(50b) Modifying Halide Perovskites with Small Molecules for Novel Functionality

The tunability of halide perovskites is becoming immense, and within this simple common theme in my title, we will explore how halide lead perovskites can be modified with molecular additives to enhance or induce new functionality. In one case, we show the addition of functional dipolar molecules can spontaneously crystalize into a layered structure of a self-assembled monolayer of the molecular additive and the perovskite that allows for simplified perovskite solar cell processing, namely that the hole transport layer and perovskite layer can be deposited in one step. Additionally molecular additives can control or relieve the strain within perovskite active layers in solar cells and be used to enhance the thermal cycling stability which is required for terrestrial and space applications. In a third instance, we add chiral molecules which impart spin selectivity in perovskites for novel transport phenomena with an example application of a spin LED.