Month: March 2021

The group welcomes a new graduate student Dharini Varadharajan. Dharini got her BS in Chemical Engineering from Anna University in 2020. She will be co-advised by Prof. Boudouris and Prof. Dou and she will work on organic radical-perovskite hybrid materials and optoelectronic devices. Welcome to the group!

The group is selected for an award by Department of Energy, Solar Energy Technologies Office (SETO), aiming at developing stable perovskite materials, solar cells and mini-modules. This is a joint effort with Prof. Brett Savoie (simulation) and Prof. Jianguo Mei (manufacturing). DOE news release can be found here. Big congratulations!

Kang and Linrui’s work on Lead-free organic-perovskite hybrid quantum well LEDs has been published in ACS Nano. Congratulations! Read the story here.

We report Sn(II)-based organic–perovskite HQWs employing molecularly tailored organic semiconducting barrier layers for efficient and stable LEDs. Collaborating with Libai Huang group, we demonstrate the energy transfer from organic barrier to inorganic perovskite emitter occurs faster than the intramolecular charge transfer in the organic layer. Incorporating a bulky small bandgap organic barrier in the HQW, charge transport is enhanced and ion migration is greatly suppressed. We demonstrate a HQW-LED device with pure red emission, a maximum luminance of 3466 cd m^–2, a peak external quantum efficiency up to 3.33%, and an operational stability of over 150 h, which are significantly better than previously reported lead-free perovskite LEDs.

We welcome Catherin Galvis Guiral from Universidad Nacional de Colombia, department of chemical engineering to join us for 6 months. Catherin will be co-advised by Prof. Dou and Prof. Boudouris working on radical-organic hybrid electronics. Welcome to the group!

Aihui and Kang’s work on highly efficient halide perovskite light-emitting diodes via molecular passivation has been published in Angewandte Chemie International Edition. Big congratulations!! Read the story here.

Metal halide perovskites are promising for applications in light‐emitting diodes (LEDs), but still suffer from defects‐mediated nonradiative losses, which represent a major efficiency‐limiting factor in perovskite‐based LEDs (PeLEDs). Reported here is a strategy to synthesize molecular passivators with different anchoring groups for defects passivation. The passivated perovskite thin films exhibit improved optoelectronic properties as well as reduced grain size and surface roughness, thus enable highly efficient PeLEDs with an external quantum efficiency of 15.6 %. Our results provide new fundamental insights into the role of organic molecular passivators in boosting the performance of PeLEDs.