THESIS
2015
xiv, 157, 233, that is, xiv, 154, 212 pages : illustrations ; 30 cm
Abstract
In this study, the effects of particle size, crystal phase and morphology on the overall solar
cell performance were examined. It was found that the TiO
2 nanoparticle film with smaller
particles ~10 nm in diameter resulted in a lower light-to-electricity conversion efficiency than
larger particles with diameter of ~25 nm. Photoanode coated with larger particles had higher
light harvesting efficiency due to better light scattering ability. Rutile and anatase are the most
common forms of TiO
2 but anatase based DSSCs showed better photovoltaic performance.
Electrochemical impedance spectroscopy (EIS) studies also revealed that the electron lifetime
was longer and the charge transport was faster in anatase films. Meanwhile, a new
photoanode material rutile nanobundle had been synthe...[
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In this study, the effects of particle size, crystal phase and morphology on the overall solar
cell performance were examined. It was found that the TiO
2 nanoparticle film with smaller
particles ~10 nm in diameter resulted in a lower light-to-electricity conversion efficiency than
larger particles with diameter of ~25 nm. Photoanode coated with larger particles had higher
light harvesting efficiency due to better light scattering ability. Rutile and anatase are the most
common forms of TiO
2 but anatase based DSSCs showed better photovoltaic performance.
Electrochemical impedance spectroscopy (EIS) studies also revealed that the electron lifetime
was longer and the charge transport was faster in anatase films. Meanwhile, a new
photoanode material rutile nanobundle had been synthesized for the first time using
conventional oven-drying method. The potential of rutile nanobundle for efficient DSSC had
been demonstrated. It was shown to have higher electron mobility than the typical TiO
2
nanoparticle layer. The overall sunlight conversion efficiency for the nanobundle DSSC
reached 7.9% with the incorporation of anatase nanoparticles. EIS measurement indicated that
nanobundles photoanode possessed long electron lifetime and high electron mobility
facilitating charge transport. The stability test showed that this 1D hierarchical DSSC had
durable performance at room conditions for more than a week making it suitable future
applications with further improvement.
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