title: Nb2O5 as a new electron transport layer for double junction polymer solar cells.
abstract: Nb(2)O(5) as a new electron transport layer (ETL) was used for double junction polymer solar cells. The Nb(2)O(5) ETL was prepared by spin coating a Nb(2)O(5) sol-gel solution onto the active layer of the optical front subcell. The double junction devices using Nb(2)O(5) ETL exhibit an open circuit voltage (V(oc)) of 1.30 V, which is close to the sum of the s of the individual subcells. The current density-voltage (J-V) simulation showed that the double junction device performance using Nb(2)O(5) as ETL could be significantly increased by reducing the series resistance (R(se)) and matching the current densities of the individual subcells.
authors.affiliation: Center for Advanced Photovoltaics, Department of Electrical Engineering, South Dakota State University, Brookings, SD 57007, USA.
authors.forename: Mahbube K
authors.initials: MK
authors.lastname: Siddiki
authors.forename: Swaminathan
authors.initials: S
authors.lastname: Venkatesan
authors.forename: Qiquan
authors.initials: Q
authors.lastname: Qiao