研究目的
Investigating the enhancement of small molecule organic photodetector performance for reflectance mode photoplethysmography sensor applications.
研究成果
The study demonstrated a strategy to enhance EQE and reduce the reverse dark current density of vacuum-processed DBP:C60 based OPD devices. The use of HATCN and T2T interlayers significantly improved device performance. The fabricated reflectance-mode PPG sensor showed promising results with high signal strength and low power consumption, indicating potential for commercialization in medical applications.
研究不足
The study focuses on vacuum-processed OPDs, which may have limitations in terms of scalability and cost compared to solution-processed devices. The optimization of interlayer thickness and material composition is crucial for achieving desired performance, which may complicate the fabrication process.
1：Experimental Design and Method Selection:
The study involved the fabrication and optimization of vacuum-processed mixed heterojunction (MHJ) organic photodetectors (OPDs) with low dark current density and high external quantum efficiency (EQE). The effect of donor:acceptor ratio in the active layer and the introduction of interlayers (MoOx, HATCN, and T2T) were investigated.
2：Sample Selection and Data Sources:
The active layer was based on DBP as a donor material and fullerene-C60 as an acceptor material.
3：List of Experimental Equipment and Materials:
Devices were fabricated using thermal evaporation under a pressure of 10–5 Pa. Materials included MoOx, Ir(piq)3, BCP, and LiF.
4：Experimental Procedures and Operational Workflow:
OPDs were fabricated with various interlayers and characterized for their J-V characteristics, EQE, and other performance metrics.
5：Data Analysis Methods:
Performance metrics such as responsivity, dark current density, and specific detectivity were calculated and analyzed.
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