Spectrum on Demand Light Source (SOLS) for Advanced Photovoltaic Characterization
Miquel Casademont-Viñas a, Martí Gibert-Roca a, Mariano Campoy-Quiles a, Alejandro R. Goñi a b
a Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Bellaterra, Spain
b Catalan Institution for Research and Advanced Studies (ICREA) Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#DeModeP23 - Characterisation and modeling of devices
València, Spain, 2023 March 6th - 10th
Organizers: Enrique Hernández Balaguera and Alison Walker
Poster, Miquel Casademont-Viñas, 341
Publication date: 22nd December 2022

The photovoltaic (PV) effect provides the most efficient means of converting the overwhelming amount of freely available energy from the sun (ca. 1000 times greater than the total energy consumption worldwide) into electricity. Emerging PV technologies based on materials such as organic, transparent oxides, kesterites, quantum dots and hybrid halide perovskites are increasingly gaining in importance nowadays.[1] Within the emerging PV technologies, many of the breakthroughs achieved in the power conversion efficiency and in device lifetime have been obtained through intensive materials research.[1, 2, 3] Current trends in PV research focus on the search for higher efficiencies through multi-junction concept and the expansion of the range of applications beyond standard solar farms. In this context, material screening and characterization requires many different pieces of equipment (one solar simulator, another light source for indoor, another set for EQE measurements, etc.). In cases like lateral tandem devices, the required setups are simply not commercially available.


We report a multi-purpose spectrum-on-demand light source (SOLS), conceived, primarily, but not exclusively, for the multiple and advanced characterization of photovoltaic (PV) materials and devices. The apparatus is a spectral shaper illumination device, providing a tunable, spectrally shaped and focused light beam, modulated in intensity and/or in a wavelength range with respect to a primary light source. SOLS stands out from the state of the art because it produces almost any spectrum on demand and delivers two types of output: a spectrally shaped and spatially homogeneous beam over its cross section for areal illumination; or a spatially and spectrally split beam into its wavelength components, a unique capability suited to characterize lateral-tandem (Rainbow) solar cells. The tuneability from broadband to narrow band illumination enables two characterization devices into one, namely, a solar simulator for the determination of the power conversion efficiency and an external quantum efficiency measuring system. We expect the SOLS setup to accelerate material screening, enabling the discovery and optimization of novel multi-component materials and devices, in particular, for emergent PV technologies like organic or metal halide perovskites PV, indoors and building integrated PV, agrovoltaics, multi-junction, etc.

The Spanish "Ministerio de Ciencia e Innovación (MICINN)" is gratefully acknowledged for its support through grant No. CEX2019-000917-S (FUNFUTURE) in the framework of the Spanish Severo Ochoa Centre of Excellence program and the AEI/FEDER(UE) grants PID2021-128924OB-I00 (ISOSCELLES) and PDC2022-134001-I00 (SOLS proof of concept). MCV acknowledges a FPI fellowship (PRE2019-089855) from MICINN cofinanced by the European Social Fund and MGR acknowledges the scholarship FPU16/02631 from the Spanish "Ministerio de Educación". MCV and MGR also thank the PhD programme in Materials Science from Universitat Autònoma de Barcelona in which both were enrolled.

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