Amorphous Metal Oxide Blocking Layers for Highly Efficient Low-Temperature Brookite TiO2-Based Perovskite Solar Cells
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Updated: Feb 16, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Atsushi Kogo1,2, Yoshitaka Sanehira2, Youhei Numata2
1National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Abstract:
A fully low-temperature-processed perovskite solar cell was fabricated with an ultrathin amorphous TiOx hole-blocking layer in combination with brookite TiO2 prepared at temperature <150 °C. Structured with TiOx/brookite TiO2 bilayer electron collector, the perovskite solar cells exhibit high efficiency up to 21.6% being supported by high open-circuit voltage and fill factor up to 1.18 V and 0.83, respectively. Compared to SnOx hole-blocking layer, TiOx has better electron band alignment with brookite TiO2 and hence, results in higher efficiency.
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