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, 18 (39), 27102-27108

Light Stability Tests of CH 3 NH 3 PbI 3 Perovskite Solar Cells Using Porous Carbon Counter Electrodes

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Light Stability Tests of CH 3 NH 3 PbI 3 Perovskite Solar Cells Using Porous Carbon Counter Electrodes

Seigo Ito et al. Phys Chem Chem Phys.

Abstract

The CH3NH3PbI3 perovskite solar cells have been fabricated using three-porous-layered electrodes as, 〈glass/F-doped tin oxide (FTO)/dense TiO2/porous TiO2-perovskite/porous ZrO2-perovskite/porous carbon-perovskite〉 for light stability tests. Without encapsulation in air, the CH3NH3PbI3 perovskite solar cells maintained 80% of photoenergy conversion efficiency from the initial value up to 100 h under light irradiation (AM 1.5, 100 mW cm-2). Considering the color variation of the CH3NH3PbI3 perovskite layer, the significant improvement of light stability is due to the moisture-blocking effect of the porous carbon back electrodes. The strong interaction between carbon and CH3NH3PbI3 perovskite was proposed by the measurements of X-ray photoelectron spectroscopy and X-ray diffraction of the porous carbon-perovskite layers.

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