TITLE

Oxygen induced p-doping of α-nickel phthalocyanine vacuum sublimed films: Implication for its use in organic photovoltaics

AUTHOR(S)
Anthopoulos, Thomas D.; Shafai, Torfeh S.
PUB. DATE
March 2003
SOURCE
Applied Physics Letters;3/10/2003, Vol. 82 Issue 10, p1628
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The effects of oxygen doping on the charge transport and photovoltaic properties of α-nickel phthalocyanine (α-NiPc) based devices are investigated using in situ and ex situ I-V measurements. I-V characteristics for devices employing gold contacts indicate ohmic conduction at low voltages, followed by space-charge-limited conduction in higher fields. Upon exposure of NiPc to dry air an increase in the hole concentration (o[sub 0]) from 8.5 × 10[sup 10] to 2.6 × 10[sup 15] m[sup -3] is observed. When the top gold ohmic cathode is replaced by lead, Schottky type behavior is evident with the junction exhibiting photovoltaic effect. The energy conversion efficiency of the cell increases following exposure to oxygen. These results suggest that fabrication of air stable electronic devices based on NiPc is feasible.
ACCESSION #
9214360

 

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