Additives in Halide Perovskite for Blue-LightEmitting Diodes: Passivating Agents or Crystallization Modulators?

Nur Fadilah Jamaludin^a, Natalia Yantara^a, Benny Febriansyah^a, Yeow Boon Tay^b, Bening Tirta Muhammad^b, Shoba Laxmi^c, Swee Sien Lim^d, Tze Chien Sum^d, Subodh Mhaisalkar^a^,^b, Nripan Mathews^a^,^b

^aEnergy Research Institute @ NTU, Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore

^bSchool of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore

^cDivision of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore

^dDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#OMIECs22. Organic mixed-ionic-electronic conductors and their application in Emerging Technologies

Online, Spain, 2022 March 7th - 11th

Organizers: Aristide Gumyusenge and Alexander Giovannitti

Contributed talk, Natalia Yantara, presentation 310
DOI: https://doi.org/10.29363/nanoge.nsm.2022.310
Publication date: 7th February 2022

Successful adoption of defect management and carrier confinement strategies in Ruddlesden−Popper (RP) perovskites has driven the impressive improvements to performance of perovskite-based light-emitting diodes (PeLEDs) seen to date. Although functional additives have been advantageous in mitigating defects, their influence over crystallization behavior of RP (L2Am−1PbmX3m+1) perovskites has yet to be fully studied. This is especially important for blue-emitting monohalide RP perovskites, where stringent control over m domain distribution is needed for efficient PeLEDs. Herein, we investigate the effect of triphenylphosphine oxide (TPPO) on crystallization behavior of blue RP (PBA2Csm−1PbmBr3m+1) perovskites. Despite TPPO addition, its absence in the resulting film eliminates its role as a passivating agent. Instead, TPPO acts as crystallization and phase distribution modulator promoting the formation of a narrow distribution of higher m domains with higher Br content. In doing so, an enhancement of ∼35% was noted with the champion device yielding efficiency of 3.8% at λ of 483 nm.

References:

[1] ACS Energy Lett. 2021, 6, 12, 4265–4272

Acknowledgements:

This research was funded by Ministry of Education, Singapore (Grants MOE2018-T2-2-083 and MOE2019-T2-2-097). The photophysical measurements are made possible through the support from the Ministry of Education, Singapore under its AcRF Tier 2 Grant MOE-T2EP50120-0004 and the National Research Foundation, Singapore under its NRF Investigatorship (Grant NRF-NRFI2018-04). We acknowledge the Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University, Singapore, for use of their electron microscopy/X-ray facilities

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