Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 6, Pages 864-871Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201503273
Keywords
black phosphorus; electron transport layer; organic photovoltaics; solution-processable
Categories
Funding
- PolyU [1-ZE14]
- Research Grants Council (RGC) of Hong Kong, China [T23-713/11]
- Postdoctoral Science Foundation of China [7131701013]
- Hong Kong Scholars Program [G-YZ36]
- Soochow University [32317156, 32317267]
- 863 Program [2013AA031903]
- youth 973 program [2015CB932700]
- NSFC [51222208, 51290273, 91433107]
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2D van der Waals crystals, possessing excellent electronic and physical properties, have been intriguing building blocks for organic optoelectronic devices. Most of the 2D materials are served as hole transport layers in organic devices. Here,it is reported that solution exfoliated few layers black phosphorus (BP) can be served as an effective electron transport layer (ETL) in organic photovoltaics (OPVs) for the first time. The power conversion efficiencies (PCEs) of the BP-incorporated OPVs can be improved to 8.18% in average with the relative enhancement of 11%. The incorporation of BP flakes with the optimum thickness of approximate to 10 nm can form cascaded band structure in OPVs, which can facilitate electron transport and enhance the PCEs of the devices. This study opens an avenue in using solution exfoliated BP as a highly efficient ETL for organic optoelectronics.
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