Dr. Lea Nienhaus, Assistant Professor

Professional Preparation/Appointments

B.S. Universität Ulm (2010)
Ph.D. University of Illinois at Urbana-Champaign (2015)
Postdoc, Massachusetts Institute of Technology (2015-2018)

Contact Information

Email nienhaus@chem.fsu.edu
Office 4001 CSL 850.645.8617

Programs of Research

Materials, Physical

research specialties

Environment and Energy, Nanoscience, Photochemistry and spectroscopy, Synthesis and Catalysis

Research Interest

Research in the Nienhaus lab aims to understand the detailed optoelectronic properties of semiconductors at the nanoscale, and their interactions in the ensemble. We hope to advance tip-enhanced microscopy beyond the current capabilities to probe the cause of reduced efficiencies in optoelectronic devices made of emerging (nano-)materials. Research directions will focus on synthesis of semiconductor materials such as quantum dots and perovskites, optical spectroscopy and the combination of optical spectroscopy and scanning probe microscopy. Applications of the materials investigated include photon upconversion. Efficient photon upconversion holds the potential for the improvement of emerging technology and breakthroughs in many areas, including solar energy and infrared sensing. Current triplet-triplet annihilation upconversion systems rely on metal-organic complexes and quantum dots as sensitizers but struggle with low achievable efficiencies. Bulk semiconductor materials like perovskites are explored as alternative sensitizers that could eliminate problems created by the existing quantum confined sensitizers.


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Wieghold, S.; Nienhaus, L., Precharging Photon Upconversion: Interfacial Interactions in Solution-Processed Perovskite Upconversion Devices. J. Phys. Chem. Lett. 2019, 11, 601-607.
VanOrman, Z.A.; Bieber, A.S.; Wieghold, S.; Nienhaus, L., A Perspective on Triplet Fusion Upconversion: Triplet Sensitizers Beyond Quantum Dots. MRS Communications 2019 9, 924-935.
Wieghold, S.; Bieber, A.S.; VanOrman, Z.A., Nienhaus, L., Influence of Triplet Diffusion on Lead Halide Perovskite-Sensitized Solid-State UpconversionJ. Phys. Chem. Lett. 2019 10, 3806-3811.
Wieghold, S.; Bieber, A.S.; VanOrman, Z.A.; Daley, L.; Leger, M.; Correa-Baena, J.-P.; Nienhaus, L., Triplet Sensitization by Lead Halide Perovskite Thin Films for Efficient Solid-State Photon Upconversion at Subsolar Fluxes. Matter 2019 10, 705-719.
Wieghold, S.; Tresback, J.; Correa-Baena, J.-P.; Hartono, N.T.P.; Sun, S.; Lui, Z.; Layurova, M.; VanOrman, Z.A.; Bieber, A.S.; Thapa, J.; Lai, B.; Cai, Z.; Nienhaus, L.; Buonassisi, T., Halide Heterogeneity Affects Local Charge Carrier Dynamics in Mixed-Ion Lead Perovskite Thin FilmsChem. Mater. 2019, 31, 3712-3721.