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    Electroforming of thin film silicon based homojunction pin diode
    (Springer, 2012) Anutgan, M.; Anutgan, T.; Atilgan, I.; Katircioglu, B.
    The recent observations of bright visible electroluminescence (EL) from electroformed thin film silicon based wide-gap alloys are further clamped down in a simpler structure. For this purpose, a standard quality, ordinary hydrogenated amorphous silicon (a-Si:H) homojunction pin diode was fabricated by plasma enhanced chemical vapor deposition. The fresh diode was characterized by temperature scanned current-voltage (I-V) and constant photocurrent measurements. The energy distribution of density of states within the forbidden gap of the intrinsic a-Si:H layer was determined by space charge limited current and optical absorption spectroscopies. Then the diode was intentionally subjected to a sufficiently high, calibrated electric field leading to its Joule heating assisted rapid crystallization at ambient atmosphere. The fresh and the formed diodes exhibit different I-V and EL characteristics. The current density of the formed diode increases drastically at low voltages while remaining unchanged at high voltages when compared to that of the fresh diode. Parallelly, the room temperature EL intensity under a particular current stress is boosted with electroforming. These interesting phenomena have been discussed in the frame of a self-consistent model.
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    Estimation of glucose concentration in solution using near infrared spectroscopy and artificial neural network
    (Institute of Electrical and Electronics Engineers Inc., 2016) Gulderen, A.; Anutgan, T.; Anutgan, M.
    In this work, analysis of spectra with artificial neural network (ANN) and estimation of glucose concentration from the spectrum is aimed by using near infrared spectroscopy (NIR) method. For this purpose, samples of different concentrations obtained by mixing pure water with glucose monohydrate, which was measured via precision scale, and then NIR spectrum of each sample was extracted. Spectral data and concentration values were transferred to MATLAB platform. ANN analysis was conducted after the required signal processing steps. Experimental results are promising in the determination of glucose concentration of any solution by this method including blood sugar. © 2016 IEEE.
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    Transport and luminescence phenomena in electroformed silicon nitride-based light emitting diode
    (Taylor & Francis Ltd, 2013) Anutgan, M.; Anutgan, T.; Atilgan, I.; Katircioglu, B.
    Hydrogenated amorphous silicon nitride-based heterojunction pin diode was electroformed under sufficiently high forward bias stress leading to its instant nanocrystallization at room temperature. In order to investigate the origin of the accompanying bright visible light emission, current-voltage and electroluminescence (EL) characteristics of the electroformed diode were scanned over temperature. Electrical transport mechanism was analysed in the low, medium and high electric field regimes. Temperature and field dependence of thermal activation energy were discussed. EL characteristics were studied using the spectral energy distribution and the injection current dependence of its intensity. Thermal quenching data of EL and photoluminescence intensities were compared. Finally, the relationship between the electrical transport and luminescence phenomena was attempted to be interpreted within the frame of a self-consistent model.