Effect of illumination and frequency dependent series resistance and interface state densities on the electrical properties of DNA-CTMA/p-GaN bio-hybrid Schottky photodiode |
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| Institution: | 1. LED-IT Fusion Technology Research Center, Yeungnam University, Gyeongsan 38541, Republic of Korea;2. Department of Mechanical Engineering, Chadalawada Ramanamma Engineering College, Tirupati 517-506, India;3. School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;1. Institute of Continuous Media Mechanics UB RAS, Perm, Russian Federation;2. Perm State National Research University, Perm, Russian Federation;3. Leibniz Institute of Polymer Research Dresden, D-01069 Dresden, Germany;1. Department of Mechanical Engineering, Materials Technology Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;2. SABIC Innovative Plastics B.V., P.O. Box 117, 4600 AC Bergen op Zoom, The Netherlands;1. Institute of Building Construction and Technology, TU Wien, Karlsplatz 13/206-4, 1040 Vienna, Austria;2. Department of Orthopaedic Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria;3. Department of Mechanical Engineering, The University of Memphis, Memphis, TN 38152, USA;4. Institute of Solid State Physics, TU Wien, Karlsplatz 13/138-4, 1040 Vienna, Austria |
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| Abstract: | A deoxyribonucleic acid-cetyltrimethylammonium chloride (DNA-CTMA) biopolymer-based inorganic p-type GaN bio-hybrid Schottky photodiode was fabricated and its electrical characteristics were studied. The Al/Cr/DNA-CTMA/p-GaN bio-hybrid photodiode parameters were investigated using current-voltage (I-V), capacitance-voltage-frequency (C-V-f) and conductance-voltage-frequency (G/ω-V-f) measurements. The calculated ideality factor and barrier height of the diode were found to be 1.8 and 0.82 eV, respectively. The electrical and photo-conduction properties of the diode were examined using dark I-V and steady-state photoconductivity techniques. The C-V-f and G/ω-V-f measurements showed that the capacitance and conductance of the diode depends on the bias voltage and frequency, respectively. On the other hand, a decrease in capacitance and increase in conductance with increasing frequency at room temperature were demonstrated based on the interface state density. In addition, the interface state density decreased exponentially with increasing frequency. It is also noted that series resistance decreased with increasing frequency. The results showed that the biopolymer-based Al/Cr/DNA-CTMA/p-GaN bio-hybrid photodiode can be used as a photosensor in optical applications and the development of high-performance organic-inorganic-based p-Schottky diodes that are environmentally safe. |
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| Keywords: | p-Schottky diode Bio-hybrid photodiode Steady-state photocurrent |
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