Morphology analysis of near IR sensitized polymer/fullerene organic solar cells by implementing low bandgap heteroanalogue C-/Si-PCPDTBT

Ameri T, Khoram P, Heumüller T, Baran D, Machui F, Troeger A, Sgobba V, Guldi DM, Halik M, Rathgeber S, Scherf U, Brabec C (2014)

Publication Language: English

Publication Type: Journal article, Report

Publication year: 2014

Journal

Book Volume: 2

Pages Range: 19461-19472

URI: http://pubs.rsc.org/en/content/articlelanding/2014/ta/c4ta04070h#!divAbstract

DOI: 10.1039/c4ta04070h

Abstract

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 with CRIS profile

Additional Organisation(s)

Involved external institutions

Universität Koblenz-Landau Germany (DE) Bergische Universität Wuppertal Germany (DE)

How to cite

APA:

Ameri, T., Khoram, P., Heumüller, T., Baran, D., Machui, F., Troeger, A.,... Brabec, C. (2014). Morphology analysis of near IR sensitized polymer/fullerene organic solar cells by implementing low bandgap heteroanalogue C-/Si-PCPDTBT. Journal of Materials Chemistry A, 2, 19461-19472. https://dx.doi.org/10.1039/c4ta04070h

MLA:

Ameri, Tayebeh, et al. "Morphology analysis of near IR sensitized polymer/fullerene organic solar cells by implementing low bandgap heteroanalogue C-/Si-PCPDTBT." Journal of Materials Chemistry A 2 (2014): 19461-19472.

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