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Stability of Halide Perovskite Solar Cell Devices: In Situ Observation of Oxygen Diffusion under Biasing

Technical staff member Hee Joon Jung and NUANCE Center Director Professor Vinayak P. Dravid were involved in a recent project involving perovskite solar cells.

There has been considerable interest in organic–inorganic hybrid perovskite solar cells for photovoltaic purposes as a result of improvements in power conversion efficiencies over the past several years. However, the poor long-term stability of perovskite solar cells has been an obstacle to their commercial applications. This publication reports that oxygen, released by a TiO2 electron-transporting layer, is responsible for structural transformation in perovskite.

“The material itself produces very high efficiency solar cells, but the only drawback is long term stability,” explained technical staff member Hee Joon Jung. “We figured out that oxygen from tio2 is degrading halide perovskite solar cells. Therefore, researchers should not use TiO2 or non-oxide which are popularly used in this solar cell structure. This will enhance the long term stability of halide perovskite solar cell.”

This study made use of the EPIC facility of the NUANCE Center. Support for NUANCE Center was given by the SHyNE Resource, the MRSEC Program, and the International Institute of Nanotechnology (IIN), as well as several other benefactors. The full publication can be read here.

 

Figures from the publication showing perovskite solar cells and stacking faults.