. Incorporating BTP-eC9 into a PM6:BTP-4F-12 BHJ system regulates nanoscale molecular arrangement and the energy-level, resulting in suppressed leakage current and improved stability under reverse bias. The optimized BTP-eC9 ternary BHJ OPD exhibits stable dark-current suppression while maintaining reliable photoresponse and achieves a specific detectivity of 2.11 × 10¹² Jones at −2 V. Real-time dark-current monitoring confirms enhanced current stability and noise suppression compared with the binary OPD. Moreover, the device maintains clear photoplethysmography signals even under bias variation, demonstrating its potential for wearable optical sensing. To further reduce dark current, a BTP-eC9 single-material layer is introduced onto the ternary BHJ active layer through a dry lamination process. This dry-laminated BTP-eC9 interfacial layer acts as an additional noise-blocking layer by reducing unfavorable charge injection and leakage pathways, thereby enhancing dark-current suppression. The dry lamination approach enables interfacial engineering without damaging the underlying BHJ morphology, suggesting its applicability to data communication and flexible organic optoelectronic devices. These results demonstrate that combining ternary BHJ molecular engineering with deposition acceptor interfacial lamination is a promising strategy for low-noise, flexible, and bias-stable OPDs.
