The optimal electron transport layer is a prerequisite for achieving high power conversion efficiency of perovskite solar cells because electron transport and recombination are mainly governed at the interfaces of the devices. Tin(IV) oxide (SnO2) which has been regarded as an excellent electron transporting material serves many advantages such as low defect concentration, high electrical conductivity and low fabrication temperature. However, the low conduction band edge of SnO2 generally leads to limited built-in potential of the corresponding devices that would limit its full potential in high performance perovskite solar cells. Herein, we demonstrate an organic-inorganic double electron transporting layers by using [6,6]-Phenyl C61 butyric acid methyl ester (PCBM) to improve not only energy level alignments but also the electrical properties of pristine SnO2 in perovskite solar cells. The optimal double electron transporting layer leaded to optimized band alignment, improved charge transport and reduced charge recombination with a substantial increase of device efficiency for 2-dimensional ruddlesden-popper perovskite solar cells from 5.56% to 7.02%. Details in optical, electrical, and device analyses will be presented.

Organic–inorganic electron transport layer for enhancing efficiency and stability of 2-dimensional ruddlesden-popper perovskite solar cells

2019 Fall National Meeting

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