Thermodynamic analysis for the prediction of N composition in coherently grown GaAsN for a multi-junction solar cell

Jun Kawano, Yoshihiro Kangawa, Tomoe Yayama, Tomonori Ito, Koichi Kakimoto, Akinori Koukitu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thermodynamic analysis was performed to investigate the coherent growth of GaAs 1-xN x thin films with low N content. In the present study, a new algorithm of the simulation code was developed to theoretically predict the relationship between solid composition and growth condition. This algorithm is applicable to wider varieties of combinations of gaseous sources than is the traditional algorithm. The system using trimethylgalllium (TMG), AsH 3, and NH 3 was analyzed with the new code, and the results showed that the required input partial pressure ratio of NH 3 to the group-V element is over 99% for incorporation of a small percent of N into a solid. It is difficult to incorporate N into the solid when the input V/III ratio is low, while in the case of a high input V/III ratio, stable growth with a small percent of N can proceed. In the case of coherently grown GaAs 1-xN x, the lattice constraint from the substrate would suppress the incorporation of nitrogen. On the other hand, a higher input Ga partial pressure ratio enhances the stable growth of GaAs 1-xN x with a small N content, though this condition tends to easily induce generation of dislocations. Furthermore, a much lower optimum N/As ratio in input gas can be achieved in the system with dimethylhydrazine (DMHy). This result confirms that the difference in gaseous sources has a great effect on N incorporation. When determining well-optimized experimental growth conditions, these influences including crystallinity should all be considered.

Original languageEnglish
Title of host publicationProgram - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011
Pages496-500
Number of pages5
DOIs
Publication statusPublished - Dec 1 2011
Event37th IEEE Photovoltaic Specialists Conference, PVSC 2011 - Seattle, WA, United States
Duration: Jun 19 2011Jun 24 2011

Other

Other37th IEEE Photovoltaic Specialists Conference, PVSC 2011
CountryUnited States
CitySeattle, WA
Period6/19/116/24/11

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All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

Cite this

Kawano, J., Kangawa, Y., Yayama, T., Ito, T., Kakimoto, K., & Koukitu, A. (2011). Thermodynamic analysis for the prediction of N composition in coherently grown GaAsN for a multi-junction solar cell. In Program - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011 (pp. 496-500). [6186002] https://doi.org/10.1109/PVSC.2011.6186002