Fullerene bisadduct as an effective phase-separation inhibitor in preparing poly(3-hexylthiophene)-[6,6]-phenyl-C 61-butyric acid methyl ester blends with highly stable morphology
Journal
Journal of Materials Chemistry
Journal Volume
22
Journal Issue
31
Pages
15586-15591
Date Issued
2012
Author(s)
Abstract
This work demonstrates that the bis-adduct of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is an effective inhibitor of the aggregation of PCBM inside the poly(3-hexylthiophene) (P3HT) matrix. Substituting some of the PCBM with bis-PCBM apparently reduces the size of PCBM-rich clusters, enhancing both the short-circuit current density (JSC) and the fill factor (FF), leading to a ∼17% increment in power conversion efficiency (PCE) for a cell with 8.3 wt% bis-PCBM replacement. More importantly, a tiny amount of bis-PCBM significantly improves the morphological stability of P3HT–PCBM blend against high-temperature aging. All P3HT–PCBM:bis-PCBM devices exhibit extremely stable PCEs, which do not visibly change upon heating at 150 °C for 15 hours.
SDGs
Publisher
Royal Society of Chemistry
Type
journal article