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Issue 40, 2017
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An air-stable ultraviolet photodetector based on mesoporous TiO2/spiro-OMeTAD

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Abstract

A hybrid organic/inorganic heterojunction structured photodetector has attracted much attention due to its high device stability and ease of fabrication. In this work, an ultraviolet photodetector with the configuration of spiro-OMeTAD/mesoporous TiO2/compact TiO2 was developed. The small molecule of spiro-OMeTAD was introduced as the active layer, owing to its fast response to the ultraviolet light and high glass transition temperature (Tg). The mesoporous TiO2 layer with a large specific area could accelerate the interface separation of electrons and holes, while the compact TiO2 layer was used to block the charge leakage between FTO and spiro-OMeTAD. With a 100 nm TiO2 mesoporous layer, the photodetector displayed a fast response time (<0.02 s), a low dark current density (8.79 nA cm−2) and a high detectivity (3.5 × 1013 Jones) at 340 nm light wavelength and a 0.60 V voltage output. Besides, the unencapsulated device in air also showed excellent long-term stability (∼2 months) and thermal stability (∼100 °C).

Graphical abstract: An air-stable ultraviolet photodetector based on mesoporous TiO2/spiro-OMeTAD

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Publication details

The article was received on 22 Jun 2017, accepted on 19 Sep 2017 and first published on 20 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC02787G
Citation: J. Mater. Chem. C, 2017,5, 10543-10548
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    An air-stable ultraviolet photodetector based on mesoporous TiO2/spiro-OMeTAD

    H. Bai, T. Shen and J. Tian, J. Mater. Chem. C, 2017, 5, 10543
    DOI: 10.1039/C7TC02787G

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