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Investigation on Transition Diode Properties of rGO‐GO/n‐Si Heterojunction
Author(s) -
Abdullah Mohd Faizol,
Abd Rahman Shaharin Fadzli,
Hashim Abdul Manaf
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900064
Subject(s) - materials science , annealing (glass) , equivalent series resistance , schottky diode , schottky barrier , raman spectroscopy , graphene , diode , heterojunction , conductivity , optoelectronics , thermal conduction , atmospheric temperature range , work function , rectification , nanotechnology , voltage , chemistry , composite material , electrical engineering , optics , physics , layer (electronics) , meteorology , engineering
Thermal annealing in the range of 100–700 °C is applied to reduce the graphene oxide (GO) film into reduced‐GO (rGO). Raman spectrum analysis and film conductivity analysis via Hall measurement confirms the advancement of reduction degree at higher annealing temperature (AT). The film conductivity is 19.7 S cm −1 after annealing at 700 °C. Hall measurement also reveals the sudden appearance of electron conduction around 300 °C. The type of attached oxygen functional groups determines the type of majority carrier in the film and modulate the work function of conductive crystalline sp 2 carbon. Then, the effect of AT to the current‐voltage characteristics of n‐type silicon/GO junction are discussed. The fabricated junction is analyzed based on Schottky junction operation using Rhoderick and Cheung methods. The higher reduction degree leads to lower series resistance. Schottky barrier height is found to increase to 0.92 eV for AT around 300 °C, before it decreases at higher AT. Correlation between the barrier height and the hole concentration from Hall measurement can be noticed. Schottky junction with AT of 400 °C gives the highest rectification ratio of 149, owing to moderate value of series resistance as well as high barrier height.