Additional file 1.

Figure S1. XPS spectrum of 600°C sample. Figure S2. SEM images of samples obtained at different temperatures: (a) 600°C, (b) 800°C. Figure S3. Raman spectra of 600°C sample. Figure S4. AFM images and corresponding height profiles of samples synthesized at different temperatures: (a) 600°C, (b) 800°C. Figure S5. The current density (J) versus voltage (V) curves of solar cell based on 400°C sample and the corresponding cells after HNO₃ treatment. (DOC 1633 kb)

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Cui et al. Nanoscale Research Letters 2012 7:453   doi:10.1186/1556-276X-7-453