PbS quantum dots are of particular interest in solar photovoltaic applications, in which the semiconductor’s large Bohr exciton radius enables quantum size-effect tuning over the broad solar spectrum. Also this material offers avenues to tandem and multijunction solar cells from a single material via size-effect bandgap tunability. Moreover, their processing from the solution phase should in principle allow rapid, large-scale manufacturing and ready integration with flexible substrates, facilitating roll-to-roll processing.
Solar cell devices can be prepared as follows. The PbS Quantum Dot film is deposited in a layer-by-layer fashion by spin coating on HTL/ITO/glass substrate layers. P-type PbS quantum dots of various band gaps can be deposited. Then ETL and top electrode consisting of Ag or Au are deposited by thermal and electron beam evaporations.
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