posted on 2020-03-18, 11:33authored byWayesh Qarony, Mohammad I. Hossain, Vladislav Jovanov, Alberto Salleo, Dietmar Knipp, Yuen Hong Tsang
Perovskite/silicon
tandem solar cells are considered as one of
the cost-effective solutions for determining high energy conversion
efficiencies. Efficient photon management allows improving light incoupling
in solar cells by reducing optical losses. The optics relies upon
the interface morphology, and consequently, the growth mechanism of
the top cell on the bottom cell is crucial for the implementation
of efficient perovskite/silicon tandem solar cells. To describe the
interface morphologies of perovskite/silicon tandem solar cells, a
three-dimensional surface algorithm is used that allows investigating
the perovskite solar cells deposited on the textured crystalline silicon
solar cells. We distinguish between two extreme cases in which the
film grows only in the direction of the substrate normal or in the
direction of the local surface normal. The growth mode has significant
influence on the film roughness, the effective thickness of the film,
the optics of the solar cell, and the photovoltaic parameters. The
optics is investigated by finite-differencetime-domain simulations.
The influence of the interface morphology on the photovoltaic parameters
is discussed, and guidelines are provided to reach high short-circuit
current density and energy conversion efficiency.