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En este trabajo se presenta el diseño, la implementación y los primeros resultados de un Laboratorio de Investigación Fotovoltaica desarrollado en las instalaciones del Grupo de Ciencia de Materiales y Energías Renovables (MatER-PUCP) de la Pontificia Universidad Católica del Perú en colaboración con el Grupo de Investigación y Desarrollo en Energía Solar y Automática (IDEA) de la Universidad de Jaén (UJA) de España. Este laboratorio es uno de los primeros en el país con el equipamiento adecuado para la calibración y certificación de diferentes tecnologías, comerciales y emergentes, de módulos fotovoltaicos en el mercado peruano.  Los resultados que se esperan obtener mediante una extensa campaña experimental, que inició en mayo del 2019, podrán ser ofertados a empresas u otras instituciones públicas, como estudios detallados del comportamiento y degradación de las diferentes tecnologías de módulos fotovoltaicos en función de las condiciones climáticas particulares de la ciudad de Lima (niveles de irradiancia y su componente difuso, temperatura de operación, humedad, distribución espectral, y polvo).

We demonstrate that the modulated surface photovoltage spectroscopy (modulated SPS) technique can be applied to investigate interface states in the bandgap, i.e. interface passivation, of crystalline silicon coated with a downshift layer such as hydrogenated aluminum nitride with embedded terbium ions by suppressing straylight with a cut-off filter. Different hydrogen contents influence the surface photovoltage spectra at photon energies below the bandgap of crystalline silicon. Modulated SPS reveals that at higher hydrogen content there is a lower signal and, thus, a lower density of surface defect states. Our experiments show that modulated SPS can become a powerful tool for characterizing defect states at interfaces which cannot be easily studied by other methods.

We report on ‘extreme overirradiance’ events measured in Lima, Peru. The highest measured irradiance value was 1543 W/m2 on March 23rd, 2020. The measurements were carried out by four different, independent instruments, all simultaneously recording their maximum values. The spectral distribution of the extreme overirradiance event was also recorded and compared to the spectral distributions of a clear and a cloudy sky. The extreme overirradiance phenomenon demonstrated an irradiance enhancement in the entire measured spectrum, but predominantly in the visible and the near infrared region of the spectrum (450 nm to 1100 nm). This spectral enhancement leads to a redshift of the spectrum during the extreme overirradiance event, as is observed by its lower average photon energy in comparison to the clear and cloudy sky spectra.