The ninth international SolTech conference successfully took place from 5th October to 8th October 2020 as an online conference with more than 150 participants. Invited Speakers from Melbourne (Lianzhou Wang), Seoul (Nam-Gyu Park), Göteborg (Christian Müller) and Berlin (Claudia Draxl) gave live talks and all five KeyLabs were connected in a mixed live and presence format. On the second day, each KeyLab organized local poster and oral presentations. On 7th October and 8th October the doctoral students of SolTech organized an online symposium for young scientists. SolTech demonstrated for the first time an efficient and an interactive conference combining live and local contributions.