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Trihalide perovskite photovoltaic (P-PV) solar cells have a promise to be connected into tandems with inorganic PV systems. In this paper, we present p-i-n GaAs & P-PV cells in either in a series way or parallel connection. Comparisons made for two types of tandems by a non-monolithic connection of two experimental sub-cells and results are being discussed based on simulation analysis. It is shown that the parallel connection is always preferable when the sub-cells photocurrent is not balanced while V oc (open circuit voltage) is close to each other. Total efficiency over 20% is demonstrated for GaAs shading effect by MAPbI 3 (methylammonium lead halide) film, with achieved J sc -41 mA/cm 2 (short circuit current density) and high V oc.