A Mini-Review: The Rise of Triple-Junction Silicon-Perovskite-Perovskite Solar Cells

Recently, the multijunction (MJ) solarcells have gained interest and have a lot of promise going forward. As MJ solarcells with an increasing number of absorber layers can reduce the thermalization and the nonabsorption losses of the device, it has then been proposed to overcome the Shockley–Queisser (S–Q) maximum efficiency limit. The preparation of the metal halide perovskite using a solution processing method with tunable bandgaps has made them an ideal candidate to integrate with the silicon photovoltaic, forming MJ silicon-perovskite (Si-PVK) solar cells. Benefitting from these, 33.90% power conversion efficiency (PCE) has been realized for the Si-PVK MJ solar cell, which is comparable to the S–Q maximum efficiency limit in the range of ≈1.10–≈1.30 eV. Furthermore, the PCE of Si-PVK solar cells can potentially increase with increasing the number-junction of perovskite device. Taking advantage of this, the research on the triple-junction (TJ) silicon-perovskite-perovskite (Si-PVK-PVK) solar cells has gained attention, although it is still in an early stage of development. In this mini-review, the working mechanism, the design principle, and the progress of TJ Si-PVK-PVK solar cells are discussed. Finally, future outlooks in this field are also provided.