Engineering topics

Mohite, Aditya

Publications and source records attributed to Mohite, Aditya.

3 records

DOE OSTI2024

PEC Performance Measures from Literature Reports

This dataset is a capture of PEC experimental performance metrics data aggregated from publications and included here in the measurement and format provided by the authors. The measurements captured are based on rate of hydrogen production by PEC devices under illumination. Original creator of this dataset: Wen-Hui (Sophia) Cheng (National Cheng Kung University) Contributors to this dataset: Joel Ager (LBNL), H. Nishiyama et al. (Meiji University), I. Holmes-Gentle (EPFL), Yanfa Yan (University of Toledo), Aditya Mohite (Rice University), Zetian Mi (University of Michigan).

08 HYDROGEN↗

DOE OSTI2024

Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

Abstract Excitons, bound electron–hole pairs, in two-dimensional hybrid organic inorganic perovskites (2D HOIPs) are capable of forming hybrid light-matter states known as exciton-polaritons (E–Ps) when the excitonic medium is confined in an optical cavity. In the case of 2D HOIPs, they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the excitons. However, the fundamental properties of these self-hybridized E–Ps in 2D HOIPs, including their role in ultrafast energy and/or charge transfer at interfaces, remain unclear. Here, we demonstrate that >0.5 µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P modes. These E–Ps have high Q factors (>100) and modulate the optical dispersion for the crystal to enhance sub-gap absorption and emission. Through varying excitation energy and ultrafast measurements, we also confirm energy transfer from higher energy E–Ps to lower energy E–Ps. Finally, we also demonstrate that E–Ps are capable of charge transport and transfer at interfaces. Our findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

42 ENGINEERING↗

DOE OSTI2023

Strategies to improve the mechanical robustness of metal halide perovskite solar cells

We report on the mechanical properties of high-efficiency perovskite solar cells (PSCs) with different chemical components by measuring the fracture energy (G c ) of films and devices. With the help of both macroscopic and microscopic techniques, we identify the locations where fracture takes place in the devices (either adhesive or cohesive failure) with various material and device structures. We propose strategies that can improve the fracture energy of PSCs based on the measured G c : the use of ozone-nucleated atomic layer deposition to improve charge transport layer robustness and the use of 2D perovskites and morphology control to improve the perovskite robustness. Our findings offer a pathway to rationally study the mechanical properties of PSCs and enable such cells to be more mechanically robust to reach commercial viability.

14 SOLAR ENERGY↗