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> (2019) Synergistic effect of charge separation and, defect passivation using zinc porphyrin
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(2019) Synergistic effect of charge separation and defect passivation using zinc porphyrin dye incorporation for efficient and stable perovskite solar cells
Источники:
- https://www.researchgate.net/publication/33...ite_solar_cells
- Journal of Materials Chemistry A
DOI: 10.1039/C9TA09369A

Авторы: Yu Zhou, Han Zhong, Jianhua Han, Hong Lin

QUOTE
Organic-inorganic perovskite solar cells (PSCs) suffer from massive ionic defects within perovskite layers, which are regarded as one of the major sources for charge recombination. Herein, zinc porphyrin dye, that is YD2-o-C8, is utilized to fabricate high-quality perovskite film with enhanced film crystallinity and uniform morphology.

We find that the YD2-o-C8 molecules with carboxylate group are able to anchor with under-coordinated Pb²⁺ defects in the perovskite films which would suppress charge recombination. Moreover, perovskite with YD2-o-C8 forms an appropriate energy level alignment which is found to be beneficial to both charge separation and extraction in n-i-p devices. Due to these improvements, the best performing device with YD2-o-C8 shows a PCE of 20.5% with reduced hysteresis, while the unmodified devices show a champion efficiency of 18.5%. Unencapsulated PSCs with YD2-o-C8 exhibit better ambient stability, retaining 93% of their initial PCE after storing in ambient air (25-40 °C, 20-40% relative humidity) under dark conditions for 30 days.

Our findings present an effective way for defect passivation in perovskite solar cells using mature, low-cost dye molecules which would be favorable for future up-scaling fabrications.


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