The Physics and Chemistry of Halide Perovskite for Efficient & Durable Optoelectronic Devices

Halide perovskites have emerged as a new class of semiconductors with excellent
properties such as large tunable band-gaps, large absorption coefficients, long diffusion lengths, low effective mass and long radiative lifetimes. These have resulted in record efficiencies for photovoltaics surpassing that of Si. However, a major challenge for these materials is realizing long-term stability under light, temperature and humidity. In contrast,2D perovskites are a sub-class of 3D perovskites, have demonstrated excellent stability compared to the 3D perovskites.

In this talk I will describe our work over the past five years on 3D and 2D perovskites ranging from novel fundamental light-induced structural behaviors and its impact on charge transport, solvent chemistry and the synergy between 2D and 3D
perovskites in achieving durable and high-efficiency photovoltaic devices. Finally, if time permits, I will also present some new results, which offer an exciting prospects for developing single photon emitters.

Referencs:

1. Metcalf et al Two-dimensional perovskite templates for durable and efficient
formamidinium solar cells Science (2024 in press).

2. Hou et al Synthesis of 2D perovskite crystals via progressive transformation of quantum well thickness Nature Synthesis (2024)

3. Ultrafast relaxation of lattice distortionin 2D perovskites Nature Physics (2023)

4. Sidhik et al Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells Science 2022 Vol 377, Issue 6613 pp. 1425-1430

5. Li W et al Light-activated interlayer contraction in two-dimensional perovskites for high-efficiency solar cells. Nat Nanotechnol. 2022 Jan;l 7(1):45-52.

6. Sidhik et al Memory Seeds Enable High Structural Phase Purity in 2D Perovskite Films for High-Efficiency Devices. Adv Mater. 2021 Jul;33(29):e2007176.

7. Blancon JC et al, Semiconductor physics of organic-inorganic 2D halide perovskites. Nature Nanotechnol. 2020 Dec; 15(12):969-985.