Performance Enhancement from Hybrid Optoelectronic Devices Comprising Titanium Dioxide Nanorods and Tungsten Oxide Layers

• Main Authors: Tsai, Tsung-Yan, 蔡宗晏
• Other Authors: Yang, Sheng-Hsiung
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/6zgqrt

碩士 === 國立交通大學 === 照明與能源光電研究所 === 105 === The goal of this research is to prepare inverted optoelectronic devices with improved performance by combining titanium dioxide (TiO2) nanorods and tungsten trioxide (WO3) layer. TiO2 nanorods with different lengths were established directly on the fluorine-doped tin oxide (FTO) substrates by the hydrothermal method. The prepared TiO2 nanorods with lengths shorter than 200 nm possess transmittance higher than 80% in the visible range. Inverted light-emitting devices with the configuration of FTO/TiO2 nanorods/Ionic PF/MEH-PPV/PEDOT:PSS/WO3/Au were constructed. The best device based on 100 nm-height TiO2 nanorods achieved a max brightness of 4,493 cd/m2 and current efficiency of 0.66 cd/A, revealing much higher performance compared with those using TiO2 compact layer or nanorods with longer lengths as electron transporting layers. Inverted hybrid polymer solar devices with the configuration of FTO/TiO2 nanorods/Ionic PF/P3HT:PC61BM/PEDOT:PSS/WO3/Au were fabricated, using P3HT:PC61BM as the active layer. The best device performance was obtained by using 600 nm-height TiO2 nanorods and WO3 layer as electron transporting and hole extraction layer, respectively; the open-circuit voltage (VOC), short-circuit current density (JSC), fill factor (FF), and power conversion efficiency (PCE) were 0.56 V, 6.8 mA/cm2, 55%, and 2.08%, respectively. Comparing with devices using TiO2 compact layer and nanoparticles, the devices based on TiO2 nanorods showed higher JSC and PCE values. In this part, the polythiophene derivative containing 1,4-diketopyrrolopyrrole were also used as the active layer for the fabrication of solar devices, and the the corresponding VOC, JSC, FF, and PCE reached 0.56 V, 8.53 mA/cm2, 52%, and 2.48%, respectively. All above results demonstrate the potential of TiO2 nanorods for the application in optoelectronic devices.