Hybrid Organic-inorganic halide perovskites are emerging semiconducting materials that have shown over 23% in power conversion efficiency (PCE) for solar cells. The most prominent materials, three-dimensional (3D) perovskites, have limited scope for structural engineering and exhibit instability when encounter with moisture and heat. Here, we focus on studying the structure-property relationship in low-dimensional materials, where large organic cations can be inserted in the structure to increase the stability and structural diversity. We are interested in developing white-light emitting materials for solid-state lighting applications. Here we study the lead bromide-based and mixed bromide/chloride systems and have found a direct correlation between the distortion of the inorganic framework and the emission. Following this principle, we have synthesized and characterized a series of hybrid perovskite materials which emit white-light at room temperature. We have developed the first complete series of two-dimensional (2D) Dion-Jacobson (DJ) hybrid halide perovskites with the general formula (A’)(A)n-1PbnI3n+1 (A’ = 3-(aminomethyl)piperidinium (3AMP) or 4-(aminomethyl)piperidinium (4AMP), A = methylammonium (MA)). The higher layer member (n = 4) has demonstrated good performance, with the initial PCE of 7.3% and increased PCE of 12.0% with formamidinium incorporation.

Creator

• Mao, Lingling

DOI

• https://doi.org/10.21985/n2-53mg-aj70

Subject

• Chemistry

Language

• en

Alternate Identifier

• etdadmin_upload_625542
• http://dissertations.umi.com/northwestern:14439

Keyword

• Inorganic
• Optoelectronics
• Hybrid Perovskite

Date created

• 2018-01-01

Resource type

• Dissertation

Rights statement

• In Copyright