Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 45, Pages 19461-19472Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta04070h
Keywords
-
Funding
- Cluster of Excellence Engineering of Advanced Materials at the University of Erlangen-Nuremberg - German Research Foundation (DFG) within the framework of its Excellence Initiative, Organic Semiconductors for NIR Optoelectronics (OSNIRO) [607585]
- Cluster of Excellence Engineering of Advanced Materials at the University of Erlangen-Nuremberg - German Research Foundation (DFG) within the framework of its Excellence Initiative, Synthetic Carbon Allotropes [SFB953]
- DFG [BR 4031/2-2]
- Solar Technologies go Hybrid (SolTech)
Ask authors/readers for more resources
In the current work, we have investigated the morphological aspects of the ternary solar cells based on host matrices of P3HT:PCBM and P3HT:ICBA, using the low bandgap polymer analogues of C-and Si-bridged PCPDTBT as near IR sensitizers, which show noticeably different performance. A direct comparison of these well-functional and poorly functional ternary blend systems provides insights into the bottlenecks of device performance and enables us to set up an initial set of design rules for ternary organic solar cells. Our study reveals the importance of surface energy as a driving force controlling sensitizer location and morphology formation of ternary blends. The interfacial surface energy results indicate that Si-PCPDTBT locates at amorphous interfaces and P3HT crystallites, while C-PCPDTBT tends to accumulate at amorphous interfaces and semi-crystalline (or agglomerated) domains of the fullerene derivatives. GIWAXS and SCLC results support this prediction where adding high content of C-PCPDTBT influences mainly the semi-crystallinity (aggregation) of the fullerene and reduces the electron mobility, but Si-PCPDTBT impacts mainly the P3HT ordering and, in turn, deteriorates the hole mobility. These findings show that the disruption of the fullerene semi-crystalline domains is more detrimental to the device performance than the disruption of the polymer domains.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available