Imec announced an improvement of its 4cm2 perovskite/silicon tandem photovoltaic module, achieving a power conversion efficiency of 23.9%. Reaching this level, imec is the first to achieve a module-on-cell stack that outperforms the stand-alone silicon solar cell.   Perovskite solar cells have many desirable properties, as they can achieve a high power conversion efficiency, are inexpensive to produce, and have a high absorption efficiency in sunlight. Additionally, perovskite solar cells or m...