| Title |
Ultrashort pulsed laser processing of thin-films for solar cells / |
| Translation of Title |
Plonasluoksnių saulės elementų apdirbimas ultratrumpais lazerių impulsais. |
| Authors |
Gečys, Paulius |
| Full Text |
|
| Pages |
139 |
| Keywords [eng] |
CIGS solar cells ; laser scribing ; interconnects ; thin-films ; ultrashort pulsed laser. |
| Abstract [eng] |
Present PhD thesis is the experimental and theoretical analysis of thin layer ultrashort pulsed laser ablation processes for photovoltaic devices. Experimental work was supported by modeling and simulation of energy coupling and dissipation inside the layers. The absorbed laser energy was transformed to localized transient heating inside the structure. Selectiveness of the ablation process was defined by optical and mechanical properties of the materials, and selection of the laser wavelength facilitated control of the structuring process. The 1064 nm wavelength was found optimal for the CIGS solar cell scribing in terms of quality and process speed. It is very positive result for industrial applications as the cost and the system complexity are decreased. The solar cell efficiency test revealed minor degradation in photo-electrical efficiency after the laser scribing was applied to the solar cell samples. Lock-in thermography measurements did not revealed any internal shunt formation during laser scribing with picosecond pulse duration. Picosecond lasers with fundamental harmonics and high repetition rates can be used to accomplish efficient and fast scribing process which is able to fit the demands for industrial solar cell scribing applications. |
| Type |
Doctoral thesis |
| Language |
English |
| Publication date |
2012 |
