Controlled Growth of CH NH PbI Using a Dynamically Dispensed Spin-Coating Method: Improving Efficiency with a Reproducible PbI Blocking Layer.

ChemSusChem

MacDiarmid Institute for Advanced Materials and Nanotechnology and, School of Chemical and Physical Sciences, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand.

Published: June 2017

It is commonly believed that excess PbI has beneficial effects for perovskite solar cells owing to the modification of charge-transport behavior at interfaces, by surface passivation and by blocking electron-hole recombination. Here, we introduce a dynamically dispensed spin-coating technique in a two-step deposition to form a perovskite layer with controllable quantities of crystalline PbI . Using this technique, the concentration of CH NH I solution is kept constant at the reaction interface, ensuring smooth growth of films. By changing the spinning rate during the reaction, the PbI conversion ratio and perovskite cuboid size can be optimized, resulting in a power conversion efficiency improvement over control devices. This dynamically dispensed technique represents a repeatable method for compositional control in perovskite solar cells and improves our understanding of how a PbI blocking layer improves the performance of perovskite solar cells.

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Source
http://dx.doi.org/10.1002/cssc.201700449DOI Listing

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