The CEA at INES obtained flexible perovskite solar modules with a surface area of 11.6 cm2 and a power conversion efficiency of 18.9% (stabilized efficiency > 18.5%). To the best of our knowledge, this performance is a world record for the flexible perovskite modules over 10 cm2.
Perovskite-based solar cells have attracted a great attention in the last 10 years due to their excellent optoelectronic properties. Currently, the power conversion efficiencies of solar devices using these materials have exceeded 25% for single junctions and 29% in tandem structures with silicon. Record results were obtained on small areas in the order of 1 cm².
For some applications, the use of flexible substrates may be attractive for single-junction perovskite technology as it opens the way to high-speed, low-temperature printing processes. Thus, it becomes possible to use low cost substrates whereas inorganic flexible technologies, such as CIGS, require higher temperature processes and substrates that are more expensive.
Many teams around the world are trying to meet the challenges of making larger area devices with sufficient stability for real-life applications. This is one of the tasks that have set to themselves partners of the European APOLO project, in which CEA obtained these results.