Molecular Intercalation and Cohesion of Organic Bulk Heterojunction Photovoltaic Devices

Christopher Bruner, Nichole C. Miller, Michael D. McGehee, Reinhold H. Dauskardt

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The phase separated bulk heterojunction (BHJ) layer in BHJ polymer:fullerene organic photovoltaic devices (OPV) are mechanically weak with low values of cohesion. Improved cohesion is important for OPV device thermomechanical reliability. BHJ devices are investigated and how fullerene intercalation within the active layer affects cohesive properties in the BHJ is shown. The intercalation of fullerenes between the side chains of the polymers poly(3,3″′-didocecyl quaterthiophene) (PQT-12) and poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene (pBTTT) is shown to enhance BHJ layer cohesion. Cohesion values range from ≈1 to 5 J m -2, depending on the polymer:fullerene blend, processing conditions, and composition. Devices with non-intercalated BHJ layers are found to have significantly reduced values of cohesion. The resulting device power conversion efficiencies (PCE) are also investigated and correlated with the device cohesion. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)2863-2871
Number of pages9
JournalAdvanced Functional Materials
Volume23
Issue number22
DOIs
StatePublished - Jan 17 2013
Externally publishedYes

Fingerprint Dive into the research topics of 'Molecular Intercalation and Cohesion of Organic Bulk Heterojunction Photovoltaic Devices'. Together they form a unique fingerprint.

Cite this