Influence of laser fluence and pulse duration on patterning of
perovskite solar cells: An analysis of optoelectronic and electrical
parameters by hyperspectral photoluminescence imaging
Abstract
Up-scaling of perovskite solar cells and modules requires both the
development of suitable laser patterning processes for series
interconnection of the cells and the quantification of the spatial
distribution of solar cell parameters. Here, we investigate perovskite
solar cells patterned with ns and ps laser pulses at varying laser
fluences and analyze them with hyperspectral photoluminescence (PL)
imaging. Based on these images, mappings of the distribution of the
central PL wavelength, the quasi-Fermi-level splitting, the Urbach
energy and the shunt resistance were calculated. From the behavior of
these parameters, particularly in the vicinity of the laser trenches, we
infer laser-material interaction processes and their influence on the
electrical performance of the interconnected cells. It is shown that
both ps and ns laser pulses can be used for successful series
interconnection with low electrical losses in a very narrow edge
regions, provided that the fluence is carefully adjusted.