| Summary: | 碩士 === 國立勤益科技大學 === 化工與材料工程系 === 103 === Graphene exhibits two-dimensional special carbon structure and unique electrical, thermal, mechanical properties. Graphene has been demonstrated to be promising for a variety of potential applications, including nanoelectronics, sensors, batteries, and other energy-related devices. Firstly, we prepared graphene oxide by a modified Hummer’s method, and synthesized octylamine functionalized graphene (F-GNS) using long-chain octylamine as the functionalization agent, and hydrazine as reducing agent. We investigated the effect on the photovoltaic performance by incorporating F-GNS. The device structures were (A) ITO/PEDOT:PSS/P3HT:F-GNS: PC71BM/Ca/Al and (B) ITO/PEDOT: PSS/F-GNS/P3HT:PC71BM/Ca/ Al. Secondly, we synthesized oleic acid silver nanoparticles (OA-Ag) by the redox method. The F-GNS and OA-Ag were inserted between HTL and active layer. The device structure was (C) ITO/PEDOT:PSS/F-GNS/OA-Ag/P3HT: PC71BM/Ca/Al. We studied the absorbance, roughness, quenching property, and power conversion efficiency (PCE) of these devices.
When 0.02 weight ratio of F-GNS was blended into the P3HT:PC71BM (1:1 ratio by weight) active layer in the device (A). The roughness of device decreased from 16.60 nm to 9.34 nm, and the increases of short circuit current density and power conversion efficiency were 23 % and 26 %, respectively, when compared to the standard device. When the 0.1 mg/ml F-GNS was inserted between HTL and active layer in the device (B). The roughness of device decreased from 16.60 nm to 5.07 nm, and the increases of short circuit current density and power conversion efficiency were 16 % and 31 %, respectively. We could find that the performance of device was improved by adding functionalized graphene into active layer.
When 0.1 mg/ml F-GNS and 0.025 g/ml OA-Ag were inserted between HTL and active layer in the device (C). The roughness decreased from 16.60 nm to 9.25 nm, and the increases of power conversion efficiency was 28 %. From these results, device (B) exhibits the best photovoltaic performance among these devices.
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