Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 131, Issue 51, Pages 18220-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja908441c
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Funding
- NSF [DMR 0547639, 0606414, 0602280]
- Direct For Mathematical & Physical Scien [0602280, 0606414] Funding Source: National Science Foundation
- Division Of Materials Research [0602280, 0606414] Funding Source: National Science Foundation
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To improve injection in n-type organic thin film transistors (OTFTs), a thin conjugated polyelectrolyte (CPE) layer was interposed between electrodes and the semiconductor layer. OTFTs were fabricated with [6,6]-phenyl-C-61 butyric acid methyl ester (PCBM) and Au source and drain contacts. We demonstrate that the insertion of CPEs beneath top-contact Au source/drain electrodes can be a very effective strategy for improving the carrier injection and reducing turn-on threshold voltages of n-channel OTFTs. Ultraviolet photoemission spectroscopy (UPS) indicates that the decrease of the electron injection barrier is consistent with organized dipoles at the metal/organic interface.
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