Application of metal-doped organic layer both as exciton blocker and optical spacer for organic photovoltaic devices
- 16 October 2006
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 89 (16), 163515
- https://doi.org/10.1063/1.2362974
Abstract
An effective optical spacer based on doping of ytterbium (Yb) metal into bathophenanthroline (BPhen) has been developed for applications in organic photovoltaic (OPV) devices. Utilizing Yb:BPhen as an optical spacer in standard copper phthalocyanine/ C 60 photovoltaic devices, power efficiency can be increased by four times to 3.42%. Ultraviolet photoemission spectroscopy measurements reveal that the good electron transport between C 60 and Yb:BPhen is mainly related to the suitable energy level alignment at the interface. Combining with its high optical transparency and electrical conductivity, the Yb:BPhen film provides a useful means for maximizing the power conversion efficiency of OPV devices.Keywords
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