Date of Graduation

5-2021

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering (MSEE)

Degree Level

Graduate

Department

Electrical Engineering

Advisor/Mentor

Omar Manasreh

Committee Member

Samir M. El-Ghazaly

Second Committee Member

Bothina Manasreh

Third Committee Member

Jeff Dix

Keywords

perovskite, optoelectronics, nanoparticles

Abstract

In this thesis, photodetector based on the zinc oxide and cesium lead bromide hetero structure were fabricated and characterized. Zinc oxide (ZnO) nanoparticles were synthesized using solution processing and cesium lead bromide (CsPbBr3) thin film was synthesized using two step deposition method. Three phonon modes were obtained by the Raman spectroscopy of ZnO nanoparticles. X-ray diffraction spectra of ZnO exhibits five exciton peaks which denotes that the synthesized ZnO structure was of good crystallinity with wurtzite hexagonal phase. The absorbance spectrum of ZnO shows the bandgap (Eg) in the order of 3.5 eV that aligns with reported results. The photoluminescence and the absorbance technique were used to measure the Eg of CsPbBr3 in the order of 2.33 eV and 2.37 eV respectively which means the results are in good agreement. The current voltage (I-V) graph exhibits that due to the electron transfer from CsPbBr3 to ZnO under illuminated light, the photocurrent was increased by a factor 2 greater than the dark current under the bias voltage of 6 V. Impulse time response of the photodetector was observed by measuring the current under light on and light off condition with an interval of 10 seconds. The photodetector was fabricated using the conventional wet etching lithography. Interdigital metallization structures were used with Au electrodes having 10µm gaps. The detectivity of the photodetector was measured to be 3.8 × 1011 cm / Hz2 W from the I-V measurement. Under 10 µW light illumination the device showed good photo responsivity of 14.99 A/W. The fabricated photo detectors demonstrated excellent stability. This project explains that ZnO/CsPbBr3 hetero structure is a promising candidate for high performance photodetector.

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