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

Bera, Ashok; Wu, Kewei; Sheikh, Arif D.; Alarousu, Erkki; Mohammed, Omar F.; Wu, Tao

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

Type

Article

Authors

Bera, Ashok

Wu, Kewei
Sheikh, Arif D.

Alarousu, Erkki
Mohammed, Omar F.

Wu, Tao

KAUST Department

Chemical Science Program
KAUST Solar Center (KSC)
Laboratory of Nano Oxides for Sustainable Energy
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group

Online Publication Date

2014-12-02

Print Publication Date

2014-12-11

Date

2014-12-02

Abstract

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.

Citation

Bera, A., Wu, K., Sheikh, A., Alarousu, E., Mohammed, O. F., & Wu, T. (2014). Perovskite Oxide SrTiO3as an Efficient Electron Transporter for Hybrid Perovskite Solar Cells. The Journal of Physical Chemistry C, 118(49), 28494–28501. doi:10.1021/jp509753p

Acknowledgements

Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST).