Alternative designs for nanocrystalline silicon solar cells

Photonic and plasmonic structures for enhancing efficiency of thin film silicon solar cells

“…There have also been reports that the grain size also increases when we increase the growth temperature and the ratio of <220>/<111> orientation of grain also increase which is favorable for transport [61,64]. Additionally, we also mention for the ease of writing all temperatures mentioned are the set temperatures, whereas the actual temperature on the substrate may be a little lower (SS may be close but plastic substrates may be at ~20⁰C than set temperature).…”

“…The next step was the fabrication of nc-Si:H on the nano imprinted Kapton substrates which can handle higher temperatures. Here we have used a superlattice design [64,242] to deposit nc-Si:H, with alternating layers of nc-Si:H/a-Si:H allowing independent control of crystallinity [243,244]. The solar cell with a thin ~816 nm nc-Si:H/a-Si:H absorber layer , having a 12 period structure.…”

“…The thickness of both the layers plays significant role in the design and performance of the solar cell, for example thicker a-Si:H layers may provide a barrier for carrier flow and thicker nc-Si:H layers make it too crystalline. There is an in depth study of the design and fabrication of superlattice nc-Si:H solar cells in the doctoral thesis by A. Madhavan[64].…”

Influence of Oxygen on Electronic properties of Nanocrystalline Silicon

“…Hence there is a trade-off here. The broken bonds in high temperature materials could be repaired by doing post-H anneal and preliminary results have been worked by A. Madhavan [61].…”

Fabrication of high quality, low bandgap amorphous Silicon & amorphous Silicon Germanium alloy solar cell by Chemical Annealing

“…The reactor also has a shutter which lies between substrate and electrode, ensuring no deposition while plasma is being ignited or being allowed to stabilize. (iii) More efficient power coupling leads to higher electron densities [100] (iv) Prevents plasma non uniformities like the skin effect and edge effect [100] Electrons being lighter than ions have higher mobility than ions and are thus more easily collected on an electrode during the positive cycle, leading to depletion of electrons from dark spaces and an increase in glow space potential with respect to the electrodes. The potential acquired by the glow space is so large that during most of the RF cycle no electrons can leave it, leading to what is better known as negative "self bias".…”