Full text loading...
(a) Schematic of the device highlighting the arrangement of PV cell/collection fiber with relation to the excitation beam. (b) Absorption curves in absolute units for CdSe/ZnS and PbS QDs. Overlaid emission curves (dashed) for CdSe/ZnS and PbS QDs with Stoke’s shift marked by double headed arrows.
(a) The effect of changing the distance between excitation and collection points for a PbS sample on the emission spectrum. The graphs are shifted vertically for clarity. (b) Similar effect for a PbS sample. The inset compares the peak emission redshifts with distance for PbS and CdSe/ZnS samples.
(a) LSC and PV current ratio as a function of QD solution concentration. Top and right axes correspond to PbS, bottom and left to CdSe/ZnS QDs. The response of PbS sample is shown at 5 and 20 min after illumination. (b) Integrated optical efficiency as a function of time for LSCs with different fluorescent species. Inset shows the reversal of photodarkening by blocking the incident radiation for a short period of time (arrow) in the PbS sample and the slower photo-oxidative decay (dotted line) by following the normalized over a few hours.
Article metrics loading...