Project IOTA

Excerpt

Innovative tandem architectures

Stéphane COLLIN, Research Director, CNRS

ANR reference : 22-PETA-0005

IOTA is developing new low-cost, high-efficiency solutions for tandem solar cells.

The project focuses on thin-film tandem solar cells on silicon to take advantage of industrially mature silicon technology for the bottom cell. It explores several solutions for the top cell, using materials already available in the community.

The aim is to achieve conversion efficiencies in excess of 30% with low-cost, industrializable processes, by proposing breakthrough solutions.

Transversal technological building blocks are being developed (light management, material deposition, interface layers, integration processes). They will be versatile and compatible with different cell architectures and types of thin film, to take advantage of the latest developments.

Keywords: Cells, Photovoltaics, tandem, silicon, thin films, interfaces, architecture

Tasks

Our researches

Materials

Development of interface materials on rough Si surfaces.

Processes

Development of processes for depositing perovskite on rough surfaces.

Development of breakthrough processes for nanostructuring and localized deposition.

Simulation

Simulation work on tandem solar cells supports these developments. Three different architectures are being explored for the integration of thin films on silicon.