Daegu Gyeongbuk Institute of Science and Technology

Qd Solar Inc.

Kookmin University Industry Academy Cooperation Foundation

Jongmin Choi

Edward Hartley Sargent

Younghoon Kim

Sjoerd Hoogland

Jea Woong Jo

Fanglin Che

Francisco Pelayo Garcia De Arquer

Sanghun Han

The present invention relates to an inorganic perovskite quantum dot-based solar cell capable of providing a significantly excellent photoelectric conversion efficiency compared to the related art by increasing a light absorption capacity even though a photoactive layer has a limited thickness. Specifically, the inorganic perovskite solar cell may include: an electron transport layer that is disposed on a transparent electrode; a photoactive layer having a flat structure that is disposed on the electron transport layer and includes inorganic perovskite quantum dots; an organic hole transport layer that is disposed on the photoactive layer and includes nanopatterns; and a back electrode that is disposed on the organic hole transport layer.

Inorganic perovskite quantum dot-based solar cell including nanostructured back electrode and method of manufacturing the same

The present disclosure provides a method for facet-selective passivation on each crystal facet of colloidal nanocrystals via solution-phase ligand exchange process, thereby providing highly-passivated and colloidally-stable nanocrystal inks. This ligand exchange strategy separately addresses polar and non-polar facets precluding from deleterious nanocrystal aggregation in the colloid. The method involves the introduction of alkali metal organic complexes during metal halide conventional solution exchanges, and one specific example is Na·Ac. Alkali metal ions stabilize and passivate non polar facets whereas polar facets are passivated through metal halides. This strategy leads to a significant decrease in nanocrystal aggregation during and after ligand exchange, and to improved photophysical properties stemming from this. The resulting nanocrystal solid films exhibit improved stability, retain their absorption features, and have a minimized Stokes shift.

Passivation of nanocrystals tailored to different facets, and its application to optoelectronic devices

Growing community of inventors

Daegu, South Korea

Jongmin Choi