Perovskite oxide SrTiO3 as an efficient electron transporter for hybrid perovskite solar cells

Perovskite oxide SrTiO3 as an efficient electron transporter for hybrid perovskite solar cells

Perovskite oxide SrTiO3 as an efficient electron transporter for hybrid perovskite solar cells
Ashok Bera, Kewei Wu, Arif Sheikh, Erkki Alarousu, Omar F. Mohammed, and Tom Wu
J. Phys. Chem. C, 118 (49), pp 28494–28501, (2014)
Ashok Bera, Kewei Wu, Arif Sheikh, Erkki Alarousu, Omar F. Mohammed, and Tom Wu
Solar cell, Perovskite, SrTiO3, Electron transport layer, Transient absorption spectroscopy
2014
In this work, we explored perovskite oxide SrTiO3 (STO) for the first time as the electron-transporting layer in organolead trihalide perovskite solar cells. The steady-state photoluminescence (PL) quenching and transient absorption experiments revealed efficient photoelectron transfer from CH3NH3PbI3-xClx to STO. Perovskite solar cells with meso-STO exhibit an open circuit voltage of 1.01 V, which is 25% higher than the value of 0.81 V achieved in the control device with the conventional meso-TiO2. In addition, an increase of 17% in the fill factor was achieved by tailoring the thickness of the meso-STO layer. We found that the application of STO leads to uniform perovskite layers with large grains and complete surface coverage, leading to a high shunt resistance and improved performance. These findings suggest STO as a competitive candidate as electron transport material in organometal perovskite solar cells.




DOI: 10.1021/jp509753p