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Interdot Lead Halide Excess Management in PbS Quantum Dot Solar Cells
Author(s) -
AlbaladejoSiguan Miguel,
BeckerKoch David,
Baird Elizabeth C.,
Hofstetter Yvonne J.,
Carwithen Ben P.,
Kirch Anton,
Reineke Sebastian,
Bakulin Artem A.,
Paulus Fabian,
Vaynzof Yana
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202202994
Subject(s) - lead sulfide , materials science , photovoltaics , halide , quantum dot , perovskite (structure) , passivation , optoelectronics , iodide , photovoltaic system , solar cell , quantum yield , amorphous solid , nanotechnology , layer (electronics) , chemical engineering , inorganic chemistry , optics , chemistry , ecology , physics , organic chemistry , engineering , fluorescence , biology
Light‐harvesting devices made from lead sulfide quantum dot (QD) absorbers are one of the many promising technologies of third‐generation photovoltaics. Their simple, solution‐based fabrication, together with a highly tunable and broad light absorption makes their application in newly developed solar cells, particularly promising. In order to yield devices with reduced voltage and current losses, PbS QDs need to have strategically passivated surfaces, most commonly achieved through lead iodide and bromide passivation. The interdot spacing is then predominantly filled with residual amorphous lead halide species that remain from the ligand exchange, thus hindering efficient charge transport and reducing device stability. Herein, it is demonstrated that a post‐treatment by iodide‐based 2‐phenylethlyammonium salts and intermediate 2D perovskite formation can be used to manage the lead halide excess in the PbS QD active layer. This treatment results in improved device performance and increased shelf‐life stability, demonstrating the importance of interdot spacing management in PbS QD photovoltaics.