Flexible Organic Phototransistor Array with Enhanced Responsivity via Metal-Ligand Charge Transfer
Flexible Organic Phototransistor Array with Enhanced Responsivity via Metal-Ligand Charge Transfer
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DOI：
10.1021/acsami.5b11523
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发表时间：
2016-03-23
影响因子：
9.5
通讯作者：
Oh, Joon Hak
中科院分区：
文献类型：
--
作者：
Liu, Xien;Lee, Eun Kwang;Oh, Joon Hak
基于有机光活性材料的光电晶体管结合了从紫外到近红外光谱区域的可调谐光吸收和在柔性衬底上大面积低温加工的能力。然而，由于光活性成分的摩尔消光系数低，它们往往表现出较低的光响应性。本文报道了一种利用钌络合物1 （ru -络合物1）提高有机光电晶体管性能的简单而高效的解决方法。在透明聚酰亚胺（PI）真空衬底上制备了一种空气稳定型N型有机半导体N， ni -双（2-苯基乙基）-苝-3,4:9,10-四羧基二亚胺（BPE-PTCDI）。钌配合物1功能化的BPE-PTCDI光晶体管表现出比原始BPE-PTCDI光晶体管高5000倍的外量子效率（EQE），这是由于金属配体电荷从钌配合物1转移到器件的有源元件（MLCT）。此外，在透明PI衬底上制备了一个大的10 X 10光电晶体管阵列（2.5 X 2.5 cm(2)），显示出明显的光映射。所制备的光电晶体管阵列具有高度的柔性和可扭转性，并且在拉伸和压缩应变下工作良好。我们相信，我们的简单方法将为改善有机半导体的光响应性铺平一条可行的道路，用于可穿戴有机光电器件。
Phototransistors based on organic photoactive materials combine tunable light absorption in the spectral region from Ultraviolet to near-infrared with low-temperature process ability 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,Ni-bis(2-phenyl ethyl)-perylane-3,4:9,10-tetracarboxylic diimide (BPE-PTCDI), has been deposited on a silicon wafer and a transparent polyimide (PI) substrate vacuum. The BPE-PTCDI phototransistors functionalized with Ru-complex 1 exhibit similar to 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 X 10 phototransistor array (2.5 X 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.