Enhancements    

Photo-Switchable Fullerene-Based Materials as Interfacial Layers in Organic Photovoltaics

Photo-Switchable Fullerene-Based Materials as Interfacial Layers in Organic Photovoltaics
Inventors: Luis Echegoyen, Danisha Rivera-Nazario, Michael Irwin
Patent No. 9,837,611

Description:
This patent focuses on a fullerene-based layer for use between the anode and cathode layers of an organic photovoltaic device. This fullerene-based layer acts to reject electron conductance to the electrode, which increases charge extraction from the photo-active layer.

Abstract:
Design and use of photo-switching, fullerene-based dyads of the design x-D-y-Aor D-y-A-x as interfacial layers (IFL) for organic photovoltaic (OPV) devices are described herein. The fullerene-based dyads and triads of the present invention contain electron-donating substituents such as porphyrins or phthalocyanines that exhibit charge separation states with long lifetimes upon irradiation, resulting in rejection of electrons reaching the electrode and concurrently promoting the conduction of holes. This phenomenon has a strong rectifying effect on the whole device, not just the interfaces, resulting in improved charge extraction from the interior of the photo-active layer. The invention further describes anchoring an IFL to the ITO surface as a monolayer, bilayer, or greater multilayers. One OPV design embodiment of the present invention embodiment involves the formation of covalent bonds via silane groups (-SiR3 ) as the anchor (x), to form siloxane bonds.

Issue Date: 12/05/2017
Application Date: 09/21/2012
Post Date: 02/28/2018

UTEP Docket No: 2011-014