Fig. 5. (a–d) Schematic diagram of different perovskite–Si tandem solar cells, (e) EQE of perovskite and silicon tandem solar cells for 2T, 3T (IBC), and 4T configuration, and (d) highest reported efficiency by a different configuration of perovskite–Si tandem solar cells, (reproduced from ref. 158 with permission from ACS publications, copyright 2017).
