3289452 PNCs perovskite nanocrystals 217 3786984 PeNCs perovskite nanocrystals 42 1458392 PNC perovskite nanocrystal 15 3253843 PeNC perovskite nanocrystal 8 1460798 PNs perovskite nanocrystals 2 3889494 PKNCs perovskite nanocrystals 1 3881628 PVSK NCs perovskite nanocrystals 1 1065491 Pv-NCs perovskite nanocrystals 1