Abstract
Optoelectronic applications, such as photovoltaics (PVs) and light-emitting diodes (LEDs), play a key role in addressing the global energy crisis. Yet, they demand new semiconductors with high stability, low environmental impact, and low cost. One of the attractive ways of synthesizing semiconductor materials is their colloidal synthesis at the nanoscale, leading to nanocrystals (NCs). This thesis focuses on a promising family of NCs extensively investigated during the last decade, namely NCs based on halide perovskites and their derivatives.
Halide perovskite nanocrystals (PNCs) display appealing optoelectronic properties due to high defect tolerance, tunable crystal structures and dimensions, and versatile synthesis. However, a comprehensive optimization of these PNCs synthesis to enhance their stability and optical properties is lacking. Furthermore, the understanding of the fundamental structure-property relationships in emerging PNCs is still very limited. At the same time, the toxicity of lead (Pb) present in the most efficient PNC compositions demands the development of eco-friendly lead-free PNCs for optoelectronic applications.
In this dissertation, we have identified the relationships between the synthesis and the key properties of emerging or novel PNCs, starting from the popular CsPbI3 and then moving towards Pb-free compositions. In particular, we have (i) enhanced the phase stability of CsPbI3 PNCs by tailoring the reaction temperature, (ii) achieved highly luminescent CsMnCl3 PNCs by tailoring the synthesis of the emissive crystalline phase, and (iii) proposed the first-ever syntheses of Cs2TiX6 (X = Br and Cl) PNCs and phase-pure AgBiI4 perovskite-inspired NCs with enhanced stabilities for potential nonlinear optical applications.
We believe that the results of this thesis will encourage other researchers and practitioners in the field to further investigate the promising perovskites and perovskite-inspired NCs that we have identified and eventually enable their usage in real-life optoelectronics applications.
Halide perovskite nanocrystals (PNCs) display appealing optoelectronic properties due to high defect tolerance, tunable crystal structures and dimensions, and versatile synthesis. However, a comprehensive optimization of these PNCs synthesis to enhance their stability and optical properties is lacking. Furthermore, the understanding of the fundamental structure-property relationships in emerging PNCs is still very limited. At the same time, the toxicity of lead (Pb) present in the most efficient PNC compositions demands the development of eco-friendly lead-free PNCs for optoelectronic applications.
In this dissertation, we have identified the relationships between the synthesis and the key properties of emerging or novel PNCs, starting from the popular CsPbI3 and then moving towards Pb-free compositions. In particular, we have (i) enhanced the phase stability of CsPbI3 PNCs by tailoring the reaction temperature, (ii) achieved highly luminescent CsMnCl3 PNCs by tailoring the synthesis of the emissive crystalline phase, and (iii) proposed the first-ever syntheses of Cs2TiX6 (X = Br and Cl) PNCs and phase-pure AgBiI4 perovskite-inspired NCs with enhanced stabilities for potential nonlinear optical applications.
We believe that the results of this thesis will encourage other researchers and practitioners in the field to further investigate the promising perovskites and perovskite-inspired NCs that we have identified and eventually enable their usage in real-life optoelectronics applications.
| Original language | English |
|---|---|
| Place of Publication | Tampere |
| Publisher | Tampere University |
| ISBN (Electronic) | 978-952-03-3177-1 |
| ISBN (Print) | 978-952-03-3176-4 |
| Publication status | Published - 2023 |
| Publication type | G5 Doctoral dissertation (articles) |
Publication series
| Name | Tampere University Dissertations - Tampereen yliopiston väitöskirjat |
|---|---|
| Volume | 913 |
| ISSN (Print) | 2489-9860 |
| ISSN (Electronic) | 2490-0028 |