Light stability tests of CH3NH3PbI3 perovskite solar cells using porous carbon counter electrodes

• Published in: Physical chemistry chemical physics : PCCP Vol. 18; no. 39; pp. 2712 - 2718
• Main Authors: Ito, Seigo, Mizuta, Gai, Kanaya, Shusaku, Kanda, Hiroyuki, Nishina, Tomoya, Nakashima, Seiji, Fujisawa, Hironori, Shimizu, Masaru, Haruyama, Yuichi, Nishino, Hitoshi
• Format: Journal Article
• Language: English
• Published: 2016
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c6cp03388a

The CH 3 NH 3 PbI 3 perovskite solar cells have been fabricated using three-porous-layered electrodes as, 〈glass/F-doped tin oxide (FTO)/dense TiO 2 /porous TiO 2 -perovskite/porous ZrO 2 -perovskite/porous carbon-perovskite〉 for light stability tests. Without encapsulation in air, the CH 3 NH 3 PbI 3 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 CH 3 NH 3 PbI 3 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 CH 3 NH 3 PbI 3 perovskite was proposed by the measurements of X-ray photoelectron spectroscopy and X-ray diffraction of the porous carbon-perovskite layers. Strong moisture-blocking effect by CH 3 NH 3 PbI 3 perovskite-porous carbon layer has been found.