高灵敏度溶液处理的有机光电晶体管基于一个散量异质连接,具有持久基作为电子受体
Giulia Baroni1, Francesco Reginato1, Sara Mattiello2
1Institute of Nanostructured Materials (ISMN)-National Research Council (CNR), Via P. Gobetti 101, Bologna 40129, Italy.
概括
研究人员开发了一种新的有机持久基因,用于作为双层有机光电晶体 (OPT) 中的电子受体. 这一突破使得溶液处理器件中高灵敏度和稳定的近红外 (NIR) 光检测成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 摄影探测器是一种光学探测器.
背景情况:
- 双层有机光电晶体管 (OPT) 将电荷传输和光传感分开成不同的层,以优化.
- 当前溶液处理的OPT通常依赖于大量异质连接 (BHJ) 光感应层中的富勒衍生物或非富勒受体.
- 对电子受体的选择有限,限制了这些设备的灵敏度和性能.
研究的目的:
- 研究使用有机持久基作为溶液处理双层OPTBHJ光感应层中的电子受体.
- 探索激素受体结合对设备形态,电荷传输和光敏度的影响.
- 评估OPT的稳定性和性能,利用这种用于近红外 (NIR) 检测的新型受体材料.
主要方法:
- 合成并将一个有机持久基与一个低频段间隙聚合物合在不同的捐赠者:接受者比率.
- 制造的双层OPT结合了捐助者-接受者BHJ光感应层.
- 使用适合BHJ分析的技术,描述了设备形态.
- 在空间电荷有限电流 (SCLC) 范围内进行电荷选择装置测量,以评估电荷传输.
- 在NIR照射下测试设备的性能,测量光敏度和光稳定性.
主要成果:
- 有机基,当作为电子受体在1:3的捐赠者:受体比率使用时,在BHJ内形成了孤立的域.
- 这种形态和激素强大的电子接受性质促进了高效的电子捕获和孔运输.
- 由此产生的OPT显示出对NIR光 (2mW/cm^2) 的高光敏度 (P = 1 × 10^5).
- 持久基呈现出极好的化学和光稳定性,有助于设备的长期运行稳定性.
结论:
- 有机持久基是BHJ光感应层在溶液处理双层OPT中可行的和有效的电子受体.
- 激素受体的独特形态和电子特性使得高性能NIR光检测成为可能.
- 这项工作扩大了有机光电探测器的材料范围,并为高度敏感和稳定的NIR传感器设备提供了一条途径.
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