  The current density-voltage characteristic (JV) is a critical tool for
understanding the behaviour of solar cells. In this article, we present an
overview of the key aspects of JV analysis and introduce a user-friendly
flowchart that facilitates the swift identification of the most probable
limiting process in a solar cell, based mainly on the outcomes of
light-intensity-dependent JV measurements. The flowchart was developed through
extensive drift-diffusion simulations and a rigorous review of the literature,
with a specific focus on perovskite and organic solar cells. Moreover, the
flowchart proposes supplementary experiments that can be conducted to obtain a
more precise prediction of the primary performance losses. It therefore serves
as an optimal starting point to analyse performance losses of solar cells.
