Carbon nanotube hole-transporting and collecting layers for semi-transparent, flexible and low-cost solid-state photovoltaic cells

Time period: 2016-03-01 to 2018-02-28

Project leader: Gerrit Boschloo

Funder: Swedish Energy Agency

Type of award: Project grant

Total fundning: 1 689 658 SEK

The perovskite solar cell (PSC), dye solar cell (DSC) and quantum dot solar cell (QDSC) are emerging solar cell technologies, whose energy payback times could be considerably lower than that of silicon solar cells. The commercialization of the high-efficiency (> 20 %) PSCs has been hindered so far by the use of unstable and expensive hole-transporting material (HTM) and gold counter electrode (CE). It was observed by the applicants that a press-transferred single-walled carbon nanotube (SWCNT) film with drop-cast molecular HTM functions as a hybrid HTM-CE in the PSC, yielding considerable 15.5 % power conversion efficiency. Furthermore, very transparent SWCNT film functioned as the front contact of a transparent QDSC, as well as a DSC CE, meaning that both contacts of solar cells could be replaced by SWCNTs. In this project, the solar cell with an SWCNT contact(s) will be developed to maximum performance and the manufacturing process of the cell will be upscaled to pre-industrial stage