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Defective TiO2 with high photoconductive gain for efficient and stable planar heterojunction perovskite solar cells.


ABSTRACT: Formation of planar heterojunction perovskite solar cells exhibiting both high efficiency and stability under continuous operation remains a challenge. Here, we show this can be achieved by using a defective TiO2 thin film as the electron transport layer. TiO2 layers with native defects are deposited by electron beam evaporation in an oxygen-deficient environment. Deep-level hole traps are introduced in the TiO2 layers and contribute to a high photoconductive gain and reduced photocatalytic activity. The high photoconductivity of the TiO2 electron transport layer leads to improved efficiency for the fabricated planar devices. A maximum power conversion efficiency of 19.0% and an average PCE of 17.5% are achieved. In addition, the reduced photocatalytic activity of the TiO2 layer leads to enhanced long-term stability for the planar devices. Under continuous operation near the maximum power point, an efficiency of over 15.4% is demonstrated for 100?h.

SUBMITTER: Li Y 

PROVIDER: S-EPMC4992141 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

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Defective TiO2 with high photoconductive gain for efficient and stable planar heterojunction perovskite solar cells.

Li Yanbo Y   Cooper Jason K JK   Liu Wenjun W   Sutter-Fella Carolin M CM   Amani Matin M   Beeman Jeffrey W JW   Javey Ali A   Ager Joel W JW   Liu Yi Y   Toma Francesca M FM   Sharp Ian D ID  

Nature communications 20160818


Formation of planar heterojunction perovskite solar cells exhibiting both high efficiency and stability under continuous operation remains a challenge. Here, we show this can be achieved by using a defective TiO2 thin film as the electron transport layer. TiO2 layers with native defects are deposited by electron beam evaporation in an oxygen-deficient environment. Deep-level hole traps are introduced in the TiO2 layers and contribute to a high photoconductive gain and reduced photocatalytic acti  ...[more]

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