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Creating metal saturated growth in MOCVD for CdTe solar cells
Journal of Crystal Growth, Volume: 607, Start page: 127124
Swansea University Authors: Stuart Irvine , Ochai Oklobia, Steven Jones, David Lamb , Giray Kartopu
Accepted Manuscript under embargo until: 2nd February 2024
DOI (Published version): 10.1016/j.jcrysgro.2023.127124
Determining the thermodynamic conditions in MOCVD growth of II-VI semiconductor materials is not as straightforward as in III-V growth where Group V hydrides are generally used. This paper establishes a technique, using in situ laser reflectometry, to ensure that the thermodynamic equilibrium is und...
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Determining the thermodynamic conditions in MOCVD growth of II-VI semiconductor materials is not as straightforward as in III-V growth where Group V hydrides are generally used. This paper establishes a technique, using in situ laser reflectometry, to ensure that the thermodynamic equilibrium is under metal saturated growth. This has been applied to the arsenic doping of CdTe solar cells where it was shown that increasing the II/VI precursor ratio resulted in an increase in As dopant incorporation. The growth kinetics were determined by the diisopropyl tellurium (DIPTe) concentration for II/VI precursor ratios above 2. A method is presented where the change in II/VI precursor ratio can be predicted for different positions in a horizontal MOCVD chamber that has, in turn, enabled variation in NA and the solar cell open circuit voltage (Voc) to be determined as a function of the II/VI precursor ratio. This gives new insight to the thermodynamic drivers in MOCVD growth for improved solar cell Voc and is a method that could be applied to MOCVD of other II-VI semiconductors.
A1. Phase equilibria; A3. Metal organic chemical vapour deposition; B1. Cadmium compounds; B2. Semiconducting cadmium compounds; B2. Semiconducting II–VI materials; B3. Solar cells
Faculty of Science and Engineering
The authors would like to acknowledge funding by the Engineering and Physical Sciences Research Council (EPSRC), United Kingdom via the grant EP/W000555/1 and from the European Regional Development Fund (ERDF) and the Welsh European Funding Office (WEFO) for funding the 2nd Solar Photovoltaic Academic Research Consortium (SPARC II) which supported this research. The authors also acknowledge support from First Solar Inc.