HomeOrganic ElectronicsPCBM-Based n-Type Semiconductors

PCBM-Based n-Type Semiconductors

Unique chemistry and physics of fullerene (C60) materials continue to stimulate advances in applied and fundamental science. Fullerenes are known as excellent electron acceptors and can be chemically modified to improve solubility in organic solvents. Such soluble fullerene derivatives are known as some of the best n-type organic semiconductors1. Moreover, molecular heterojunctions made by covalently linking fullerenes with electron donating or photoactive macromolecules show promise as intrinsic p/n-type semiconductors and even artificial mimics of biological photosynthesis.2 To help our customers achieve their research breakthroughs in organic electronics, we are pleased to offer a line of high quality functionalized fullerene products.

Methanofullerene Phenyl-C61-Butyric-Acid-Methyl-Ester ([60]PCBM) is an effective solution processable n-type organic semiconductor. It can be blended with p-type conjugated polymers to make photovoltaic (PV) cells3,4 and thin-film organic field effect transistors (OFETs),5 and has also shown promise for use in photodectors.6 [60]PCBM is soluble in the same organic solvents as excellent p-type semiconductors such as: MDMO-PPV, MEH-PPV and P3HT (Table 1). This simplifies the preparation of blends and solution processing of heterojuction PV cells and OFETs. The high affinity of PCBM results is efficient photo-induced electron transfer from p-type polymers as well as from metal electrodes in biased thin-film OFETs.7 Power conversion efficiencies of up to ~4.4% have been reported for bulk heterojunction PV cells made with [60]PCBM.8

Table 1Conduction (LUMO) and valence (HOMO) band energies of p- and n-type organic semiconductors available in our catalog

The fabrication of thin film organic electronics devices is complex, with slight variations of molecular structures having profound effects on film morphology and charge transport. To help you optimize the performance of your devices, We are pleased to offer a library of PCBMs that includes [60]PCBM analogs based on higher fullerenes (C70 and C84), as well as those derived by chemical alterations of the addend moeiety to vary solubility and electronic properties. Members of the library have shown advantages in different devices and will help you explore and experiment in your research. Different purity grades of [60]PCBM are available for device scale-up, research, and exploratory work (Tables 2 and 3). 

Table 2Our PCBM Library
Table 3Properties of selected PCBMs
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Anthopoulos TD, de Leeuw DM, Cantatore E, van ?t Hof P, Alma J, Hummelen JC. 2005. Solution processible organic transistors and circuits based on a C70 methanofullerene. Journal of Applied Physics. 98(5):054503.
Wienk MM, Kroon JM, Verhees WJH, Knol J, Hummelen JC, van Hal PA, Janssen RAJ. 2003. Efficient Methano[70]fullerene/MDMO-PPV Bulk Heterojunction Photovoltaic Cells. Angew. Chem. Int. Ed.. 42(29):3371-3375.
Anthopoulos T, Kooistra F, Wondergem H, Kronholm D, Hummelen J, de?Leeuw D. 2006. Air-Stable n-Channel Organic Transistors Based on a Soluble C84 Fullerene Derivative. Adv. Mater.. 18(13):1679-1684.
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Popescu LM, van ?t Hof P, Sieval AB, Jonkman HT, Hummelen JC. 2006. Thienyl analog of 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene for bulk heterojunction photovoltaic devices in combination with polythiophenes. Appl. Phys. Lett.. 89(21):213507.
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