To evaluate the outdoor performance and stability of Perovskiet sun cells using contactless and non-invasive methods, an Australian and Chinese research team found a way to use photoluminescence imaging and to show a proof of concept for implicit open-circuit voltage. Their research was based on cost -effective equipment that works under direct sunlight.
In order to check and assess the stability and performance of Perovskite Solar Cells in a contactless way, a team, led by researchers from the University of New South Wales (UNSW) in Australia, showed a solution that depends on photolumin measurements and open-circuit voltage image techniques.
The team said it was the first proof of concept for quantitative implicit open circuit voltage (IVOC) imaging.
“Onze studie toont fotoluminescentie buiten en impliceerde open-circuit spanningsbeeldvorming van perovskiet zonnecellen onder volledig zonlicht. Met andere woorden, het laat zien dat we nu de ruimtelijke opto-elektronische kwaliteit van deze cellen rechtstreeks in het veld kunnen beoordelen,” vertelde Félix Gayot, overeenkomstige auteur van het onderzoek, verteld, verteld, verteld, verteld, verteld, verteld, verteld, verteld, told, told, told, told, told PV -Magazine.
“This ability can be valuable in particular for researchers who carry out outside breakdown or aging studies, because during the experiment it offers critical spatial information. We believe that this added dimension of quality evaluation can considerably help we deepen solid breakdown mechanisms,” he added.
In comparison with conventional photoluminescence (PL) imaging and standard outdoor monitoring, the researchers approach offers various benefits, according to Gayot. Traditional photoolumin -language formation usually requires a dark, slightly sleek environment to prevent interference through ambient light.
“Our method eliminates that need, which makes comparable measurements possible under natural sunlight. Moreover, it also shows quantitative calibration of the signal in voltage, which was never done before outside the home,” he explained.
The quantitative outdoor implicit open circuit voltage (IVOC) imaging is an indirect method that previously used research to evaluate the maximum achievable open circuit voltage and the quality of photovoltaic devices. “Moreover, the measurement of IVOC offers with different lighting intensities (Suns IVOC) and comparing with the luminous voltage (IV) Curve information about series resistance,” the team explained.
“Compared to standard outside monitoring, which usually only offers global parameters, such as efficiency, filling factor and terminal flow/voltage, the new approach adds spatially dissolved information and offers a much richer dataset for analysis,” Gayot said.
The new method is non-invasive and contactless and relies on cheap equipment to obtain the outside images, such as a cheap astronomy camera, an industrial lens, a ready-made filter and a free light source.
Indeed, the PL images were recorded with a complementary metal-oxide-Half-Half-Half-Half-Guide camera with a few narrow band pass filters (BPF) for the lens.
The PL setup includes imaging of 5 cm x 5 cm mini modules with six encapsulated perovskite solar cells that were connected in series on a substrate in series. The cell devices measured in the IVOC image formation tests were smaller with an active area of 0.06 cm2 and a power conversion -efficiency above 20%. The tests were performed with sunlight excitation under clear heaven conditions in Sydney, Australia.
Further details of the setup and the results are given in the study “Outdoor implicit open circuit voltage Imaging of perovskite solar cells using sunlight excitation“Published in Joule.
The research team included researchers from the supplier of Perovskite Solar Manufacturing Equipment in China Phoenixolar Optoelectronics Co., Ltd.
The group plans to extend the applications of technology to concentrated photovoltaic (CPV) solar cells and to improve robustness against temperature variations. “We are also planning to expand our method to Tandem Solar cells,” said Gayot.
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