High Performance of Organic/ZnO-nanorod Hybrid Solar Cells Assisted by Conductive Small Molecules
Date Issued
2012
Date
2012
Author(s)
Chen, Jian-Yu
Abstract
Interface property is one of the important issues in optimizing the performance of hybrid polymer/metal-oxide solar cells. We select a soluble conductive small molecule, 2-naphthalenethiol (2-NT), to modulate the surface property of the oriented ZnO-nanorod arrays before contacting with the polymer blend in an inverted hybrid solar cell configuration. This conductive molecule enhances the compatibility between polymer blend and metal-oxide; enlarges the exciton separation efficiency and subsequent charge transfer rate into the bulk of nanorods by the bond dipole field; improves the ordering of charge transport network. As a result, there is a substantial improvement in photocurrent, open circuit voltage, and fill factor leading to double the power conversion efficiency of the unmodified device from 1.86% to 3.71%. This value sets the record of the highest efficiency reported to date based on ITO/ZnO-nanorod/poly(3-hexythiophene):(6,6)-phenyl C61 butyric acid methyl ester (P3HT:PCBM)/Ag configuration.
Subjects
organic/inorganic hybrid solar cells
surface modification
conductive molecule
ZnO-nanorods
interfacial dipoles
Type
thesis
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