Amorphous Metal Oxide Blocking Layers for Highly Efficient Low-Temperature Brookite TiO2-Based Perovskite Solar Cells

Atsushi Kogo; Yoshitaka Sanehira; Youhei Numata; Masashi Ikegami; Tsutomu Miyasaka

doi:10.1021/acsami.7b16662

Amorphous Metal Oxide Blocking Layers for Highly Efficient Low-Temperature Brookite TiO₂-Based Perovskite Solar Cells

ACS Appl Mater Interfaces. 2018 Jan 24;10(3):2224-2229. doi: 10.1021/acsami.7b16662. Epub 2018 Jan 8.

Authors

Atsushi Kogo^{1

2}, Yoshitaka Sanehira², Youhei Numata², Masashi Ikegami², Tsutomu Miyasaka²

Affiliations

¹ National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
² Graduate School of Engineering, Toin University of Yokohama , 1614 Kurogane-cho, Aoba, Yokohama, Kanagawa 225-8503, Japan.

PMID: 29299921
DOI: 10.1021/acsami.7b16662

Abstract

A fully low-temperature-processed perovskite solar cell was fabricated with an ultrathin amorphous TiO_x hole-blocking layer in combination with brookite TiO₂ prepared at temperature <150 °C. Structured with TiO_x/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 SnO_x hole-blocking layer, TiO_x has better electron band alignment with brookite TiO₂ and hence, results in higher efficiency.

Keywords: amorphous; brookite TiO2; low-temperature process; metal oxide electron collector; perovskite solar cells.