Study of Instabilities and Degradation due to Moisture Ingress in the Molybdenum back contact of Cu(In,Ga)Se<inf>2</inf> Solar Cells

Abstract

Preliminary studies of instabilities and degradation due to moisture ingress into the molybdenum (Mo) back contact and its impact on the performance of Cu(In,Ga)Se <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> solar cells are presented. The samples along with reference devices were characterized to obtain an outline of the deteriorating effect. Overall, the resistivity and surface roughness of the Mo layer increased with exposure to humidity and has a significant impact on the device performance.