Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
All-inorganic cesium lead halide (CsPbX3) perovskite shows great potential for photovoltaic applications due to its superior solar cell performance and thermal stability compared to traditional organic–inorganic hybrid perovskite materials. Here, we report CsPbIBr2 perovskite solar cells with MgO coated mesoporous TiO2 (mp-TiO2) based electron transporting layer (ETL) between CsPbIBr2 and blocking TiO2 (bl-TiO2). MgO is coated directly onto mp-TiO2 by a simple spin-coating process of magnesium acetate solution. It is found that MgO coating can shift the work function of the ETL upward by 0.2 eV and decrease the resistivity of mp-TiO2 layer. The elevated conduction band minimum (CBM) contributes to the increase of the VOC. The upshifted CBM of mp-TiO2 layer is more compatible with the CsPbIBr2 layer, which yields a better JSC and FF by reducing the energy loss and facilitating the photogenerated electron transporting from perovskite to mp-TiO2. As a result, the optimized CsPbIBr2 perovskite solar cells with MgO coated mp-TiO2 as ETL exhibited higher power conversion efficiency of 5.39% (VOC=0.90V, JSC=8.43mA/cm2, FF=70.74%) under AM1.5G illumination in comparison to the 4.13% (VOC=0.83V, JSC=7.69mA/cm2, FF=64.77%) of the CsPbIBr2 perovskite solar cells with pure mp-TiO2. This work presents a new simple method to improve the performance of the perovskite solar cells based on mp-TiO2 ETL.
This work was supported by the DGIST R&D Program of the Ministry of Science, ICT and Future Planning of Korea (18-ET-01).
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