# Polymer Tandem Solar Cell Having $TiO_2$ Nanoparticle Interlayer

• Chung, Won-Suk (Materials Science and Technology Division Solar cell Research Center, Korea Institute of Science and Technology (KIST)) ;
• Lee, Hyun-Jung (Materials Science and Technology Division Solar cell Research Center, Korea Institute of Science and Technology (KIST)) ;
• Lee, Won-Mok (Department of Chemistry, Sejong University) ;
• Ko, Min-Jae (Materials Science and Technology Division Solar cell Research Center, Korea Institute of Science and Technology (KIST)) ;
• Park, Nam-Gyu (Materials Science and Technology Division Solar cell Research Center, Korea Institute of Science and Technology (KIST)) ;
• Ju, Byeong-Kwon (Display and Nanosystem Lab, College of Engineering, Korea University) ;
• Kim, Kyung-Kon (Materials Science and Technology Division Solar cell Research Center, Korea Institute of Science and Technology (KIST))
• Published : 2009.10.12

#### Abstract

A solution processed polymer tandem cell has been fabricated by using the organic layer coated crystalline $TiO_2$ nanoparticle inter layer. The highly dispersive OL-$TiO_2$ has several advantages in terms of excellent film forming property, crystallinity, optical transparency, and well defined chemical composition. The surface morphology of the $TiO_2$ thin film was found to play a crucial role in the performance of the polymer tandem cell. The stability of the tandem cell, utilizing dense $TiO_2$ nanoparticles inter layer, was superior to the stability of the single junction cell.