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Laser Beam Induced Current (LBIC) imaging is a nondestructive characterization technique which can be used for research into semiconductor and photovoltaic devices (Dimassi et al., 2008). Since its first application to p-n junction photodiode structures used in HgCdTe infrared focal plane arrays in the late 1980s, many experimental studies have demonstrated the LBIC technique’s capacity to electrically map active regions in semiconductors, as it enables defects and details to be observed which are unobservable with an optical microscope (van Dyk et al., 2007). Thus, the LBIC technique has been used for research in different fields related to photovoltaic energy: the superficial study of silicon structures (Sontag et al. 2002); the study of grain boundaries on silicon based solar cells (Nishioka et al., 2007); the study of polycrystalline solar cells (Nichiporuk et al., 2006); the study of thin film photovoltaic modules (Vorasayan et al., 2009); the study of non-silicon based photovoltaic or semiconductor devices (van Dyk et al., 2007) and the study of dye-sensitized solar cells (Navas et al., 2009). In this technique, a highly stabilized laser beam is focused on the photoactive surface of a cell and performs a two-dimensional scan of the photoactive surface, measuring the photoresponse generated point to point. A correlation between the number of incident photons and the quantity of photoelectrons generated derived from the photocurrent measurement makes it possible to obtain the photoconverter efficiency, which is the quantum efficiency of the device at each point of the active surface. Thus, the LBIC technique allows images of photovoltaic devices to be obtained dependent upon superficial variation in quantum efficiency. Usually photocurrent values are measured at short circuit as it is a linear function of the radiation power in a wide range and the interaction coefficient is proportional to the quantum photoefficiency (Bisconti et al., 1997). Three main factors can be associated to the level of photocurrent generated by a photovoltaic surface: (a) the limit values of photon energy that are necessary for electron transfer between valence and conduction bands, (b) the intrinsic characteristics of electron-hole recombination, and (c) photon penetration into the active material. So, the numerical value of the photoefficiency signal generated at each point is computer stored according to its positional coordinates. Using the stored signal, an image is generated

Trichromatic High Resolution-LBIC: A System for the Micrometric Characterization of Solar Cells