Unconventional Materials that do more with Light
Dinesh Kabra a
a Department of Physics, IIT Bombay, Powai – Mumbai (India) – 400076
Proceedings of Device Physics Characterization and Interpretation in Perovskite and Organic Materials (DEPERO)
VALÈNCIA, Spain, 2023 October 3rd - 5th
Organizers: Sandheep Ravishankar, Juan Bisquert and Evelyne Knapp
Invited Speaker, Dinesh Kabra, presentation 035
DOI: https://doi.org/10.29363/nanoge.DEPERO.2023.035
Publication date: 14th September 2023

In this talk, I will give you an overview on the organic and halide perovskites semiconductors based activities taking place in our research group. These semiconductors have emerged as potential photonics materials for future commercial optoelectronic devices, however, face a major challenge of ambient stability. Organic LEDs have become a matured technology by now for small display industries with budget crossing 10s B$. I will discuss the device engineering results on single junction and multi-junction OLEDs.

In halide perovskites; we have results of single junction cell PCE ~ 21% and silicon/perovskite tandem cell PCE > 27%. We also made LEDs with decent luminance efficiency ~ 45 cd/A. In halide perovskites, the two-dimensional (2D) and quasi-2D halide perovskites have shown promising stability against ambient stability. Hence, the understanding of the photo-physics of 2D perovskites can be a tool to get an in-depth insight into these novel halide perovskites. In this talk, we will discuss the origin of broadband illumination and other emission peaks using temperature-dependent time-resolved photoluminescence (PL) spectra of 2D layered halide perovskites (i.e., (PEA)2PbBr4 and (PEA)2PbI4) semiconductors. We will show that broad emission in (PEA)2PbBr4 perovskite is observed due to coupling of electronic states in inorganic well part (PbBr­64-) and organic barrier part (PEA), which is in contrast to a proposed model based on self-trapped-exciton.


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