Dr. Tomoko Yamamoto

Materials scientist developing solid-state battery electrolytes.

Published preprints (2)

Advanced MaterialsJun 14, 2026

Solid-State Electrolytes for Grid-Scale Sodium Batteries

Tomoko Yamamoto

A comparative study of sulfide and oxide solid electrolytes for sodium-ion batteries targeted at stationary storage. We report ionic conductivities, interfacial resistance, and dendrite suppression, and argue that earth-abundant sodium chemistries are a credible low-cost path for long-duration grid storage.

DOI: 10.5072/zenodo.1000006

SolarMay 9, 2026

Stability of Perovskite-Silicon Tandem Cells Under Thermal Cycling

Tomoko Yamamoto, Hiroshi Tanaka & Maya Okafor

We report accelerated thermal-cycling results for monolithic perovskite-silicon tandem photovoltaics across 1,200 cycles between -40 and 85 C. We identify halide segregation at the perovskite/transport-layer interface as the dominant degradation pathway and show that a 2D passivation layer recovers 94% of initial efficiency after cycling. We discuss implications for outdoor module lifetimes.

DOI: 10.5072/zenodo.1000001