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Photo-induced unidirectional electron transfer in a porphyrin heterojunction

✍ Scribed by Tom J. Savenije; Rob B.M. Koehorst; Tjeerd J. Schaafsma

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 536 KB
Volume: 244
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(95)00957-6

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✦ Synopsis

Organic heterojunctions made by deposition of two different types of porphyrins onto an ITO substrate by electro-polymerisation and spin-coating exhibit rectification upon illumination. The redoxpotentials for the various porphyrin D/A combinations can be varied by using different porphyrin metal centers. Different exothermicities for photo-induced electron-transfer in this way results in different values of the short circuit current. Depending on layer thickness and type of porphyrins, the open circuit voltage is ~< -0.4 V and the incident photon to current efficiency is 2.5% at 440 nm. Possible mechanisms for the observed rectification are discussed.

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