7 Further Thoughts

Studied in this paper was the dependence of the photoluminescence from silicon nanocrystals on excitation wavelength and power. Only one sample was studied in great detail and which showed a clear blueshift with both increased laser intensities and increased photon energies. The two other samples that were investigated showed this effect to a lesser degree. A thorough and systematic study of many samples would confirm whether the effect is related to the sample or related to silicon nanocrystals in general.

It is clear that silicon nanocrystals are an interesting subject of research. If quantum cutting can be exploited effectively and the electrons harvested from the nanocrystals, an improvement over wafer based panels would be possible (figure 21). Secondly, silicon nanocrystals may be produced in a process significantly cheaper than traditional panels. Thin films are considered, and even a paint based method which would be easily and widely applicable.

Figure 21: Solar spectrum and the portion that bulk Si solar panels convert into electric energy. The energy that is not used is fair game for a researcher.

Last, but most definitely not least, I’d like to thank the people in the Optoelectronic Materials research group for the opportunity to perform my bachelor’s project and their support during the project. Dolf Timmerman, Tom Gregorkiewicz, Wieteke de Boer, Kateřina Dohnalová, Saba Saeed and Ngo Ngoc Ha: thank you for your time and patience!