August 13th, 2020
We have studied cells with different construction techniques, using CNT electrodes from the same batch. Similar techniques were employed for data analysis as above (figure 4, table 2). The power transfer curves (figure 4b) show a peak power transfer P at R = R. Gold Guard Ring. The presence of the gold guard ring increases ISC by a factor ~2.5, while VOC remains approximately constant. R is lower by ~3.5 and P is ~2 times greater. Graphite Counter Electrode. Both VOC and ISC are greater than the normally constructed cell and P is ~12 times greater. Thin Cell. When
Load voltage (mV)
Load resistance (Q)
FIGURE 3: Electrical characteristics of the CNSCs. The extracted parameters are presented in table 2. a) I-V characteristics of the cells as indicated. b) Power delivered to the load for all cells as described in the legend for a).
the enriched side is facing the incident solar radiation (“up”), the power is slightly larger than when the regular side is facing the incident radiation (“down”). Both VOC and ISC are lower by factors of ~5 and ~3, which in itself is undesirable. However, optimum power transfer occurs at a much lower resistance.
TABLE 2: Optimized CNSCs.