Lazeriniai procesai monolitinių jungčių plonasluoksniuose saulės elementuose formavimui ; Laser processes for monolithic interconnection formation in thin-film solar cells

Dissertation work aimed to investigate the laser processing of the P2 and P3 scribes in thin-film solar cells searching for optimal laser pulse duration, laser repetition rate, wavelength, and various scribing approaches based on the in-house developed novel direct electrical measurement technique of electrical performance of the thin-film solar cells. The dissertation work consists of an introduction, author’s publication list, literature review, methods, results, conclusions, references and a summary. In the thesis, a novel direct electrical measurement technique (LLST) was developed and investigated in CIGS and CZTSe thin-film solar cells. LLST measurements revealed the relationship between the P3 scribe conductivity and the used laser wavelength. Increasing the laser pulse repetition rate, increased heat accumulation in the cells, which was observed as the pronounced melting of the laser-scribed areas and increased scribe conductivity. Finally, it was shown that scribing with picosecond duration pulses at the 1 MHz pulse repetition rate could locally transform a CIGS absorber layer into a highly conductive compound suitable to act as a P2 interconnect.