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WITHDRAWN - EN15.09.05 : Vis-Near Infrared Photodetectors Based on Methyl Ammonium Lead Iodide Thin Films by Pulsed Laser Deposition

5:00 PM–7:00 PM Apr 5, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E

Description
Nagabhushan Patel1 Sandra Dias1 S.B. Krupanidhi1

1, Indian Institute of Science, Bangalore, KA, India

Organic-inorganic hybrid perovskite materials are considered as promising candidates for emerging thin-film photodetectors. In this work we discussed the application of the CH3NH3PbI3 thin films by pulsed laser deposition for photo detection applications. With this method we obtained high perovskite film coverage on FTO substrate and observed well formed grains. The films did not show any sign of degradation over months together.
We investigated the surface morphology and surface roughness of the films by field emission scanning electron microscope and atomic force microscope. We studied the optical responses of the films. Photoluminescence (PL) spectra was observed for all films which were grown at different deposition and annealing time durations, and the PL peak was found at 1.61 eV, 1.61eV, 1.6 eV and 1.62 eV respectively. Also, UV-Visible spectra has been observed for all the samples and band gap was found at 1.55 eV, 1.52 eV, 1.57 eV and 1.6 eV respectively. We also studied time resolved PL spectrum for all the samples and found that the decay time constant was increasing with time.
We carried out a study on solar and infrared photodetection using CH3NH3PbI3 thin films. The values of the responsivity, sensitivity, external quantum efficiency and specific detectivity under 1 sun illumination and 0.7 V bias were 105.4 A/W, 1.9, 238% and 1.5 × 1012 Jones respectively.

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