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Fabrication and optical characterization of ultrathin III-V transferred heterostructures for hot-carrier absorbers
- Source :
- Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, Feb 2020, San Francisco, France. pp.6, ⟨10.1117/12.2544537⟩
- Publication Year :
- 2020
- Publisher :
- SPIE, 2020.
-
Abstract
- A hot-carrier solar cell (HCSC) is a high-efficiency photovoltaic concept where electrons and holes are at a higher temperature than the lattice, allowing an additional thermoelectric energy conversion. There are two requirements for a HCSC: establishing a hot-carrier population and converting the temperature into extra voltage through energy-selective contacts. We focus on the generation of hot carriers, and the design of absorbers that can make this generation easier. Fundamentally, this requires to increase the power density absorbed per volume unit, so the photocarriers cannot fully thermalize (phonon bottleneck). Beyond simply increasing the light intensity, the main control knobs to favor hot carriers include reducing the thickness of the absorber, increasing its absorptivity, and reducing its bandgap. In this proceeding, we report the fabrication of structures that aim at measuring the influence of these different parameters. We justify our choices for sample structure and fabrication method from the need for high thermal conductivity, in order to prevent lattice heating. We characterize our structures in order to determine precisely the final thickness of all layers, and the absorptivity of the absorber layer. These samples are to be used for an analysis of the temperature with many variable parameters, in order to better understand the thermalization mechanisms and design better absorbers. Ultimately, our objective is to implement all solutions together in order to evidence a hot carrier population under concentrated sunlight illumination.
- Subjects :
- Fabrication
Materials science
Band gap
Population
02 engineering and technology
01 natural sciences
7. Clean energy
law.invention
law
0103 physical sciences
Solar cell
[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
education
ComputingMilieux_MISCELLANEOUS
Power density
010302 applied physics
education.field_of_study
[PHYS.PHYS]Physics [physics]/Physics [physics]
business.industry
Photovoltaic system
Heterojunction
021001 nanoscience & nanotechnology
Light intensity
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic
Optoelectronics
0210 nano-technology
business
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX
- Accession number :
- edsair.doi.dedup.....6852fad661fc90f1e63d47517f4663a0