Preparation of Fluorinated Graphene Nanosheets for Polymer Photovoltaic Devices

• Main Authors: Lin, Wai-Chen, 林渭澄
• Other Authors: Chen, Fang-Chung
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/35475q

碩士 === 國立交通大學 === 平面顯示技術碩士學位學程 === 103 === In this study, we describe the preparation of fluorinated graphene nanosheets (FGS) through photoexfoliation from fluorinated graphite (FG) in liquid phase. We discovered that the use of UV radiation upon the FG dispersion in N-methyl-2-pyrolidone could facilitate the exfoliation of FGS. From the analysis of the images obtained from transmission electron microscopy and atomic force microscopy, the average thickness of the FGSs was ca. 3 nm, which was thinner than that of the nanosheets prepared using conventional sonication approach. Furthermore, the FGS can be uniformly deposited on the substrates by spin coating and behaved as an effective electron transport layer of polymer solar cells (PSCs). The as-prepared inverted PSC exhibited an open circuit voltage of 0.53 V, a short circuit current density of 10.22 mA cm-2 and a fill factor up to 53.7%., resulting in a power conversion efficiency (PCE) of 2.91%. The PCE of the PSC containing FGS prepared through sonication was 1.73%. The lower efficiency was probably due to the higher contact resistances, which may be originated from the higher thickness of the FGS.