The Potential of Multijunction Perovskite Solar Cells

Metal
halide perovskite semiconductors offer rapid, low-cost deposition
of solar cell active layers with a wide range of band gaps, making
them ideal candidates for multijunction solar cells. Here, we combine
optical and electrical models using experimental inputs to evaluate
the feasible performances of all-perovskite double-junction (2PJ),
triple-junction (3PJ), and perovskite–perovskite–silicon
triple-junction (2PSJ) solar cells. Using parameters and design constraints
from the current state-of-the-art generation of perovskite solar cells,
we find that 2PJs can feasibly approach 32% power conversion efficiency,
3PJs can reach 33%, and 2PSJs can surpass 35%. We also outline pathways
to improve light harvesting and demonstrate that it is possible to
raise the performances to 34%, 37%, and 39% for the three architectures.
Additionally, we discuss important future directions of research.
Finally, we perform energy yield modeling to demonstrate that the
multijunction solar cells should not suffer from reduced operational
performances due to discrepancies between the AM1.5G and real-world
spectrum over the course of a year.