On the function of a bathocuproine buffer layer in organic photovoltaic cells
نویسندگان
چکیده
The role of bathocuproine BCP buffer layer inserted between active layer and Al contact in photovoltaic cells based on phthalocyanine Pc and C60 was investigated. Photoluminescence PL experiments show exciton quenching at the C60–Al interface to be strongly reduced by inserting BCP. Current-voltage characteristics of photovoltaic cells with planar geometry front electrode/ Pc/C60/BCP/Al show that BCP dramatically improves electron transport out of the C60 film into the Al electrode. The tenfold increase in power conversion efficiency with BCP can mostly be attributed to the latter effect. BCP does not improve in photovoltaic cells with blend film geometry front electrode/Pc:C60/Al. © 2006 American Institute of Physics. DOI: 10.1063/1.2362624
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