Interface-induced crystallization and nanostructure formation of [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) in polymer blend films and its application in photovoltaics

Yufei Zhong, Kaori Suzuki, Daishi Inoue, Daisuke Hashizume, Seiichiro Izawa, Kazuhito Hashimoto, Tomoyuki Koganezawa, Keisuke Tajima

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Crystallization of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) in thin films and in blend films with various polymers was investigated by X-ray diffraction. Thermal annealing induced the crystallization of PCBM in the blend films only through direct contact with a crystallized pure PCBM layer beneath, suggesting that an epitaxial crystallite growth occurred from the bottom interface. The morphology of the crystals depended strongly on the mixing ratio and the crystal structure of the bottom layer, and nanorod-like PCBM crystallites with widths in the range of 100–150 nm and lengths in the range of 150–500 nm were observed. A bulk-heterojunction (BHJ) organic solar cell utilizing the PCBM crystallite as the acceptor showed the highest VOC of 0.83 V for a PTB7:PCBM device to date. These findings offer the ways to use the crystallized PCBM with the controlled nanostructures as the electron conducting materials in organic and hybrid perovskite photovoltaics.
Original languageEnglish (US)
Pages (from-to)3335-3341
Number of pages7
JournalJOURNAL OF MATERIALS CHEMISTRY A
Volume4
Issue number9
DOIs
StatePublished - Feb 4 2016
Externally publishedYes

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