Degradation analysis in mixed (MAPbI3 and MAPbBr3) perovskite solar cells under thermal stress
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The current study provides an insight into the thermal stability of perovskite solar cells (PSCs) and the factors causing their degradation. To this end, a systematic stability study was carried out on n-i-p type perovskite solar cells involving mesoporous TiO2 layer. The samples were subjected to varying moisture and thermal conditions under light soaking while being exposed to long-term indoor (5000 h) and outdoor (75 h) harsh environmental conditions (i.e. 30%–80% RH and 40 °C–70 °C). To identify performance and morphological changes of PSCs after exposure to thermal stress, advanced characterization techniques including impedance spectroscopy, scanning electron microscopy and glow discharge optical emission spectrometry along with I–V characteristics were used. The un-encapsulated samples exposed to high thermal stress (40–70 °C) show degradation in their efficiency more than 40% within the 75 h of thermal stress. In contrast, the samples that were kept at room temperature were found to be very stable over 5000 h.
This work was supported by Qatar University Internal Grant No. QUCG-CAM-2018/19-1 and NPRP Grant # 6-175-2-070 from Qatar National Research Fund (a member of Qatar Foundation). The findings achieved herein are solely the responsibility of the authors. The authors are thankful to the Center for Advanced Materials (CAM), Qatar University for providing the laboratory support to conduct this work. Thanks to HORIBA Scientific—Jocelyne Marciano, Sofia Gaiaschi and Patrick Chapon for the GD measurements and interpretation.
ZA and MKN planned the experiment for degradation analysis. SP prepare the samples. ZA and ASS performed experiment. ZA and ASS analyzed the data and wrote the manuscript, SAA-M, FT, JB, NJA-T and MKN took part actively the discussion during the preparation and reviewing of the manuscript. MKN and SP validate the results.
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Conflict of interest
The authors declare that there is no conflict of interest.
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