17/10/2022
The employment of perovskites as the active material in solar cells has undergone an extremely rapid development in the last few years mainly due to the remarkable properties of these materials, such as the low-cost, the high visible light absorption, and other properties related to electric charge production and transport.
The most common characterization technique of perovskites is photoluminescence and the emitting properties of these materials have often been related to the performances of the perovskite based solar cells. However, the large variability in perovskite morphology, the low reproducibility in the synthesis, and the quite unsystematic characterization reported in many literature works, have prevented the identification of a clear correlation between photoluminescence and conversion efficiency of a perovskite solar cell.
In their new work, researchers from Istituto per la microelettronica e i microsistemi (Cnr-Imm) and Istituto di struttura della materia (Cnr-Ism), both of the National Research Council of Italy, in collaboration with CHOSE (Centre for Hybrid and Organic Solar Energy – Regione Lazio), have performed a systematic study to clarify this correlation, using a large group of PSCs realized with different perovskites and fabrication processes, and with efficiency varying from 5.63% to 21.5%. The authors have also developed a simple model able to assess some transport properties of the electric charge in the solar cell. They show that the photoluminescence quenching measured in the open and short circuit conditions can be used to directly determine the solar cell efficiency with a surprisingly high level of generality and precision.
This kind of measurement is very easy to implement and the necessary instrumentation unexpensive and compact. Therefore, it could be implemented in large-scale productions or in small research and development laboratories to provide a rapid and cheap evaluation of the efficiency of cell being produced.
The research has been published in the Solar RRL journal with the title “Re-evaluation of Photoluminescence Intensity as an Indicator of Efficiency in Perovskite Solar Cells", by Valerio Campanari, Faustino Martelli, Antonio Agresti, Sara Pescetelli, Narges Yaghoobi Nia, Francesco Di Giacomo, Daniele Catone, Patrick O'Keeffe, Stefano Turchini, Bowen Yang, Jiajia Suo, Anders Hagfeldt and Aldo Di Carlo.
Per informazioni:
Valerio Campanari
Cnr - Istituto di struttura della materia
valerio.campanari@ism.cnr.it
Faustino Martelli, Cnr-Imm, email: faustino.martelli@cnr.it
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