W pracy przedstawiono proces wytwarzania i wyniki badań krystalicznych, krzemowych ogniw słonecznych z tylnymi kontaktami punktowymi wytworzonymi wiązką promieniowania laserowego (LFC). Do wytwarzania tylnych kontaktów punktowych zastosowano laser neodymowy Nd:YAG i iterbowy laser włóknowy (YFL). Charakterystykę punktów kontaktowych omówiono w aspekcie wyników badań wykonanych przy pomocy mikroskopii skaningowej (SEM), a analizę ilościową i mikrostruktury w aspekcie wyników uzyskanych w mikroskopii transmisyjnej (TEM). Parametry ogniw słonecznych określono metoda pomiaru charakterystyki prądowo-napięciowej (I-V) i charakterystyki spektralnej. Otrzymano ogniwa o najwyższej sprawności konwersji fotowoltaicznej o wartości 15,16 i 15,80% odpowiednio dla lasera Nd:YAG i YFL.
EN
In this paper we present processing and characterization of the crystalline silicon solar cells with laser-fired back contacts (LFC). For the LFC formation two laser were used: Nd:YAG laser and ytterbium fiber laser (YFL). The results are discussed with the support of scanning electron microscopy (SEM). The cross-section structure and quantitative analysis of the LFC contact regions were studied with transmission electron microscopy (TEM). The current-voltage characteristics and spectral response dependences were performed for solar cells characterization. The best cells with LFC were realized with 15.80 and 15.16% efficiency for Nd:YAG and YFL, respectively.
We present a family with three cases of recombination aneusomy rec(5)dup(5q) originating from a large parental pericentric inversion of chromosome 5. The proband - a 6-year-old girl with mental retardation, speech delay, microcephaly, and slight facial dysmorphism - was referred for subtelomere testing. FISH with a Multiprobe Chromoprobe T System (CytoCell) and with several BAC clones mapping to both subtelomere regions of chromosome 5, revealed a recombinant chromosome rec(5)dup(5q) originating from a paternal pericentric inversion inv(5)(p15.33q35.3). The same inversion was present in the proband’s father’s twin-brother and rec(5)dup(5q) was also identified in his two mentally retarded daughters. The distance of breakpoints from the telomere was: 0.234-1.4 Mb for 5p and 4.1 —4.8 Mb for 5q. HR-CGH analysis confirmed the duplication of the 5q subtelomeric region but did not identify any concomitant deletion in the 5p subtelomere. Precise mapping of the aneusomic regions in the proband enabled mapping the cat cry and speech delay to 5p15.33, making the earlier localizations of these features more precise. Our family shows that the large pericentric inversion with both breakpoints at subtelomeric regions of chromosome 5 is associated with a high risk of rec(5)dup(5q) in the progeny.