| Most of the traditional perovskite solar cells use vacuum-evaporated gold and silver as electrodes.However,high-consumption vacuum technology and the precious metal are expensive.In addition,the infiltration of the precious metal into perovskite layer leads to the decrease of stability.These disadvantages,especially the stability concern,may restrict the large-scale commercial development of perovskite solar cells.With a similar work function to gold,carbon has the advantages of low-cost,convenient printing compared to vacuum deposition,and the ability to isolate water and oxygen.Therefore,it is appealing to use carbon as an alternative electrode material to achieve low-cost and highly stable perovskite solar cells.In this paper,self-encapsulation technology and carbon-based perovskite solar cells are studied from two aspects:with and without hole transport layer.Hole-free carbon-based perovskite solar cell,with Sn O2as the electron transport layer,one-step anti-solvent MAPb I3as the active layer,screen printed carbon electrode.The overall structure of the device is simple,the fabrication method is simple,in the darkroom condition,under the condition of no encapsulation,the 120-day efficiency is maintained in the initial value of more than 93%.It shows that the carbon electrode has a good ability to block water and oxygen.Taking P3HT as hole layer,P3HT as the hot hole transport layer has the advantages of excellent photoelectric performance,low cost and easy manufacture.The complete device is produced with an impressive efficiency of 13.37%,and it is important to note that the carbon-based perovskite solar cell has excellent light stability compared to the hole-free solar cell.Moreover,in nitrogen environment,the PCE of the device remains87%of its initial value with continuous illumination for 1000 hours.In contrast,the PCE of the device without P3HT remains only 60%after illumination for 500 hours. |
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