Browsing by Author "Napoleonov, Blagovest"

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Atomic Layer-Deposited Al-Doped ZnO Thin Films for Display Applications
(2020-06-01)
Dimitrov, Dimitre
;
Tsai, Che-Liang
;
Petrov, Stefan
;
Marinova, Vera
;
Petrova, Dimitrina
The integration of high uniformity, conformal and compact transparent conductive layers into next generation indium tin oxide (ITO)-free optoelectronics, including wearable and bendable structures, is a huge challenge. In this study, we demonstrate the transparent and conductive functionality of aluminum-doped zinc oxide (AZO) thin films deposited on glass as well as on polyethylene terephthalate (PET) flexible substrates by using an atomic layer deposition (ALD) technique. AZO thin films possess high optical transmittance at visible and near-infrared spectral range and electrical properties competitive to commercial ITO layers. AZO layers deposited on flexible PET substrates demonstrate stable sheet resistance over 1000 bending cycles. Based on the performed optical and electrical characterizations, several applications of ALD AZO as transparent conductive layers are shown-AZO/glass-supported liquid crystal (LC) display and AZO/PET-based flexible polymer-dispersed liquid crystal (PDLC) devices.
Single and Multilayer Graphene Grown by CVD Technique: Characterization for Electro-optical Applications
(2019-01-01)
Fidanova, Tsvetelina
;
Petrov, Stefan
;
Napoleonov, Blagovest
;
Marinova, Vera
;
Petrova, Dimitrina
In this paper we demonstrate graphene growth by using Chemical Vapor Deposition (CVD) method. Single layer graphene was produced by a low pressure CVD method and multilayer graphtme by an atmospheric pressure CVD method. The graphene quality and number of layers were evaluated by Raman analysis and optical transmittance measurements.