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TiO2 Phase Junction Electron Transport Layer Boosts Efficiency of Planar Perovskite Solar Cells.

ABSTRACT: In the planar perovskite solar cells (PSCs), the electron transport layer (ETL) plays a critical role in electron extraction and transport. Widely utilized TiO2 ETLs suffer from the low conductivity and high surface defect density. To address these problems, for the first time, two types of ETLs based on TiO2 phase junction are designed and fabricated distributed in the opposite space, namely anatase/rutile and rutile/anatase. The champion efficiency of PSCs based on phase junction ETL is over 15%, which is much higher than that of cells with single anatase (9.8%) and rutile (11.8%) TiO2 as ETL. The phase junction based PSCs also demonstrated obviously reduced hysteresis. The enhanced performance is discussed and mainly ascribed to the excellent capability of carrier extraction, defect passivation, and reduced recombination at the ETL/perovskite interface. This work opens a new phase junction ETL strategy toward interfacial energy band manipulation for improved PSC performance.

SUBMITTER: Zhu Y 

PROVIDER: S-EPMC5867052 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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TiO<sub>2</sub> Phase Junction Electron Transport Layer Boosts Efficiency of Planar Perovskite Solar Cells.

Zhu Yayun Y   Deng Kaimo K   Sun Haoxuan H   Gu Bangkai B   Lu Hao H   Cao Fengren F   Xiong Jie J   Li Liang L  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20180106 3

In the planar perovskite solar cells (PSCs), the electron transport layer (ETL) plays a critical role in electron extraction and transport. Widely utilized TiO<sub>2</sub> ETLs suffer from the low conductivity and high surface defect density. To address these problems, for the first time, two types of ETLs based on TiO<sub>2</sub> phase junction are designed and fabricated distributed in the opposite space, namely anatase/rutile and rutile/anatase. The champion efficiency of PSCs based on phase  ...[more]

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