Flexible CH3NH3PbI3 perovskite solar cells with high stability based on all inkjet printing

Abstract

At present, there are many reports on the preparation of large area perovskite solar cells based on ink-jet printing. These works mainly focus on the ink-jet printing electrode and perovskite films. The hole transport layer, electron transport layer and other modified layers in the cell structure are still completed by spin coating or coating. We have successfully realized large area CH3NH3PbI3 perovskite solar cells based on all inkjet printing, including PEN/Ag NWS bottom electrode, Ag NWS top electrode, PEDOT:PSS hole transport layer, etc. It was showed that PC71BM Electron transport layer, PEI modified layer and CH3NH3PbI3 perovskite film with high density and good uniformity can be obtained. We have fabricated CH3NH3PbI3 perovskite solar cells with area of 120 cm2, 150 cm2 and 180 cm2 respectively. The results show that the power conversion efficiency of the perovskite solar cell with effective area of 120 cm2 is as high as 16.78% (VOC = 1.02 V, JSC = 21.96 mA/cm2, FF = 75%; 150 cm2: 12.56%, 180 cm2: 10.68%), which is the highest efficiency reported so far. In addition, when the device is placed in the air for six months without packaging, the photoelectric conversion efficiency is reduced to 90% of the initial value. However, the photoelectric conversion efficiency of CH3NH3PbI3 perovskite solar cells with Fluorinated thermoplastic polyurethane film (FTPU) package is only reduced by 5%, which shows excellent device stability.