Home
Resources
Publications
Homogenized Halides and Alkali Cation Segregation in Alloyed Organic-Inorganic Perovskites

Homogenized Halides and Alkali Cation Segregation in Alloyed Organic-Inorganic Perovskites

Juan-Pablo Correa-Baena, Yanqi Luo, Thomas M Brenner, Jordan Snaider, Shijing Sun, Xueying Li, Mallory A Jensen, Noor Titan Putri Hartono, Lea Nienhaus, Sarah Wieghold, Jeremy R Poindexter, Shen Wang, Ying Shirley Meng, etc.

Science. 2019 Feb 8;363(6427):627-631.

PMID: 30733417

Abstract:

The role of the alkali metal cations in halide perovskite solar cells is not well understood. Using synchrotron-based nano-x-ray fluorescence and complementary measurements, we found that the halide distribution becomes homogenized upon addition of cesium iodide, either alone or with rubidium iodide, for substoichiometric, stoichiometric, and overstoichiometric preparations, where the lead halide is varied with respect to organic halide precursors. Halide homogenization coincides with long-lived charge carrier decays, spatially homogeneous carrier dynamics (as visualized by ultrafast microscopy), and improved photovoltaic device performance. We found that rubidium and potassium phase-segregate in highly concentrated clusters. Alkali metals are beneficial at low concentrations, where they homogenize the halide distribution, but at higher concentrations, they form recombination-active second-phase clusters.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7790296	Rubidium iodide		7790-29-6	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: