In the past few years, we have fabricated nanoscale La0.7Sr0.3MnO3 periodic arrays with unique optical and magnetic
properties successfully. These periodic patterns were made by La0.7Sr0.3MnO3 resist that can be developed under a
nontoxic and environmental friendly manner using pure water. The resist is also capable to exhibit both positive and
negative resist behaviors depending on the electron beam dosage. Thus, these special characteristics are used to fabricate
and tune periodic structure thin film having controlled optical reflectance properties in the wavelength of 300 nm to 800
nm with one fixed design electron beam pattern by simply changing the electron beam dosage only. Additionally, the
magnetization of La0.7Sr0.3MnO3 patterns can be enhanced by post sintering the sample at 900 °C after electron beam
irradiation. Therefore, our study provides a one-step, simple, and convenient alternative technique for the fabrication of
tunable optical structure and nanoscale magnetic patterns, which form the building blocks for the study of optoelectronic
and magnetic devices in nanoscale periodic arrays.
The solution processable poly(3-hexylthiophene)(P3HT)/TiO2-nanorod hybrid material for solar cells has been
successfully demonstrated. A critical issue for using hybrid heterojunction concept is the interface properties which
affect the exciton separation efficiency and bi-carrier transport. To improve the interface properties, we replace the
insulating surfactant on TiO2 nanorod surface with a more conductive oligomer, carboxylate terminated 3-hexylthiophene (P3HT-COOH). The enhancement of exciton separation efficiency due to better organic-inorganic
interfacial compatibility can be obtained. The electron mobility for transporting in the TiO2 network is improved. A
power conversion efficiency has been increased 3 times by using this new hybrid material without optimization as
compared with the hybrid without P3HT-COOH modification.
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