Influence of metal cathode for organic photovoltaic device performance

Title
Influence of metal cathode for organic photovoltaic device performance
Authors
어용석이희우진병두유재웅
Keywords
Organic Photovoltaic; Metal Electrode; Charge Extraction; Series Resistance; Open Circuit Voltage
Issue Date
2009-09
Publisher
Synthetic metals
Citation
VOL 159, NO 17-18, 1910-1913
Abstract
Influences of metal electrode on the performance of organic photovoltaic device were studied. An appropriate energy level was set between HOMO of donor material and LUMO of acceptor material used to fabricate device and metals with workfunction above, below and within this appropriate range were selectively chosen to form electron collecting electrode. Metals which can form an Ohmic contact showed enhanced power conversion efficiency, while metals forming a Schottky type contact showed poor power conversion efficiency. Series resistances showed characteristic values for each range. Open circuit voltages were in the same order with power conversion efficiency, showing a dependence on injection barrier at negative electrode contact. The power conversion efficiency of lowworkfunction metal electrode (i.e. calcium electrode device)was higher than that of gold electrodewhere the electronextraction is spontaneous process.
URI
http://pubs.kist.re.kr/handle/201004/35808
ISSN
0379-6779
Appears in Collections:
KIST Publication > Article
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