Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

摘要

Perovskite solar cells (PSCs) have been widely studied during the past 10 years.Albeit the excellent light-absorption ability, the thickness of the perovskite layer islimited to maintain effective control over morphology and carrier migration.Meanwhile, the quality of perovskite films is a crucial factor affecting the performanceof final devices. The traditional one-step process for preparing triplecationperovskite films suffers from small grain size, low crystallization quality,and many surface defects. Herein, in the process of triple-cation perovskite-basedsolar cells, a facile dosing strategy of a silver nanorods (AgNR) aqueous solutioninto the perovskite precursor is adopted. The localized surface plasmon resonanceeffect of AgNR enhances the light-capture ability of the perovskite layerwithout increasing the thickness. At the same time, the presence of appropriatewater helps to obtain high-quality perovskite films with larger grain size and fewerdefects. It is found that the synergy of AgNR and water successfully reduces thedefect density and increases mobility significantly. Consequently, a power conversionefficiency of 20.18% and a short-circuit current (J_(SC)) of 22.08 mA cm~(-2) isachieved. Meanwhile, an excellent fill factor beyond 82% is reported, which is oneof the highest values for triple-cation hybrid PSCs.