Photoresponse of Physically Oxidized Graphene Sensitized by an Organic Dye

• DOI: 10.1021/acs.jpcc.7b00712
• Publication Date: 2017-03-23T05:55:51Z
• Authors: Jaehun Han; Youngbin Lee; S. Appalakondaiah; Jinshu Li; Xing Gao; Youngjae Yoo; Dongmok Whang; Euyheon Hwang; Jeong Ho Cho
• Keywords: Oxidizing agent

We investigated the charge transport and photoresponse characteristics of a hybrid structure comprising physically oxidized graphene Rhodamine-based organic dye molecules. The oxidation surface was deterministically controlled by varying UV/ozone exposure time. then modified with molecules using simple dip-coating method. electrical conductance resulting films were systematically Raman spectroscopy environment-dependent measurements. oxygen-containing groups generated dramatically enhanced photoresponses while maintaining high device performance. Importantly, we found that strongly related to chemical reactions between photoexcited electrons adsorbates (water or oxygen) in layer as well migration toward top due negatively charged at graphene–dye interface. Our effective method involving oxidizing hybridizing resultant dyes will inspire new approaches development electronics optoelectronics based on graphene.