School of Energy and Chemical Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST) , Ulju-gun, Ulsan 689-798, South Korea.
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, Gyeongbuk 790-784, South Korea.
ACS Appl Mater Interfaces. 2016 Mar 23;8(11):7291-9. doi: 10.1021/acsami.5b11523. Epub 2016 Mar 10.
Phototransistors based on organic photoactive materials combine tunable light absorption in the spectral region from ultraviolet to near-infrared with low-temperature processability over large areas on flexible substrates. However, they often exhibit low photoresponsivity because of low molar extinction coefficient of photoactive components. We report a simple, yet highly efficient solution method for enhancing the performance of organic phototransistors using ruthenium complex 1 (Ru-complex 1). An air-stable n-type organic semiconductor, N,N'-bis(2-phenylethyl)-perylene-3,4:9,10-tetracarboxylic diimide (BPE-PTCDI), has been deposited on a silicon wafer and a transparent polyimide (PI) substrate via thermal evaporation under vacuum. The BPE-PTCDI phototransistors functionalized with Ru-complex 1 exhibit ∼5000 times higher external quantum efficiency (EQE) than that of pristine BPE-PTCDI phototransistors, owing to the metal-ligand charge transfer (MLCT) from Ru-complex 1 to the active component of the device. In addition, a large 10 × 10 phototransistor array (2.5 × 2.5 cm(2)) has been prepared on a transparent PI substrate, showing distinct light mapping. The fabricated phototransistor array is highly flexible and twistable and works well under tensile and compressive strains. We believe that our simple method will pave a viable way for improvements in the photoresponsivity of organic semiconductors for applications in wearable organic optoelectronic devices.
基于有机光活性材料的光电晶体管结合了在从紫外到近红外的光谱区域内可调谐的光吸收以及在柔性衬底上大面积的低温处理能力。然而，由于光活性组件的摩尔消光系数较低，它们通常表现出低的光响应率。我们报告了一种使用钌配合物 1（Ru-complex 1）来提高有机光电晶体管性能的简单而高效的溶液方法。通过真空热蒸发，将空气稳定的 n 型有机半导体 N,N'-双（2-苯乙基）-苝-3,4:9,10-四羧酸二酰亚胺（BPE-PTCDI）沉积在硅晶片和透明聚酰亚胺（PI）衬底上。用 Ru-complex 1 功能化的 BPE-PTCDI 光电晶体管的外部量子效率（EQE）比原始 BPE-PTCDI 光电晶体管高约 5000 倍，这是由于 Ru-complex 1 到器件的活性组件的金属-配体电荷转移（MLCT）。此外，在透明 PI 衬底上制备了一个大的 10×10 光电晶体管阵列（2.5×2.5cm2），显示出明显的光映射。所制造的光电晶体管阵列具有高度的柔韧性和可扭曲性，并且在拉伸和压缩应变下也能很好地工作。我们相信，我们的简单方法将为提高有机半导体在可穿戴有机光电子器件中的光响应率铺平可行的道路。
