Insights into structural and morphological properties of flexible perovskite solar modules with different barrier film under damp-heat test

Abdurashid Mavlonov, Takayuki Negami, Hiroki Mori, Navapat Krobkrong, Mitsuki Yamanishi, Tomohiko Hara, Yoshihiro Hishikawa, Yu Kawano, Akinobu Hayakawa and Takashi Minemoto

Renewable Energy, 2025, vol. 250, issue C

Abstract: Structural and morphological properties were studied via destructive measurements after damp-heat test (DHT) on flexible perovskite solar cell modules with a device structure of “front polyethylene terephthalate (PET) with barrier layer/encapsulant/PET/In2O3:Sn (ITO)/compact-TiO2/mesoporous-TiO2/MAPbI3/Spiro-OMeTAD/metal electrode/encapsulant/back PET with Al layer”. Solar cell parameters tend to decrease with increasing the DHT duration and water vapor transmission rate of the barrier film, whereas “S-shape” developed in current-voltage curves that is an indication for the presence of second diode component in the device structure. After 2000h DHT, back PET film with aluminum layer, metal-electrode layer, and Spiro-OMeTAD layer were peeled off in sequence to study the structural and morphological properties of perovskite layer. Moreover, numerical simulations were carried out to understand the degradation mechanisms through the utilization of one-dimensional SCAPS device simulation software. Overall, the formation of PbI2, which segregated in plane, was suggested to be the main degradation mechanism under DHT, possibly acting as a second diode component in the cells. Since the formation of PbI2 is mainly triggered by water/humidity, it can be minimized or even suppressed by improving the quality of barrier film.

Keywords: MAPbI3 film; Perovskite solar cell module; Damp-heat; PbI2 formation; WVTR (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:250:y:2025:i:c:s0960148125010110

DOI: 10.1016/j.renene.2025.123349

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