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14 September 2018 Novel fabrication of flexible perovskite photosensor using capillary motion
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Flexible sensors offer advantages such as light weight, cost effective, the potential to be manufactured with roll-to-roll equipment and to be used in portable and wearable devices. To remain as a cost-effective device, there is a need to reduce fabrication process expenses while preserving high sensitivity and responsivity. In this paper we demonstrate a novel method for facile fabrication of lead halide perovskite photosensor on a flexible substrate with high sensitivity. Capillary motion of perovskite precursor was employed as a convenient and simple technique to create a patterned layer of perovskite. Scanning electron microscope was employed to characterize fabricated perovskite layer. Fabricated layer was used in an ITO-perovskite-ITO structure to be used as a photosensor. Electrical and optical characteristics of the device have been investigated. The responsivity and the sensitivity of the device at 2.0 V were measured to be 0.1 A/W and 172, respectively. Finally, optical properties of the fabricated device were compared with another photodetector fabricated by conventional lithography process. The photocurrent of the sample, made by utilizing capillary motion, at 2.0 V was found to be 211 nA which was 2.8 times higher than the photocurrent of the sample made by traditional method (76 nA at 2.0 V). This novel method has shown great potential for commercial application.
Conference Presentation
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Fatemeh Khorramshahi and Arash Takshi "Novel fabrication of flexible perovskite photosensor using capillary motion", Proc. SPIE 10738, Organic and Hybrid Sensors and Bioelectronics XI, 107380R (14 September 2018);

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