Near-infrared and ultraviolet to visible photon conversion for full spectrum response perovskite solar cells

In this work, full spectrum response perovskite solar cells have been achieved by introducing UC and DC layer for the NIR and UV light utilization of sunlight. On the basis of the NiO/Ag/NiO transparent electrode, the efficient plasmon-enhanced NaYF4: Yb3+, Er3+/NaYF4: Yb3+, Tm3+/Ag composite layers deposited on the back side of the devices lead the PCE to be largely enhanced from 16.1% to 19.2% under 1.5 W cm−2 sunlight illumination. The PCE can be further improved to 19.5% by introducing an UV to visible DC layer (Eu(TTA)2(Phen)MAA) in the incident light side of the devices. Overall, the UC and DC effects give rise to the highest PCE performance of 19.5% and noticeable current density value of 27.1 mA cm−2 among the reported PSCs. The long-term stability and light stability have been greatly improved through the external encapsulation of the UC and DC layers, suggesting the great potential for application in spectral broadening and stability enhancement to PSCs. The present work offers a novel approach in exploiting the full spectral response of PSCs and demonstrates application potential for photovoltaic family under constant and concentrated sunlight conditions.217