| 초록 |
Hole Transport Layers (HTLs) have a critical role to improve power conversion efficiencies (PCEs) and air-stability in perovskite solar cells (PSCs). Although Spiro-OMeTAD, general HTL in PSCs, is superior to PCEs, poor electrical and air-stability associated with this HTL prevent them from entering the market. Here, we attempted to apply novel HTLs to PSCs mainly consisting of small molecules without any dopants. The initial performances of PSCs using these HTLs with the structure of ITO/SnO2/perovskite/HTL/Au structure were poor, recording 3% of PCE. However, the gradual improvements were observed, recording over 15% of PCE after 17 days, which is comparable performance to Spiro-OmeTAD. This phenomenon suggests importance of developments of HTLs without dopants to realize stable PSCs. As the results were based on novel HTLs with molar concentrations equivalent to Spiro-OMeTAD, we expect further improvements of stability and PCEs simultaneously after optimization of these HTLs. |
