Synthesis and characterization of p-GaSe thin films and the analyses of I-V and C-V measurements of p-GaSe/p-Si heterojunction under electron irradiation

gur, emre/0000-0002-3606-2751WOS: 000415686200011Gallium Selenide (GaSe) thin films were grown by the electrochemical deposition (ECD) technique on Indium tin oxide (ITO) and p-Si (100) substrates. The Electron paramagnetic resonance (EPR) spectrum of GaSe thin films' growth on ITO was recorded at room temperature. According to EPR results, the g value of an EPR signal obtained for GaSe deposited on ITO is 2.0012 +/- 0.0005. In/GaSe/p-Si heterojunction was irradiated with high-energy (6MeV) and low-dose (1.53x10(10)e(-)cm(-2)) electrons. The ideality factor of the In/GaSe/p-Si device was calculated as 1.24 and barrier height was determined as 0.82eV from I-V measurements before irradiation. Acceptor concentration, built-in potential and barrier height of the In/GaSe/p-Si device were also obtained as 0.72x10(14)cm(-3), 0.65eV and 0.97eV from C-V measurements, respectively. After irradiation, the ideality factor n and barrier height phi(b) values of the In/GaSe/p-Si device were calculated as 1.55 and 0.781eV, respectively. Acceptor concentration, the built-in potential and barrier height values of the In/GaSe/p-Si device have also shown a decrease after 6MeV electron irradiation. This change in heterojunction device parameters shows that current transport does not obey thermionic emission, and thus tunneling could be active due to the defects formed by irradiation at the In-GaSe interface

Evaluation of Patients with Behcet's Disease Presenting with Pulmonary Symptoms

Objective: Behcet's disease (BD) is a multisystem disorder and survival depends on pulmonary involvement, especially pulmonary artery aneurysm. Therefore early diagnosis and treatment of pulmonary involvement are very important. This study was conducted to evaluate clinical features, treatment results and outcome of patients with BD presenting with pulmonary symptoms. Material and Methods: Medical records of patients diagnosed as BD over a 17-years period from 1991 to 2008 who presented with pulmonary symptoms in two different chest clinics were reviewed retrospectively. Clinical and radiological findings, treatment and follow-up results were investigated. Results: Twenty-two patients (19 males, three females) diagnosed with BD were included. The mean age was 35.4 years. Sixteen of the patients (72.7%) were diagnosed with BD at chest clinics for first time. Main presenting pulmonary symptom was hemoptysis (72.7%) and six of them (27.3%) had massive hemoptysis. Thirteen patients (59%) had pulmonary artery aneurysms, five of them also had thrombosis within the aneurysm. Nineteen patients (86%) were administered immunosupressive therapy. Eighteen (81.8%) of the patients were followed, median follow-up time was four years. Thirteen patients responded to immunosuppressive therapy. Three patients (16.7%) died, two of them with massive hemoptysis. Conclusion: BD should be kept in mind in differential diagnosis of hemoptysis in young patients, especially in countries with high incidence of BD. Early diagnosis and aggressive treatment for pulmonary involvement can prevent a fatal outcome