PbS depleted bulk heterojunction cells are a promising, lower cost alternative to Si photovoltaics. Spray-coating colloidal PbS quantum dots allows simple and efficient fabrication of devices over much larger areas than is possible with spin-coating. Monolayers of quantum dots can be sprayed with control of film morphology and subsequent ligand exchange. The smoothness of sprayed PbS monolayers depends upon surface chemistry of the synthesized quantum dots and spray-coating conditions. The photoresponse of depleted heterojunction cells on ZnO is correlated with surface chemistry and surface roughness. In addition, optical and scanning electron microscopy show relatively smooth 200-nm-thick films after 70 cycles of spray-coating, confirming successful sequential monolayer depositions.<br/>

Monolayer deposition of colloidal quantum dots by spray-coating

253rd National Meeting (2017)

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