Enhancing Dynamic Range in Low-Noise 2D-Integrated Organic Photodiodes by Mitigating Langevin Recombination

Organic photodiodes (OPDs) are a significant focus for the next-generation of light-detection technologies. However, organic semiconductors in OPDs still face key challenges, such as low carrier mobilities and limited efficiency in generating photon-induced signals, which affect the detectable resolution and dynamic range. In this study, the characterization of the interaction between organic polymeric bulk heterojunctions and two-dimensional (2D) transition metal dichalcogenides (MoS₂) reveals an enhancement in photocurrent due to improved photogeneration dynamics (e.g., reduction of bimolecular recombination and enhancing charge carrier transfer). Consequently, the optimized 2D MoS₂-additive OPD achieved an exceptionally high linear dynamic range (LDR) exceeding 174 dB and an outstanding specific detectivity (D*) of 3.21 × 10¹² Jones, while reaching femto-scale noise levels. This presents the potential of state-of-the-art OPDs for various light signal applications.