We report on a new thin‐film Cu(In,Ga)Se2 (CIGS) solar cell record efficiency of 21.7%. In order to better understand this newest development, we describe the specific solar cell data as obtained from I–V measurement and diode analysis, quantum efficiency and secondary neutral mass spectrometry measurements. We hope that such a description will help to exploit the potential of this promising thin‐film solar technology even further. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) Thin‐film Cu(In,Ga)Se2 (CIGS) solar cells recently have shown a continual increase towards higher conversion efficiencies. In this Letter, the authors present the latest development with efficiencies up to 21.7% by describing the properties of such devices. These results demonstrate how highly capable multicrystalline thin‐film solar cells can be despite their small grains and their host of grain boundaries within the light absorbing material.