1. Laboratory of Inorganic Chemistry Department of Chemistry and Applied Biosciences ETH Zürich Vladimir‐Prelog‐Weg 1 Zürich CH‐8093 Switzerland
2. Laboratory for Thin Films and Photovoltaics Empa – Swiss Federal Laboratories for Materials Science and Technology Überlandstrasse 129 Dübendorf CH‐8600 Switzerland
3. Institute of Energy Science and Technology (SIEST) Sungkyunkwan University (SKKU) 2066, Seobu‐ro, Jangan‐gu Suwon Gyeonggi‐do 16419 Republic of Korea