Low temperature-processed ZnO nanorods-TiO2 nanoparticles composite as electron 
transporting layer for perovskite solar cells

Garcia, V.J.; Pelicano, Christian Mark; Yanagi, H.

doi:10.1016/j.tsf.2018.07.039

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Low temperature-processed ZnO nanorods-TiO2 nanoparticles composite as electron transporting layer for perovskite solar cells

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Garcia, V., Pelicano, C. M., & Yanagi, H. (2018). Low temperature-processed ZnO nanorods-TiO2 nanoparticles composite as electron transporting layer for perovskite solar cells. Thin Solid Films, 662, 70-75. doi:10.1016/j.tsf.2018.07.039.

Cite as: https://hdl.handle.net/21.11116/0000-0010-0F72-E

Abstract

Electron transport is one of the most crucial processes that determine charge collection efficiency in perovskite solar cells. Herein, a low temperature-processed ZnO-TiO2 nanocomposite is developed as an electron transporting layer for perovskite solar cells. Highly-crystalline ZnO nanorods were deposited electrochemically which served as the scaffold for spin-coated TiO2 nanoparticles. This ZnO-TiO2 nanocomposite is designed to integrate the fast electron transport along the nanorods and the additional surface area provided by the nanoparticles for enhanced electronic contact between the electron-transporting layer and the perovskite layer. A weak photoluminescence quenching behavior was observed for ZnO nanorods after TiO2 nanoparticle coating which signifies a reduction in ZnO surface defects. Steady-state photoluminescence and optical absorption measurements indicated improved charge transfer and higher absorption of light, respectively, when ZnO-TiO2 nanocomposite is contacted with the CH3NH3PbI3 layer. However, the clustering of the nanoparticles caused inefficient charge transfer from TiO2 to ZnO.