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Mechanically-Stacked and Electrically-Connected Two-Terminal Tandem Module
K. Nakamura, Y. Ohshita
Simulation, Tandem, Module, Design
Perovskites and Other Non-Silicon Materials and Devices, Multijunctions/Tandems
Subtopic: Tandems
Event: 38th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BV.2.54
480 - 482
ISBN: 3-936338-78-7
Paper DOI: 10.4229/EUPVSEC20212021-3BV.2.54
0,00 EUR
Document(s): paper, poster


We would like to propose a new configuration of tandem solar modules. It is a Mechanically-Stacked and Electrically-Connected two-terminal tandem module, that is to say, MSEC tandem module. The basic idea is very simple, just to connect the output terminals of the top and bottom modules of a mechanically-stacked four-terminal tandem module. Just by doing so, you can make high efficiency two-terminal tandem module easily and inexpensively. To validate this concept, a specific MSEC tandem module was designed and its electrical characteristics were calculated by SPICE simulation. The top module fabricated with 71 mm square III-V cells and the bottom module fabricated with 79 mm square Si cells are connected in series to form a MSEC 2-terminal tandem module, which allows the top and bottom currents to be matched. As a result, we were able to minimize the losses associated with the 2-terminal configuration and confirmed that the output power is almost the same as that of a 4-terminal tandem module.