Synthesis of Highly Concentrated ZnO Nanorod Sol by Sol-gel Method and their Applications for Inverted Organic Solar Cells

摘要

The effects of the zinc oxide (ZnO) preparing process on the performance of inverted organic photovoltaiccells (OPVs) were explored. The morphology and size of ZnO nanoparticles were controlled, leading to more efficientcharge collection from device and higher electron mobility compared with nanospheres. Nanosized ZnO particles weresynthesized by using zinc acetate dihydrate and potassium hydroxide in methanol. Also, water was added into the reactionmedium to control the morphology of ZnO nanocrystals from spherical particles to rods, and NH4OH was used toprevent the gelation of dispersion. Solution-processed ZnO thin films were deposited onto the ITO/glass substrate byusing spin coating process and then ZnO films were used as an electron transport layer in inverted organic photovoltaiccells. The analyses were carried out by using TEM, FE-SEM, AFM, DLS, UV-Vis spectroscopy, current density-voltagecharacteristics and solar simulator.