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Saturday, 19 October 2019
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PbSCdS solar cell 6percent

The highly potential solar cell technology based on colloidal quantum dots (CQD), still has to overcome several problems in order to climb above the competing technologies. One of such bottlenecks is the lower than predicted open-circuit voltage due to the defects in the lattice of the QDs.

The recent work from the group of Prof. Watt (Oxford University) published in ACS’s journal Chemistry of Materials, suggests an approach to increase the voltage without a negative impact on the current. “This is done by developing a passivation strategy that uses the synergistic effect of a core/shell structure and ligands coordination to passivate CQD surfaces” tells the first author Dr. Neo.

Contrary to the sophisticated techniques of building up a solar cell, the authors decided to utilize the technology, which has an easy and cheap potential for scale-up, namely spin-coating from solutions.

Using this method, they assembled the solar cells from PEDOT:PSS, QDs and ZnO layers sandwiching them between aluminium and ITO electrodes. The core of the work was to study the influence of the QDs structure on the cell efficiency.

By varying the size of the PbS core and thickness of CdS shell, the authors could increase the open-current voltage from 0.41 to 0.66 volts. Choosing a right ligand for the QDs allowed them to simultaneously increase the current from 18 to 22 mA per sq.cm of the cell.

“Using this approach, we were able to boost the photocurrent without losing the effect of shell passivation and our best device demonstrated an impressive 6% power conversion efficiency” tells Prof. Watt.

You can get more details on this research from the original article.

 
Image courtesy: ACS
 

More on the topic:
Quantum Dots Laser Developed
Record in Cd-free QLED efficiency
Efficient graphene-electrode based solar cells
QDs Plus MOF for enhanced Light-Harvesting

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