High Dipole Moment Small Molecules Inducing Uniform Charge Accumulation under Low-Intensity Light Environment towards Highly Efficient and Stable Indoor Perovskite Solar Cells
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Indoor photovoltaics (IPVs) have attracted considerable interest owing to their potential applications to the indoor light harvester for operating low-power electronic devices. In this regard, perovskite solar cells (PSCs) are promising candidate for light energy harvester because of high indoor power conversion efficiency (iPCE) over 30%. However, PSCs still suffer from densely existing traps at the interfaces, which impedes uniform power generation under indoor light environment. In this presentation, we report a high dipole moment small molecules (M1 and M2[JHKim1] ). M1 and M2 facilitated charge accumulation of PSCs under low intensity light illumination by defect passivation effect when they were incorporated at the interface of electron transport layer. PSCs based on M1 [JHKim2] exhibited excellent iPCE over 32% and ambient operational stability, suggesting the versatile applicability of M1 [JHKim3] for boosting performances of perovskite IPVs