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We applied optical pump — THz probe spectroscopy to a series of polycrystalline thin film silicon solar cells treated using various technological steps. We found a clear correlation between the ultrafast carrier dynamics and the macroscopic parameters (like open-circuit voltage) characterizing the cells in a usual steady-state operation.
Piezoelectric PVDF-foils have been tested as transducers for pulse-echo sound attenuation measurements at 10–200 MHz between 4 and 300 K. Their performance is compared with quartz transducers. Measurements of dislocation resonance absorption in high purity copper single crystals are used to demonstrate that the thin foil PVDF transducers in contrast to quartz transducers, during cooling to low temperatures,...
Subbandgap defects in polycrystalline silicon thin films are investigated using photothermal deflection spectroscopy and photoluminescence. By applying rapid thermal annealing and hydrogen passivation, samples of different material quality are fabricated. An increasing defect absorption with increasing annealing temperature was measured, although the open circuit voltage of the respective solar cells...
Nanoporous energetic silicon is a promising new energetic material that can be integrated on-chip using current silicon bulk micromachining techniques. In this paper, we present the characteristics of the nanoenergetic reaction, including energy output, gas generation, and chemical products. The energy output is measured as 9.2 kJ/g, more than double that of TNT. The gas generation was measured as...
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