Mesostructured Fullerene Electrodes for Highly Efficient n–i–p Perovskite Solar Cells

Yufei Zhong, Rahim Munir, Ahmed Albalawi, Arif D. Sheikh, Liyang Yu, Ming-Chun Tang, Hanlin Hu, Frédéric Laquai, Aram Amassian

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Electron-transporting layers in today's stateof-the-art n-i-p organohalide perovskite solar cells are almost exclusively made of metal oxides. Here, we demonstrate a novel mesostructured fullerene-based electron-transporting material (ETM) that is crystalline, hydrophobic, and cross-linked, rendering it solvent-and heat resistant for subsequent perovskite solar cell fabrication The fullerene ETM is shown to enhance the structural and electronic properties of the CH3NH3PbI3 layer grown atop, reducing its Urbach energy from similar to 26 to 21 meV, while also increasing crystallite size and improving texture. The resulting mesostructured n-i-p solar cells achieve reduced recombination, improved device-to-device variation, reduced hysteresis, and a power conversion efficiency above 15%, surpassing the performance of similar devices prepared using mesoporous TiO2 and well above the performance of planar heterojunction devices on amorphous or crystalline [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM). This work is the first demonstration of a viable, hydrophobic, and high-performance mesostructured electron-accepting contact to work effectively in n-i-p perovskite solar cells.
Original languageEnglish (US)
Pages (from-to)1049-1056
Number of pages8
JournalACS Energy Letters
Volume1
Issue number5
DOIs
StatePublished - Oct 27 2016

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