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Identification and Dynamics of Microsecond Long-Lived Charge Carriers for CsPbBr3 Perovskite Quantum Dots, Featuring Ambient Long-Term Stability
- Title
- Identification and Dynamics of Microsecond Long-Lived Charge Carriers for CsPbBr3 Perovskite Quantum Dots, Featuring Ambient Long-Term Stability
- Authors
- Cho; Kayoung; Park; Youmin; Jo; Hyeonyeong; Seo; Sumi; Moon; Jiyoung; Lee; Soo Jeong; Seong Yeon; Yoon; Seog Joon; JaeHong
- Ewha Authors
- 박재홍
- SCOPUS Author ID
- 박재홍
![scopus](/images/layout/icon2.png)
- Issue Date
- 2024
- Journal Title
- Journal of Physical Chemistry Letters
- ISSN
- 1948-7185
- Citation
- Journal of Physical Chemistry Letters vol. 15, no. 21, pp. 5795 - 5803
- Indexed
- SCIE; SCOPUS
![scopus](/images/layout/scopus2.gif)
- Document Type
- Article
- Abstract
- We analyze the stability and photophysical dynamics of CsPbBr3 perovskite quantum dots (PeQDs), fabricated under mild synthetic conditions and embedded in an amorphous silica (SiOx) matrix (CsPbBr3@SiOx), underscoring their sustained performance in ambient conditions for over 300 days with minimal optical degradation. However, this stability comes at the cost of a reduced photoluminescence efficiency. Time-resolved spectroscopic analyses, including flash-photolysis time-resolved microwave conductivity and time-resolved photoluminescence, show that excitons in CsPbBr3@SiOx films decay within 2.5 ns, while charge carriers recombine over approximately 230 ns. This longevity of the charge carriers is due to photoinduced electron transfer to the SiOx matrix, enabling hole retention. The measured hole mobility in these PeQDs is 0.880 cm2 V-1 s-1, underscoring their potential in optoelectronic applications. This study highlights the role of the silica matrix in enhancing the durability of PeQDs in humid environments and modifying exciton dynamics and photoluminescence, providing valuable insights for developing robust optoelectronic materials. © 2024 American Chemical Society.
- DOI
- 10.1021/acs.jpclett.4c01024
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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