Mitigating the degradation of MAPbI₃ perovskite solar cells under continuous light soaking with ZnO@CdS:epoxy short‐wavelength‐sunlight shielded films

The stability of MAPbI3‐based (MA stands for methylammonium) perovskite solar cells (PVSCs) has been carefully examined by ZnO@CdS nanoparticle‐embedded epoxy films (EP‐ZC films), device encapsulation (of glass sheet and UV‐curing gel), and in different temperatures, 10 oC, room temperature (no temperature control), and 65 oC. EP‐ZC films are used for shielding the short wavelength of the sunlight (UV, near UV, violet, and deep blue) which causes the photodegradation of MAPbI3 and hence the decline of power conversion efficiency (PCE) of PVSCs. Some external quantum efficiency (EQE) spectra of the device have been recorded alongside of the 500 hr continuous light soaking measurement of current density (J)−voltage (V) of the devices. The time‐of‐flight secondary ion mass spectroscopy (TOF‐SIMS) analysis has been performed for a quantitative comparison of the iodide derived from the degradation of MAPbI3 in the encapsulated devices with or without the light‐shielding EP‐ZC films at 10 oC and 65 oC, respectively. The EP‐ZC6 film shows the best protection for encapsulated PVSCs with a 98% of the initial PCE at 10°C after 500 hr continuous light soaking. In this study, from the continuous light soaking results we can prioritize the moisture, temperature, and light in the influence of the stability of PVSCs.This article is protected by copyright. All rights reserved.