Pathways to Efficient and Stable Perovskite/Silicon Tandem Solar Cells

In this presentation I will discuss the multiple ways how monolithic perovskite/silicon can be fabricated, built from textured silicon heterojunction solar cells, with an emphasis on solution of the perovskite top cell. Bulk and contact passivation of the perovskite are instrumental to obtain a high performance, which can be obtained through molecular additive engineering. Combined, this recently led to a certified power conversion efficiency of 33.7% for a monolithic perovskite/silicon tandem solar cell. This will be followed by a discussion about the outdoor performance of such tandems and the need for robust and perovskite-compatible encapsulation to do so. I will then move on to discuss reliability aspects of such tandems under accelerated degradation tests such as damp-heat testing, reverse-bias and potential induced degradation, as well as possible mechanical failure due to top-contact delamination. I will conclude my talk with arguing how bifacial perovskite/silicon tandems aid in improved performance as well as stability.