Analysis of different O/Ti ratio titanium oxide and its application in Organic Photovoltaics
Date Issued
2012
Date
2012
Author(s)
Shao, Teng-Wei
Abstract
Sol-gel method provide an easy way to modify the characteristics of material. In this study, we synthesis titanium oxide with different O/Ti ratio by sol-gel method but not by reactive sputtering. The characteristics of titanium oxide with different O/Ti atomic ratio is quite different, The band gap change with O/Ti ratio, when increase the O/Ti ratio, the conduction and valence band level more approach to the band position of titanium dioxide. The conduction band level change from 3.92 to 4.32 eV (the conduction band level of titanium dioxide is 4.37 eV), and the valence band level change from 7.73 to 7.60 eV (the valence band level of titanium dioxide is 7.58 eV). By introducing the TiOx into the device, the titanium oxide with the lowest O/Ti ratio is the best for electron transport layer of OPV, we consider that the conduction band level of TiOx approach to the LUMO of electron acceptor, result in a good condition for electron tansport.
On the other hand, the air stability is a serious problems for the development of OPVs. The performance of device without protective layer degraded in the air dramatically. However, by introducing TiOx as a shielding layer, the device will remain high performance even storage in air for a long time.
Subjects
titanium oxide
organic solar cell
SDGs
Type
thesis
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