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Liftoff process for exfoliation of thin film photovoltaic devices and back contact formation

United States Patent

April 3, 2018
View the Complete Patent at the US Patent & Trademark Office
A method for forming a back contact on an absorber layer in a photovoltaic device includes forming a two dimensional material on a first substrate. An absorber layer including Cu--Zn--Sn--S(Se) (CZTSSe) is grown over the first substrate on the two dimensional material. A buffer layer is grown on the absorber layer on a side opposite the two dimensional material. The absorber layer is exfoliated from the two dimensional material to remove the first substrate from a backside of the absorber layer opposite the buffer layer. A back contact is deposited on the absorber layer.
Haight; Richard A. (Mahopac, NY), Hannon; James B. (Lake Lincolndale, NY), Oida; Satoshi (Yorktown Heights, NY)
International Business Machines Corporation (Armonk, NY)
14/ 880,808
October 12, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under CONTRACT NUMBER: DE-EE0006334 awarded by the Department of Energy. The Government has certain rights in this invention.