Affiliation:
1. Institute for Advanced Materials and Manufacturing Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA
2. The Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
3. Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
Abstract
AbstractQuasi‐2D metal halide perovskites (MHPs) are an emerging material platform for sustainable functional optoelectronics, but the uncontrollable, broad phase distribution remains a critical challenge for applications. Nevertheless, the basic principles for controlling phases in quasi‐2D MHPs remain poorly understood, due to the rapid crystallization kinetics during the conventional thin‐film fabrication process. Herein, a high‐throughput automated synthesis‐characterization‐analysis workflow is implemented to accelerate material exploration in formamidinium (FA)‐based quasi‐2D MHP compositional space, revealing the early‐stage phase growth behaviors fundamentally determining the phase distributions. Upon comprehensive exploration with varying synthesis conditions including 2D:3D composition ratios, antisolvent injection rates, and temperatures in an automated synthesis‐characterization platform, it is observed that the prominent n = 2 2D phase restricts the growth kinetics of 3D‐like phases—α‐FAPbI3 MHPs with spacer‐coordinated surface—across the MHP compositions. Thermal annealing is a critical step for proper phase growth, although it can lead to the emergence of unwanted local PbI2 crystallites. Additionally, fundamental insights into the precursor chemistry associated with spacer‐solvent interaction determining the quasi‐2D MHP morphologies and microstructures are demonstrated. The high‐throughput study provides comprehensive insights into the fundamental principles in quasi‐2D MHP phase control, enabling new control of the functionalities in complex materials systems for sustainable device applications.
Funder
National Science Foundation
Alfred P. Sloan Foundation
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献