High Performance Colloidal Quantum Dot Photovoltaics by Controlling Protic Solvents in Ligand Exchange

Colloidal quantum dots (CQDs) are promising light harvesting materials for realization of solution processible, highly efficient multipurpose photovoltaics (PVs). Here, PbS CQD solar cells are reported with improved certified power conversion efficiency performance of 10.4% by simply controlling protic solvents (alcohols) in ligand exchange process. With shorter chain alcohols, the mobility of charge carriers is an order-of-magnitude improved due to the enhanced interparticle coupling; on the other hand, excessive removal of passivating ligands by very protic solvent, methanol (MeOH) induced undesirable traps on CQD surface. Consequently, it has been found that high performance CQD PVs require a solvent engineering for balance between native leaving ligands with incoming ligands during ligand exchange process for well-controlled surfaces of CQDs and enhanced carrier concentration of conductive CQD films.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-08
Language
English
Keywords

CHARGE-CARRIER DIFFUSION; SOLAR-CELLS; HALIDE PASSIVATION; SOLIDS; SURFACE; NANOCRYSTALS; ALCOHOLS; STATES; LAYERS; ACID

Citation

ADVANCED ENERGY MATERIALS, v.7, no.15

ISSN
1614-6832
DOI
10.1002/aenm.201700301
URI
http://hdl.handle.net/10203/225613
Appears in Collection
NT-Journal Papers(저널논문)
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