Hydrogenated TiO2 as efficient electron transport layer of planar perovskite solar cell

College of Physics, Optoelectronics and Energy, Jiangsu Key Laboratory of Thin Films, Center for Energy Conversion Materials & Physics (CECMP), Soochow University, Suzhou 215006, P. R. China

Adv. Mater. Lett., 2018, 9 (6), pp 419-425

DOI: 10.5185/amlett.2018.1944

Publication Date (Web): May 17, 2018

Copyright © IAAM-VBRI Press

E-mail: lli@suda.edu.cn

Abstract

The electron transport material has the great effect on the performance of hybrid perovskite solar cells. TiO₂ is widely chosen as the electron transport layer due to its facile synthesis and excellent charge extraction capability. Here, for the first time, we utilize the hydrogen treated TiO₂ as the electron transport layer for improving the performance of perovskite solar cells. The hydrogen treatment increases the Fermi level and conductivity of TiO₂, and the device based on hydrogen treated TiO₂ exhibits a power conversion efficiency of 13.15% compared with 9.45% for the reference device with untreated TiO₂. The results highlight the importance of optimizing the electron transport material and provide a new route to fabricate highly efficient planar perovskite solar cells.

Keywords

Electron transport layer, hydrogen treatment, TiO₂, perovskite, atomic layer deposition.