ZnO 나노입자의 형상제어에 따른 박막제조 및 역구조 유기태양전지에 관한 연구

Abstract

The effects of zinc oxide (ZnO) preparing process on the performance of inverted organic photovoltaic cells (OPVs) were explored in this research. The morphology and size of ZnO nanoparticles were controlled, leading to more efficient charge collection from device and higher electron mobility compared to nanospheres. Nano-sized ZnO particles were synthesized by using zinc acetate dehydrate and potassium hydroxide in methanol. Also, water was added into the reaction medium in order to control the morphology of ZnO nanocrystals from spherical particles to rods and NH4OH was used to prevent gelation of dispersion. Solution-processed ZnO thin films were deposited onto the ITO/glass substrate by using spin coating process and then ZnO films were used as an electron transport layer applied for inverted organic photovoltaic cells. The analyses were carried out by using TEM, FE-SEM, AFM, DLS, UV-Vis spectroscopy, and current density-voltage characteristics.