NDLI: Melt-processing of small molecule organic photovoltaics via bulk heterojunction compatibilization† †Electronic supplementary information (ESI) available: Fig. S1–S8, Tables S1–S3 as described in the main text, full synthetic procedure and characterization of MCP. See DOI: 10.1039/c8gc00335a

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Melt-processing of small molecule organic photovoltaics via bulk heterojunction compatibilization† †Electronic supplementary information (ESI) available: Fig. S1–S8, Tables S1–S3 as described in the main text, full synthetic procedure and characterization of MCP. See DOI: 10.1039/c8gc00335a

Content Provider	Semantic Scholar
Author	Rahmanudin, Aiman Yao, Liang Jeanbourquin, Xavier A. Liu, Yongpeng Sekar, Arvindh Ripaud, Emilie Sivula, Kevin
Copyright Year	2018
Abstract	Melt-processing of organic semiconductors (OSCs) is a promising environmentally-friendly technique that can alleviate dependence on toxic chlorinated solvents. While melt-processed single-component OSC devices (e.g. field-effect-transistors) have been demonstrated, multi-component bulk heterojunctions (BHJs) for organic photovoltaics (OPVs) remain a challenge. Herein, we demonstrate a strategy that affords tunable BHJ phase segregation and domain sizes from a single-phase homogeneous melt by employing strongly-crystalline small-molecule OSCs together with a customized molecular compatibilizing (MCP) additive. An optimized photoactive BHJ with 50 wt% MCP achieved a device power conversion efficiency of ca. 1% after melting the active layer at 240 °C (15 min, followed by slow cooling) before deposition of the top electrode. BHJ morphology characterization using atomic force and Kelvin probe microscopy, X-ray diffraction, and photo-luminescence measurements further demonstrate the trade-off between free charge generation and transport with respect to MCP loading in the BHJ. In addition, a functional OPV was also obtained from the melt-processing of dispersed micron-sized solid BHJ particles into a smooth and homogeneous thin-film by using the MCP approach. These results demonstrate that molecular compatibilization is a key prerequisite for further developments towards true solvent-free melt-processed BHJ OPV systems.
Starting Page	2218
Ending Page	2224
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1039/c8gc00335a
PubMed reference number	29904283
Journal	Medline
Volume Number	20
Alternate Webpage(s)	http://pubs.rsc.org/en/content/articlepdf/2018/gc/c8gc00335a
Alternate Webpage(s)	http://www.rsc.org/suppdata/c8/gc/c8gc00335a/c8gc00335a1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/c8gc00335a
Journal	Green chemistry : an international journal and green chemistry resource : GC
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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