Interface modification to optimize charge separation in cyanine heterojunction photovoltaic devices

We investigate heterojunction photovoltaic devices using the carbocyanine 1,1'-diethyl-3,3,3',3'-tetramethylcarbocyanine perchlorate (Cy5) as donor and buckminsterfullerene (C<sub>60</sub>) as acceptor. We find that photocurrent generation occurs at the interface between CY5 and indium tin oxide (ITO) as well as at the organic heterointerface. By analyzing the spectral dependence of the photocurrent as a function of applied voltage, we were able to demonstrate that poly(3,4-ethylenedioxythiophene) (PEDOT) inhibits electron injection from the cyanine into ITO. Since the photocurrent generation at the ITO electrode is opposite to the one generated at the organic heterojunction, the use of PEDOT leads to increased short-circuit current and open-circuit voltage. [All rights reserved Elsevier]


Published in:
Solar Energy Materials and Solar Cells, 87, 1-4, 817
Year:
2005
Publisher:
Elsevier
Keywords:
Note:
Swiss Fed. Labs. for Mater. Testing & Res.-EMPA, Dubendorf, Switzerland
Copyright 2006, IEE
8800561
0927-0248
interface modification
charge separation
cyanine heterojunction photovoltaic devices
carbocyanine 1,1'-diethyl-3,3,3',3'-tetramethylcarbocyanine perchlorate
buckminsterfullerene
photocurrent generation
indium tin oxide electrode
organic heterointerface
spectral dependence
poly(3,4-ethylenedioxythiophene)
electron injection inhibition
short-circuit current
open-circuit voltage
ITO
InSnO
Other identifiers:
Laboratories:




 Record created 2007-04-03, last modified 2018-03-17


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