期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 21, 页码 17932-17941出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02996
关键词
PEC cells; silicon; protecting overlayers; water splitting; solar hydrogen production; titanium dioxide; atomic layer deposition
资金
- Repsol, S.A
- Generalitat de Catalunya [2014SGR1638]
- European Regional Development Funds (ERDF, FEDER)
- MINECO [MAT2014-59961-C2, ENE2016-80788-C5-5-R, BES-2015-071618]
- Severo Ochoa Program (MINECO) [SEV-2013-0295]
A critical parameter for the implementation of standard high-efficiency photovoltaic absorber materials for photoelectrochemical water splitting is its proper protection from chemical corrosion while remaining transparent and highly conductive. Atomic layer deposited (ALD) TiO2 layers fulfill material requirements while conformally protecting the underlying photoabsorber. Nanoscale conductivity of ALD TiO2 protective layers on silicon-based photocathodes has been analyzed, proving that the conduction path is through the columnar crystalline structure of TiO2. Deposition temperature has been explored from 100 to 300 degrees C, and a temperature threshold is found to be mandatory for an efficient charge transfer, as a consequence of layer crystallization between 100 and 200 degrees C. Completely crystallized TiO2 is demonstrated to be mandatory for long-term stability, as seen in the 300 h continuous operation test.
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