UP-SCALING OF PRODUCTION PROCESSES FOR PRODUCING FLEXIBLE CZTS PHOTOVOLTAIC MODULES

摘要

At previous EU-PVSEC conferences an innovative technology for making photovoltaic foils was presented which is based on quaternary CZTS (copper zinc tin sulfide) semiconductor powder. In order to accelerate the development of a high speed roll-to-roll production process a cooperation project of several partners from academia and industry was launched in 2014. The overall aim of the project is the demonstration of a technology that allows producing flexible photovoltaic films made of abundant, non-toxic and highly stable material at a web speed of 40 m/min. For this purpose certain technological challenges needs to be tackled such as the development of a printing process which allows for the high speed deposition of a CTZS crystal mono-layer and the metallization in a roll-to-roll process. Furthermore the rear-side opening for contact formation requires a precise and fast "polishing" process of the polymer-semiconductor membrane preferably by a laser ablation process. Finally a process for depositing the TCO front side contact by non-vacuum techniques is developed. The current contribution describes the specification and definition phase of the processes to be used and highlights first successful proof-of-concept experiments. These results constitute important milestones towards the development of a high speed roll-to-roll process, which will enable the production of flexible PV films with a web speed of about 40 m/min and at production costs levels of about 0.30 ?/Wp in a mass manufacturing scenario.