JOURNAL OF MATERIALS AND ELECTRONIC DEVICES

Voltage dependent photocurrent characteristics of Al/PTCDA/p-type Si structures in the light intensity range of 20-100 mW/cm2

2025-09-24T22:46:18+03:00

In this study, The PTCDA solution was coated on the p-Si semiconductor by Spin Coating method to form a very thin film layer. The photoelectric/photovoltaic values of Al/PTCDA/p-type Si structures were investigated in the light intensity range of 20 mW/cm² and 100 mW/cm² using current-voltage measurements. Thus, the fundamental photovoltaic values such as open circuit voltage (V_oc), short circuit current density (J_sc), maximum current density (J_max), maximum voltage (V_max) and maximum power (P_max) were acquired as 0.176 V, 1.057×10⁻³ A/cm², 7.580×10⁻⁴ A/cm², 0.112 V, 8.484x10^-5W; 0.159 V, 4.586×10⁻³ A/cm², 2.700×10⁻³ A/cm², 0.079 V, 2.1584x10^-4W under 20 mW/cm² and 100 mW/cm² light intensity, respectively. According to the obtained results, the experimental results showed that the electrical properties of Al/PTCDA/p-Si structures will improve depending on the light intensity and thus this structure can be developed for photovoltaic applications.

Comparative Sustainability Assessment of Offshore Wind, Wind-Solar Hybrid, and Wave Energy

2025-09-30T16:13:48+03:00

This study presents a comparative analysis of incentive mechanisms for offshore wind energy, wave energy, and hybrid renewable systems in Türkiye, focusing on their sustainability implications. The incentive amounts for these three energy types have been calculated in both Turkish Lira (kuruş/kWh) and US Dollars (cents/kWh). The analysis period spans from January 2021 (when the incentive scheme was initiated) to June 2025. Through this timeframe, it conducted a comprehensive comparison among the considered energy sources to determine which offers the most advantageous conditions for investors and sustainable development. The analysis reveals that the cumulative incentive amounts required for these three energy types are calculated at 1044.84, 906.8, and 979.52 cents USD/kWh for offshore wind, wind-solar hybrid, and wave energy systems, respectively. When facility costs are excluded from consideration, offshore wind energy emerges as the most advantageous option. Furthermore, the distribution of incentive allocations among these renewable technologies shows that offshore wind energy accounts for 36% of total support, followed by wave/current energy at 33%, and wind-solar hybrid systems at 31%, demonstrating a balanced yet strategically differentiated approach to renewable energy promotion in Türkiye.

Three-Dimensional Design of a Robotic Hand with Proximal and Distal Interphalangeal Joints

2025-09-30T16:41:54+03:00

The human hand, with its intricate joint architecture and high dexterity, is one of the most compelling exemplars of biomechanical systems. In recent years, biomimetic approaches in robotic hand design have gained prominence, aiming to reproduce human-like motion for industrial manipulation, prosthetics, and rehabilitation. However, many existing studies model the metacarpophalangeal (MCP) joints while giving insufficient attention to the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints. In this study, inspired by the biomechanics of the human hand, it is presented a three-dimensional robotic hand that explicitly incorporates the PIP and DIP joints. Using SolidWorks, It has been modelled finger joints, phalangeal structures, and motion constraints in detail. The resulting model more faithfully reproduces physiological ranges of motion, yielding a representation that is closer to natural hand kinematics. This work provides a foundation for subsequent development of control algorithms and physical prototyping, and underscores the importance of biomimetic design in robotic hands.