Muhammad Tayyib

Tilleggsinformasjon:

Academic background

Mr. Muhammad Tayyib did his bachelor of Metallurgical and materials engineering from University of Engineering and Technology Lahore, Pakistan in 2007. Then he went to Germany and got master degree in Material science and Engineering from Christian Albrechts Universitat in 2010. In the same year he got a PhD research fellowship at University of Agder, Norway. Untillnow he is working on the degradation of multicrystalline solar cells.

Research experience

During his master he got practical experience by working at different institutes in Germany.  At the start of  his master degree he got a part time researcher job in technical faculity of University Kiel for electrochemical pour etching of Silicon and Germanium semiconductors which lasted about one and half year. In 2009 he worked as an internee at  Fraunhofer Institute of Silicon Technology Itzehoe, (ISiT) Germany. There his most responsibilities were related to febrication and characterization of Acceleration and Radio Frequency (RF) MicroElectroMechanicalSystems (MEMS). In the same year he started his master thesis research on characterization of thin film silicon solar cell at Research centre Juelich, Germany. During his current job he has got well hand on experience on degradation of multicrystalline silicon solar cells.

Prosjekter:

 

Degradation Measurement of the Multicrystalline Solar Cells

The PhD research focuses on the degradation measurement of the multicrystalline solar cells made of Elkem Solar Silicon (ESS) from metallurgical grade route. The research is divided into two main parts. First part consists on the accelerated test in the laboratory while the other part deals with the field testing.

1- Accelerated testing

This research is focused on the main question: in what way will the ESS material degrade differently from the traditional PV material over a life span of 25 to 30 years. Questions of this nature require accelerated test setups to complement field testing. Over the long term, there are two main phenomenon that may cause PV cells to degrades; diffusion and radiation damage. Both phenomena depend again on the operation conditions of the cells. Diffusion of atomic elements within a cell is mainly a function of concentrating gradients and temperature. Radiation damage of the cells is general problem for space application. Humidity can also cause some effect its performance. These tests will be performed individually as well as in the combination. To evaluate the results, current voltage characteristics, Fill Factor, shunt resistance, diffusion length, recombination centre like B-O and Fe complexes concentrations and some other factors would be performed to analyze the degradation effect. Some of the accelerated tests on both kind of solar cells have been performed in collaboration with International Solar Energy Research Centre (ISC) in Konstanz Germany.

2- Field testing

An important aspect of the PV module performance evaluation is the generation of accurate current voltage (I-V) curves and infrared(IR) images from each module at specified time intervals. The I-V curves are used in the calculation of the characteristic performance parameters, that is , open circuit voltage (Voc), short circuit current (Isc) , Fill Factor (FF), maximum power (Pmax), and efficiency (η). Measurement records of these parameters over longer period of time will reveal any trends of material degradation, whether it is short-term degradation where at least 3 years of monitoring is required in order to produce trustworthy indicative data. The field testing is being performed at newly built PV power plant in Hyderabad, India where a large number of PV modules from ESS and polysilicon have been installed and regularly monitored through IV measurements and IR images.

 

Publications

1. Muhammad Tayyib and Tor Oskar Saetre, etl. 'LIGHT AND HEAT INDUCED DEGRADATION STUDY OF ELKEM SOLAR SILICON SOLAR CELLS' Proceeding of 26th European Photovoltaics Conference Hamburg, Germany 5-9 September, 2011
2. Muhammad Tayyib and Tor Oskar Saetre, etl. 'ANALYSIS OF SOME EFFECTS OF POSSIBLE DEVICE DEGRADATION OVER A 30 YEAR LIFESPAN' Proceeding of 26th European Photovoltaics Conference Hamburg, Germany 5-9 September, 2011
3. Muhammad Tayyib and Jens Theobald, etl. 'Accelerated Light-Induced Defect Transformation Study of Elkem Solar Grade Silicon' Proceedings of the 2nd  International Conference on Silicon Photovoltaics Leuven, Belgium 3-5 April, 2012.
4. Muhammad Tayyib and Y. Harshavardhana, etl. 'Initial Light-Induced Degradation Study of Multicrystalline Modules Made up from Silicon Material Processed Through Different Manufacturing Routes'      Accepted ..... Will be publish at 38th IEEE Photovoltaic Specialists Conference 3-8 June, 2012 in Austin. Texas USA.
5. Muhammad Tayyib and Tor Oskar Saetre, etl. 'Micro Defects and Impurity Analyses of Multicrystalline Silicon Solar Cells'       Accepted ..... Will be published at 27th  European Photovoltaics Conference 24-28 September, 2012 in Frankfurt Germany.
6. Muhammad Tayyib and Tor Oskar Saetre, etl. 'Mechanical Fatigue and Stress Analyses of Multicrystaline Silicon Solar cells'         Accepted ..... Will be published at 27th  European Photovoltaics Conference 24-28 September, 2012 in Frankfurt Germany.