Origin of Extended UV Stability of 2D Atomic Layer Titania-Based Perovskite Solar Cells Unveiled by Ultrafast Spectroscopy

Anusha Puliparambil Thilakan, Jia Xing Li, Tzu Pei Chen, Shao Sian Li, Chun Wei Chen, Minoru Osada, Kazuhito Tsukagoshi, Takayoshi Sasaki, Atsushi Yabushita, Kaung Hsiung Wu, Chih Wei Luo

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4 引文 斯高帕斯(Scopus)

摘要

The inherent instability of UV-induced degradation in TiO2-based perovskite solar cells was largely improved by replacing the anatase-phase compact TiO2 layer with an atomic sheet transport layer (ASTL) of two-dimensional (2D) Ti1-δO2. The vital role of microscopic carrier dynamics that govern the UV stability of perovskite solar cells was comprehensively examined in this work by performing time-resolved pump-probe spectroscopy. In conventional perovskite solar cells, the presence of a UV-active oxygen vacancy in compact TiO2 prohibits current generation by heavily trapping electrons after UV degradation. Conversely, the dominant vacancy type in the 2D Ti1-δO2 ASTL is a titanium vacancy, which is a shallow acceptor and is not UV-sensitive. Therefore, it significantly suppresses carrier recombination and extends UV stability in perovskite solar cells with a 2D Ti1-δO2 ASTL. Other carrier dynamics, such as electron diffusion, electron injection, and hot hole transfer processes, were found to be less affected by UV irradiation. Quantitative pump-probe data clearly show a correlation between the carrier dynamics and UV aging of perovskite solar cells, thus providing a profound insight into the factors driving UV-induced degradation in perovskite solar cells and the origin of its performance.

原文英語
頁(從 - 到)21473-21480
頁數8
期刊ACS Applied Materials and Interfaces
11
發行號24
DOIs
出版狀態已發佈 - 6月 19 2019

ASJC Scopus subject areas

  • 材料科學(全部)

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