Centre Suisse d’électronique et de microtechnique (CSEM), senior R&D Engineer,
BU-V – Sustainable energy, silicon solar cells group
Photovoltaic (PV) technology is expected to be a key pillar of the future low-carbon energy mix, with crystalline silicon (c-Si)-based technologies (such as the silicon heterojunction (SHJ) technology) accounting for the lion’s share of it. To achieve net-zero carbon emission targets by 2035, Europe alone needs to install 8.8 TW capacity of PV. On the one hand, barriers in achieving such TW-scale deployment in a sustainable manner are well known: use of scarce materials (Ag, In), imported wafers with high carbon footprint, etc. On the other hand, widely accepted technological roadmaps for PV mostly dismiss these caveats, as the race to higher efficiency and lower cost remains the key driver for the PV industry. As a result, many current c-Si PV technology processes and materials are not developed while considering the environmental concerns.
In such context, this work focuses on two next generations of solar cell technologies, that are foreseen to significantly increase the efficiency of PV devices, and investigates solutions at cell level to reduce their environmental impacts. This presentation will give first an overview of the two solar cell technologies under study which are the SHJ-IBC and the SHJ-IBC/perovskite tandem. Second, the focus will be put on the development of indium free transparent conductive oxides (TCOs) used for both solar cell technologies and leads to further improve their environmental impact will be given
 IBC stands for interdigitated back contact.
Dr. Adeline Lanterne
CEA, LITEN, Solar Technologies Department
INES, National Institute for Solar Energy
Date of update April 24, 2023