This work develops a combinational use of solvent additive and in‐line drying oven on the flexible organic photovoltaics to improve large‐area roll‐to‐roll (R2R) slot‐die coating process. Herein, addition of 1,8‐diiodooctane (DIO) in the photoactive layer is conducted to yield a performance of 3.05% based on the blending of poly(3‐hexylthiophene) (P3HT) and [6,6]‐phenyl C 61 ‐butyric acid methyl ester (PC 61 BM), and a very promising device performance of 7.32% based on the blending of poly[[4,8‐bis[(2‐ethylhexyl)oxy] benzo[1,2‐b:4,5‐b’] dithiophene‐2,6‐diyl] [3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl]] (PTB7) and [6,6]‐phenyl C 71 ‐butyric acid methyl ester (PC 71 BM). Based on this R2R slot‐die coating approach for various polymers, we demonstrate the high‐performance result with respect to the up‐scaling from small high‐PCE cell to large‐area module. This present study provides a route for fabricating a low‐cost, large‐area, and environmental‐friendly flexible organic photovoltaics. We studied the mutual effect of solvent additive and drying process in the R2R process on the performance of roll‐to‐roll flexible polymer solar cells. The power conversion efficiency of the roll‐to‐roll slot‐die–coated PSCs based on PTB7 and PC 71 BM can be significantly improved to 7.32%. This study demonstrated a universal roll‐to‐roll approach towards high‐performance flexible polymer solar cells.
A universal roll‐to‐roll slot‐die coating approach towards high‐efficiency organic photovoltaics
Progress in photovoltaics ; 25 , 11
2017
Article (Journal)
English
module , Butyric acid , roll‐to‐roll , slot‐die , Photovoltaic cells , flexible , Coating , Solar cells , Drying ovens , Blending , Carbonyls , organic photovoltaics
BKL: | 53.36 Energiedirektumwandler, elektrische Energiespeicher |