Cu(In,Ga)Se2 Solar Cells: Device Stability Based on Chemical Flexibility (pages 957–961)
Jean-François Guillemoles, Uwe Rau, Leeor Kronik, Hans-Werner Schock and David Cahen
Article first published online: 5 AUG 1999 | DOI: 10.1002/(SICI)1521-4095(199908)11:11<957::AID-ADMA957>3.0.CO;2-1
Is “self-healing” the source of the stability of Cu(In, Ga)Se2-based solar modules? The proven remarkable stability and radiation hardness of Cu(In,Ga)Se2 (CIGS) solar cells stand in apparent contradiction to the fact that CIGS shows both short-range (metastable defect centers) and long-range (significant Cu migration) instabilities. The authors suggest that these instabilities may in fact be a prerequisite for CIGS's stability as they allow a degree of flexibility or “smartness” in accommodating externally imposed changes. Two self-healing cycles are proposed, in which copper species play a particularly important role.