High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer
SCIE
SCOPUS
- Title
- High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer
- Authors
- Kyung-Geun Lim; Mi-Ri Choi; Ho-Beom Kim; Jong Hyeok Park; Lee, TW
- Date Issued
- 2012-12
- Publisher
- Royal Society of Chemistry
- Abstract
- We employed a low-cost solution-processed ultrathin insulating polymeric layer of poly(4-hydroxystyrene) (PHS), with a high glass transition temperature (T-g similar to 185 degrees C), as an interfacial layer between the polymer: fullerene photoactive layer and the Al negative electrode for enhancing device power conversion efficiency (PCE) of polymer bulk-heterojunction photovoltaic cells and investigated the roles of the interfacial nanolayer by ultraviolet photoemission spectroscopy and capacitance-voltage measurement. The thin polymeric layer forms a dipole layer and causes the vacuum level of the adjacent negative electrode to shift upward, which resulted in an increase of the built-in potential. As a result, the open-circuit voltage and PCE of the device using a PHS nanolayer were remarkably improved. We finally achieved a very high PCE of 6.5% with the PHS/Al negative electrode which is even much better than that of the device using an Al electrode (5.0%). The solution-processed inexpensive PHS layer with a high T-g can be an attractive alternative to conventional vacuum-deposited low-work-function metal and insulating metal fluoride interfacial layers.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/10964
- DOI
- 10.1039/c2jm35016e
- ISSN
- 0959-9428
- Article Type
- Article
- Citation
- Journal of Materials Chemistry, vol. 22, no. 48, page. 25148 - 25153, 2012-12
- Files in This Item:
-
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.