講演情報
[15p-K405-8]Photophysical Properties of Inorganic Tin-Lead Alloyed Perovskite Nanocrystals
〇DAN DAN WANG1, Yusheng Li1, Shuzi Hayase1, Qing Shen1 (1.Faculty of Informatics and Engineering, The University of Electro Communications)
キーワード：
low-toxicity、tin-lead alloyed perovskite nanocrystals
1. Background and Objective
Alloying tin into lead-based halide perovskite nanocrystals (PNCs) presents a promising route toward low-toxicity and air-stable optoelectronic devices. However, significant energetic disorder (i.e., static and dynamic disorder) has thus far impeded their use in lighting applications compared to pure lead-based PNCs. A comprehensive understanding of both static and dynamic disorder, as well as their effects on photophysical properties, is essential for overcoming this challenge.
2. Experiment details
We synthesized pure CsPbBr3 and tin-lead alloyed PNCs using the hot-injection method, following the previously established synthetic protocol. We investigated their optical absorption properties across a range of temperatures (15-300 K). Furthermore, we examined their structural characteristics using the atomic-resolution scanning transmission electron microscopy (STEM) technique.
3. Results and Conclusion
In this work, we employed temperature-dependent static and transient absorption spectroscopy to differentiate between the contributions of static disorder (such as defects, impurities, etc.) and dynamic disorder (carrier-phonon interactions) in tin-lead alloyed PNCs. We find that static disorder primarily governs band-tail defect states, while dynamic disorder controls bandgap renormalization, both of which collectively regulate fast carrier trapping and slow band-to-band recombination processes. Additionally, we investigate the defects in tin-lead alloyed PNCs using atomic-resolution STEM and theoretical calculations. Specifically, antisite defects such as PbCs and SnCs, along with vacancies like VBr, are found to create deep-level defects in tin-lead alloyed PNCs. These insights provide essential guidelines for designing highly luminescent, low-toxicity tin-lead alloyed PNCs, accelerating their integration into optoelectronic applications.
Alloying tin into lead-based halide perovskite nanocrystals (PNCs) presents a promising route toward low-toxicity and air-stable optoelectronic devices. However, significant energetic disorder (i.e., static and dynamic disorder) has thus far impeded their use in lighting applications compared to pure lead-based PNCs. A comprehensive understanding of both static and dynamic disorder, as well as their effects on photophysical properties, is essential for overcoming this challenge.
2. Experiment details
We synthesized pure CsPbBr3 and tin-lead alloyed PNCs using the hot-injection method, following the previously established synthetic protocol. We investigated their optical absorption properties across a range of temperatures (15-300 K). Furthermore, we examined their structural characteristics using the atomic-resolution scanning transmission electron microscopy (STEM) technique.
3. Results and Conclusion
In this work, we employed temperature-dependent static and transient absorption spectroscopy to differentiate between the contributions of static disorder (such as defects, impurities, etc.) and dynamic disorder (carrier-phonon interactions) in tin-lead alloyed PNCs. We find that static disorder primarily governs band-tail defect states, while dynamic disorder controls bandgap renormalization, both of which collectively regulate fast carrier trapping and slow band-to-band recombination processes. Additionally, we investigate the defects in tin-lead alloyed PNCs using atomic-resolution STEM and theoretical calculations. Specifically, antisite defects such as PbCs and SnCs, along with vacancies like VBr, are found to create deep-level defects in tin-lead alloyed PNCs. These insights provide essential guidelines for designing highly luminescent, low-toxicity tin-lead alloyed PNCs, accelerating their integration into optoelectronic applications.