Study On Improving The Performance Of Perovskite Solar Cell With Organic/Inorganic Ferroelectric Materials PVDF/HfAlO

The major solar cell in the current solar cells market is based on crystal silicon photovoltaic cells. However, the production processes are very complex, much costs and energy consumption. The newly emerging perovskite solar cell uses cheap lead, halogen and amine salt, which are extremely rich in earth, that greatly reduce the manufacturing cost of solar cells. However, there are also many problems, such as poor stability, the sensitivity to oxygen, easy hydrolysis, and difficult to produce large areas of continuous perovskite thin film. At the same time, the efficiency of the perovskite solar is still need to be further improved.Inserting ferroelectric thin film into solar cell is an effective method for improving the efficiency. In this paper, organic PVDF, P(VDF-TrFE) and inorganic HfAlO were added into the perovskite solar cells. We studied the effect after adding ferroelectric film. The conclusions are as follows:1. The ultrathin ferroelectric film β- PVDF have been obtained by spin coating method. Substrates were treated by oxygen plasma for 3 minutes, 0.2% PVDF solution with DMF as the solvent, and the ultrathin PVDF film can be spinned coating when the speed was 5000 r.p.m.2. In the inverted organic solar cell, after introducting ultra-thin PVDF ferroelectric film, the device performance was slightly lower. After the polarization, the performance was significantly improved. After poling treatment at room temperature for 60 minutes, the open circuit voltage, short circuit current density, fill factor, and power conversion efficiency were increased from 0.54 V, 11.24 mA/cm2, 45%, 2.73% to 0.56 V, 14.21 mA/cm2, 46%, 3.67%, respectively. The PCE of the device with polarized PVDF was increased by 34.43%.3. For perovskite solar cells, the introduction of PVDF and P(VDF-TrFE) film can improve the performance of the solar cell. The performance of the P(VDF-TrFE) thin film cell was better than that with single PVDF ferroelectric film cell. The perovskite solar cell did not polarize after adding an external ferroelectric layer. In addition, the stability of the solar cell can be greatly enhanced by the addition of organic ferroelectric layer.4. HfAlO ferroelectric films can also improve the performance of the perovskite solar cell, and the ferroelectric layer did not polarized. The stability of the solar cell can be greatly enhanced by the addition of HfAlO.