يسر اللجنة العلمية بقسم الفيزياء دعوتكم لحضورالندوة العلمية الثالثة لهذا العام الدراسي 1436/1437هـ . والتي سيقدمها مشكوراً هذا الأسبوع د.عبدالرحمن البدري، الباحث في المركز الوطني لتقنية النانو في مدينة الملك عبدالعزيز للعلوم والتقنية (كاكست).
(تجدون أدناه نبذه عن السيرة الذاتية لمقدم الندوة)
عنوان الندوة هو:
"تطوير الخلايا الشمسية المرنة ذات الكفاءة العالية"
"Development of high efficiency flexible solar cells"
(تجدون أدناه ملخص الندوة)
المكان : قاعة رقم (313A-2-34)
الزمان : يوم الثلاثاء القادم 24 محرم 1436هـ الموافق 3 نوفمبر 2015م من الساعة 11:00 إلى الساعة 11:30 صباحاً.
الحضور : كافة منسوبي الجامعة، ونذكر بدعوة طلاب مشاريع التخرج.
مع تحيات اللجنة العلمية بقسم الفيزياء
Abstract:
A flexible solar cell is an attractive concept which provides both material saving and structure flexibility for advanced applications. Thin film exfoliation is achieved by using the controlled spalling technology (CST). The spalling process is implemented by applying a metal stressor to predetermine the fracture thickness, and a handling polyimide tape to assure spalling controllability. This technique was applied for different types of solar cells, mainly single junction InGaAs structure and silicon based HIT structure. First, conventional solar cells were processed and then characterized. The efficiencies of these cells were measured to be 22% and 14%, respectively. To peel off a thin film off the substrate, a Ti/Ni stack was sputtered so it exerts a tensile stress on the underneath substrate. Under specific conditions, a Ni thickness of about 5µm is capable of spalling ~20µm of the desired substrate. The spalled film could be a complete PV structure as the case for the InGaAs cell or a partial structure as the case for the HIT cell. For HIT cells, a PECVD emitter deposition is performed after spalling. A comparison between the bulk structures and the flexible ones will be discussed. In addition, Light current-voltage characteristics and external quantum efficiencies will be presented.
Bio:
Abdulrahman Albadri is an assistant research professor at the national nanotechnology center in King Abdulaziz city for science and technology. He received his PhD from Vanderbilt University, USA in 2005 in the area of radiation effects on solid state electronics. He was as a member of Kacst/IBM nanotechnology center of excellence where he spent two years at IBM Watson research center, New York in 2010 working on the research and development of conventional and flexible solar cells.
