A sandwich-like structural model revealed for quasi-2D perovskite films | ARC Centre of Excellence in Exciton Science
TitleA sandwich-like structural model revealed for quasi-2D perovskite films
Publication TypeJournal Article
Year of Publication2021
AuthorsZheng, F, Hall, CR, Angmo, D, Zuo, C, Rubanov, S, Wen, Z, Bradley, SJ, Hao, X-T, Gao, M, Smith, TA, Ghiggino, KP
JournalJ. Mater. Chem. C
Volume9
Start Page5362
Abstract
The excellent performance and stability of perovskite solar cells (PSCs) based on quasi-2D Ruddlesden–Popper perovskites (RPPs) holds promise for their commercialization. Further improvement in the performance of 2D PSCs requires a detailed understanding of the microstructure of the quasi-2D perovskite films. Based on scanning transmission electron microscopy (STEM), time-resolved photoluminescence, and transient absorption measurements, a new sandwich-like structural model is proposed to describe the phase distribution of RPPs. In contrast to the conventional gradient distribution, it is found that small-n RPPs are sandwiched between large-n RPP phase layers at the front and back sides owing to crystallization initiated from both interfaces during film formation. This sandwich-like distribution profile facilitates excitons funneling from the film interior to both surfaces for dissociation while free carriers transport via large-n channels that permeate the film to ensure efficient charge collection by the corresponding electrodes, which is favorable for high-performance photovoltaics. This discovery provides a new fundamental understanding of the operating principles of 2D PSCs and has valuable implications for the design and optimization strategies of optoelectronic devices based on quasi-2D RPPs films.
Briefly describe the importance of this publication: 
A new sandwich-like structural model is proposed to describe the phase distribution of RPPs.
Will this item be attributed as an output of other ARC Projects?: 
No
Did you acknowledge the centre in this publication?: 
Yes
Were any international co-authors involved?: 
Yes
Were any of your co-authors not affiliated with the centre?: 
Yes
Reporting year: 
2021
Impact Factor - grouped: 
Is this a joint publication between nodes?: 
No
Please list collaborating nodes: 
International collaborating institutions: 
Shandong University
lexible Electronics Laboratory, CSIRO Manufacturing, Clayton, VIC 3168, Australia
Which Centre platforms are related to the research?: 
Impact Factor: 
7.059