About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Energy Materials for Sustainable Development
|
Presentation Title |
The Role of Amorphous TiO2 Film in Performance of Si Photoanodes for Hydrogen Production by Photoelectrochemical Water Splitting |
Author(s) |
Mehrdad Abbasi Gharacheh, Jun Meng, Yutao Dong, Dane Morgan, Xudong Wang, Jinwoo Hwang |
On-Site Speaker (Planned) |
Mehrdad Abbasi Gharacheh |
Abstract Scope |
One application of amorphous TiO2 (a-TiO2) is to protect Si photoande in photoelectrochemical (PEC) cell for water splitting to produce hydrogen as a renewable source of energy. The variations in PEC performance of photoanodes were reported as growth conditions of a-TiO2 films by the atomic layer deposition (ALD) change. Meanwhile, intermediate phases with different atomic orderings compared to the amorphous network have been found in amorphous titania films, whose relationship with short range, medium range orderings (SRO/MRO), and film properties has not been clear yet. Fluctuation electron microscopy (FEM), which is a statistical analysis of calculating the normalized variance from nano-diffractions, is able to detect medium range orderings (MROs) in amorphous materials. Moreover, angular correlation (AC) function by cross-correlating the nano-diffractions is capable of extracting the possible symmetry of MROs. This work will present new findings about the evolution of MROs in a-TiO2 as a function of ALD growth condition. |