Influence of PEDOT：PSS buffer layer on the performance of organic photocoupler

• Published in: Optoelectronics letters Vol. 5; no. 3; pp. 173 - 176
• Main Author: 王忠强 吴晓明 荆娜 侯庆传 胡子阳 程晓曼 华玉林 魏军 印寿根
• Format: Journal Article
• Language: English
• Published: Heidelberg Tianjin University of Technology 01.05.2009
• Subjects: Lasers; OLED显示器; Optical Devices; Optics; PEDOT; Photonics; Physics; Physics and Astronomy; 性能; 时间响应特性; 有机发光二极管; 缓冲层; 藻酸双酯钠; 输出电流; High Occupied Molecular Orbital; Active Layer; Input Current; Output Current; Buffer Layer
• ISSN: 1673-1905; 1993-5013
• DOI: 10.1007/s11801-009-9031-9

We have fabricated an organic photocoupler with organic light-emitting diodes （OLEDs） with 520 nm emissive wavelength as the input light source and a photodiode （PD） based on poly（3-hexylthiophene） （P3HT）：1-（3-methoxycarbonyl）propyl- 1-phenyl-（6,6）-C61 （PCBM） as the detector. The influences of buffer layer （PEDOT：PSS） on output current （Iout）, current transfer ratio （CTR） and time response characteristics of the photocoupler device were studied. Through our experiments, It is found that the output current linearly increases with the input current, the max output current and CTR of the devices with PEDOT：PSS buffer layer are 2 times and 7 times than that of the devices without buffer layer respectively, which show that the existence of buffer layer can enhance the output photocurrent efficiently. Moreover, the existence of PEDOT：PSS eliminates the time delay of the devices.