Following the nano-structural molecular orientation guidelines for sulfur versus thiophene units in small molecule photovoltaic cells
SCIE
SCOPUS
- Title
- Following the nano-structural molecular orientation guidelines for sulfur versus thiophene units in small molecule photovoltaic cells
- Authors
- Yu Jin Kim; Park, CE
- Date Issued
- 2016-01
- Publisher
- Royal Society of Chemistry
- Abstract
- In bulk heterojunction (BHJ) organic photovoltaics, particularly those using small molecules, electron donor and/or electron acceptor materials form a distributed network in the photoactive layer where critical photo-physical processes occur. Extensive research has recently focused on the importance of sulfur atoms in the small molecules. Little is known about the three-dimensional orientation of these sulfur atom-containing molecules. Herein, we report on our research concerning the heterojunction textures of the crystalline molecular orientation of small compounds having sulfur-containing units in the side chains, specifically, compounds known as DR3TSBDT that contain the alkylthio group and DR3TBDTT that does not. The improved performance of the DR3TBDTT-based devices, particularly in the photo-current and the fill factor, was attributed to the large population of donor compound crystallites with a favorable face-on orientation along the perpendicular direction. This orientation resulted in efficient charge transport and a reduction in charge recombination. These findings underscore the great potential of small-molecule solar cells and suggest that even higher efficiencies can be achieved through materials development and molecular orientation control.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37657
- DOI
- 10.1039/C6NR00775A
- ISSN
- 2040-3364
- Article Type
- Article
- Citation
- Nanoscale, vol. 8, no. 14, page. 7654 - 7662, 2016-01
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