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. 2013 Jan 2;8(1):5. doi: 10.1186/1556-276X-8-5

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Copyright ©2013 Wu et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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PL spectra of solar cells and PL peak energy and integrated PL intensity. (a) PL spectra of the solar cell samples annealed with different temperatures. The laser excitation power is I_L = 0.3 W/cm². (b) PL spectra of the solar cells annealed with different temperatures. The laser excitation power is I_H = 3,000 W/cm². (c) PL peak energy and integrated PL intensity as a function of annealing temperatures under low excitation power I_L. The inset is the PL line width as a function of annealing temperatures. (d) PL peak energy and integrated PL intensity as a function of annealing temperatures under high excitation power I_H. The data obtained from the as-grown material is plotted at 650°C.