10 % small-area CIS cell under NIR

Report on smallarea CIS solar cell demonstrator 10 efficiency for NIRillumination 20 for 1sun illumination and its stability Efficiency target is 10 215 mAcm2 JSC 600 mV VOC and 78 FF under NIRillumination and 20 43 mAcm2 JSC 600 mV VOC and 78 FF under 1sun illumination Stability target is T80 performance under 1sun at 85 C load for 1000 h Report on approach to reduce root mean square roughness Rt 40 nm for the CIS cell stack