Improved Performance of Polymer:Polymer Solar Cells by Doping Electron-Accepting Polymers with an Organosulfonic Acid
SCIE
SCOPUS
- Title
- Improved Performance of Polymer:Polymer Solar Cells by Doping Electron-Accepting Polymers with an Organosulfonic Acid
- Authors
- Sungho Nam; Minjung Shin; Hwajeong Kim; Chang-Sik Ha; Ree, M; Youngkyoo Kim
- Date Issued
- 2011-12-06
- Publisher
- wiley
- Abstract
- The performance of polymer:polymer solar cells that are made using blend films of poly(3-hexylthiophene) (P3HT) and poly(9,9-dioctylfluorene-co- benzothiadiazole (F8BT) is improved by doping the F8BT polymer with an organosulfonic acid [4-ethylbezenesulfonic acid (EBSA)]. The EBSA doping of F8BT, to form F8BT-EBSA, is performed by means of a two-stage reaction at room temperature and 60 degrees C with various EBSA weight ratios. The X-ray photoelectron spectroscopy measurement reveals that both sulfur and nitrogen atoms in the F8BT polymer are affected by the EBSA doping. The F8BT-EBSA films exhibit huge photoluminescence quenching, ionization potential shift toward lower energy, and greatly enhanced electron mobility. The short-circuit current density of solar cells is improved by ca. twofold (10 wt.% EBSA doping), while the open-circuit voltage increases by ca. 0.4 V. Consequently, the power conversion efficiency was improved by ca. threefold, even though the optical density of the P3HT:F8BT-EBSA blend film is reduced by 10 wt.% EBSA doping due to the nanostructure and surface morphology change.
- Keywords
- Polymer Solar Cells; Electron-Accepting Polymers; Organosulfonic Acids; Doping; Electron Mobility; RAY PHOTOELECTRON-SPECTROSCOPY; PHOTOVOLTAIC DEVICES; CONJUGATED POLYMERS; EFFICIENCY; FILMS; MORPHOLOGY; BLENDS; LIGHT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17017
- DOI
- 10.1002/ADFM.201101215
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 21, no. 23, page. 4527 - 4534, 2011-12-06
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