Perovskite and PbS quantum dots (QDs) tandem solar cells demonstrate significant advantages in surpassing the efficiency limits of single‐junction devices due to the spectral complementarity between the wide bandgap (≈1.55 eV) perovskite top cell and the narrow (≈0.95 eV) PbS QDs bandgap bottom cell. However, the hole transport layer of the perovskite top solar cell is a challenge for the tandem solar cells, resulting in the performance still lagging. Herein, the effects of two types of hole transport layers (HTLs), Spiro‐OMeTAD, and NiO X , on the performance of four‐terminal (4‐T) and two‐terminal (2‐T) tandem solar cells are systematically investigated through the 1D Solar Cell Capacitance Simulator simulation. For 4‐T tandem solar cells, simulations predict that a device using Spiro‐OMeTAD can achieve an efficiency of 27.03%, whereas one using NiO X can reach 24.56%. In addition, in the 2‐T tandem device, the efficiencies of the two devices are 24.17% and 23.38%, respectively. Based on the simulation results, the corresponding 4‐T and 2‐T tandem devices are fabricated with efficiencies of 27.05% and 17.11%, respectively. Thus, these findings will accelerate the optimization of the performance of perovskite and PbS QDs tandem solar cells approaching their theoretical efficiency limit.
Ling et al. (Thu,) studied this question.