Ambient Condition, Three‐Layer Slot‐Die Coated Organic Photovoltaics with PCE of 10%

Abstract Organic photovoltaics have emerged as a low‐cost and sustainable technology suitable for integration into everyday life. Record power conversion efficiencies (PCE) are rising, having surpassed 18% for single‐junction devices. However, most work is still carried out using laboratory‐scale techniques and conditions which are not representative of what can be achieved in an industrial setting. Herein, the use of a high‐performance bulk‐heterojunction (BHJ) system (i.e., PM6:Y6C12) in fabricating devices with commercially available materials, with all organic layers slot‐die coated (hole transport layer, electron transport layer, and photoactive layer), without thermally treating the active layer, using non‐halogenated solvents, and in ambient condition is demonstrated. A conventional architecture is used, where the hole transport layer (PEDOT:PSS), the electron transport layer (PFNBr), and the photoactive layer (PM6:Y6C12), are all slot‐die coated in air from water, methanol, and o ‐xylene, respectively. Photovoltaic devices have an average efficiency of 10.1%, which is among the highest reported for devices with three slot‐die coated layers obtained in ambient conditions from halogen‐free solvents.