Efficient bifacial semitransparent perovskite solar cells with silver thin film electrode

Nonprecious Copper‐Based Transparent Top Electrode via Seed Layer–Assisted Thermal Evaporation for High‐Performance Semitransparent n‐i‐p Perovskite Solar Cells

“…This analogous behavior of the Au‐based and Cu‐based solar cells seems to suggest that copper, in the same way as gold, could provide greater inherent stability to the devices compared to other metals typically used in PSCs such as Ag and Al, whose corrosion and reaction with perovskite are recognized as a major origin of self‐degradation in perovskite solar cells . We emphasize that this interpretation should be subject to further scrutiny, even though recent reports on semitransparent Ag‐based PSCs with poorer stability under inert conditions seem to support our hypothesis …”

Efficient Semitransparent Perovskite Solar Cells Using a Transparent Silver Electrode and Four-Terminal Perovskite/Silicon Tandem Device Exploration

“…To further improve the optical properties of the Ag electrode, the 10 nm thick MoO 3 optical coupling layer is evaporated to act as the antireflector which enhances the transmittance of the Ag electrode; it could also reflect some of the transmitted light back into the perovskite and improve the light absorption in the top cell. These optical mechanisms have been proved in our previous calculations and experimental reports [28]. To enhance the electron collection ability of the Ag electrode, a low-work-function BCP modifying layer is inserted between the PCBM and Ag to align the energy levels and decrease the electron transport barrier at the PCBM/Ag interface, which has been approved as an effective way to improve the current density and fill factor of PSCs.…”

“…Simultaneously, no obvious current hysteresis has been observed, as the PCE only displays a small variation from 13.10% to 13.38% for the opposite voltage sweep directions. This performance is much better than that of the PSC with only a Ag transparent electrode [28]. While in the tandem architecture, also shown in Figure 3(a) and Table 1, the bottom Si cell obtains a PCE of 3.65% with J SC = 9.17 mA/cm 2 , V OC = 0.56 V, and FF = 0.71; the PCE and J SC of the bottom cell are much lower than those of the original Si cell (14.2% and 36 mA/cm 2 , resp.…”

“…It has been proved in our previous works [28][29][30][31] and other reports [32][33][34] that the ultrathin Ag film with a suited optical coupling layer could meet the requirements of a transparent electrode. Our simulations [28] about bifacial semitransparent PSCs have shown that the maximum possible current density of a device illuminated from the Ag side rapidly increases with the decreasing Ag thickness, while it gradually decreases for the reverse illumination direction from the ITO side. This is due to the fact that the thinner the thickness, the higher the transmittance for Ag electrodes, but the conductive requirement limits the Ag thickness to its percolation threshold.…”

“…This is due to the fact that the thinner the thickness, the higher the transmittance for Ag electrodes, but the conductive requirement limits the Ag thickness to its percolation threshold. To further improve the Ag transmittance, the strategy of the outer optical coupling layer [28][29][30][31][32] has been verified, while the reduced percolation limit to 6 nm is also possible by including a cooling stage during a high-rate evaporation of the Ag [35,36]. In consequence, the semitransparent PSCs using the ultrathin Ag electrode may be the better top cell for the cost-effective four-terminal perovskite/Si devices.…”