Stable and reliable optical power converting devices are obtained using vertical multi-
junction laser power converters. They are based on the GaAs and the InP material systems …

Optical wireless power transmission systems are attracting attention as a new power
transmission technology because they can supply power wirelessly over long distances. In …

Photovoltaic multijunction power-converting III–V semiconductor devices generate electrical
power from the optical energy of laser beams. They exhibit conversion efficiencies reaching …

III–V photovoltaic devices have demonstrated exceptional performance across various
applications, with controlled crystal fracturing, known as controlled spalling, emerging as a …

Summary Three-dimensional (3D) interconnects increase chip power density and enable
miniaturization. Photonic chips require new processes to enable transitioning to 3D …

The optimization of III‐V‐based photovoltaic cells involves addressing the trade‐off between
optical losses due to grid shading and electrical losses due to series resistance. In this work …

III-V compound semiconductors provide a high degree of flexibility in bandgap engineering
and can be realized through epitaxial growth in high quality. This enables versatile spectral …

Optical wireless power transmission (OWPT) attracts attention because it enables wireless
power transfer over longer distances than current wireless power transfer methods …

Highly reflective back surfaces are critical for reaching the detailed balance efficiency limits
of photovoltaics. In addition to being highly reflective, the back surface and contact of the cell …

This thesis addresses barriers to adopting high-efficiency photovoltaic devices through
innovative structured surfaces, device designs, and epitaxial growth. I demonstrate …