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Interdigital Photodetector with stabilized α-phase CsPbI3 using polyethylene oxide

Published online by Cambridge University Press:  23 June 2020

Haider Salman ,
Amir Shariffar ,
Tanveer A. Siddique  and
M. O. Manasreh
Haider Salman
Affiliation:
Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
Amir Shariffar
Affiliation:
Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
Tanveer A. Siddique
Affiliation:
Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
M. O. Manasreh
Affiliation:
Department of Electrical Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
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Abstract

Inorganic perovskite photodetector with chromium interdigitated electrodes is investigated. The active material is a solution processed CsPbI3 synthesized by one step deposition. The α-phase of this material is unstable at room temperature and it converts to the δ-phase at temperatures below 320°C. The stabilization of the α-phase was conducted in nitrogen environment by adding 5% weight ratio of polyethylene oxide to the equimolar mixture of PbI2 and CsI in dimethyl sulfoxide. The absorbance spectrum of the CsPbI3 with polyethylene oxide showed the emergence of a second peak at ∼ 690 nm related to the α-phase in addition to the peak at 420 nm of the δ phase. The peak in the visible range was also observed in the μ-photoluminescence spectrum at 690 nm. The interdigital structure was prepared by photolithography method to deposit 80 nm of chromium interdigitated electrodes on glass substrate with 10 μm channel width. The detector's on/off ratio and the detectivity were calculated from the current voltage curve under 100 mW/cm2 to be 9.64×103 and 9.2×109 Jones respectively.

Type
Articles
Information
MRS Advances , Volume 5 , Issue 50: Energy, Storage and Conversion , 2020 , pp. 2537 - 2543
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Copyright
Copyright © Materials Research Society 2020

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