Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a similar to 300 nm thick conventional single-cell device
- Title
- Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a similar to 300 nm thick conventional single-cell device
- Author
- 최효성
- Keywords
- LOW-BANDGAP POLYMER; POWER CONVERSION EFFICIENCY; ORGANIC SOLAR-CELLS; CONJUGATED POLYMERS; DENSITY FUNCTIONALS; TANDEM POLYMER; GAP POLYMERS; SOLID-STATE; PERFORMANCE; MORPHOLOGY
- Issue Date
- 2014-07
- Publisher
- Royal SOC Chemistry
- Citation
- Energy & Environmental Science, Sep 2014, 7(9), P.3040-3051
- Abstract
- We report a series of semi-crystalline, low band gap (LBG) polymers and demonstrate the fabrication of highly efficient polymer solar cells (PSCs) in a thick single-cell architecture. The devices achieve a power conversion efficiency (PCE) of over 7% without any post-treatment (annealing, solvent additive, etc.) and outstanding long-term thermal stability for 200 h at 130 degrees C. These excellent characteristics are closely related to the molecular structures where intra-and/or intermolecular noncovalent hydrogen bonds and dipole-dipole interactions assure strong interchain interactions without losing solution processability. The semi-crystalline polymers form a well-distributed nano-fibrillar networked morphology with PC70BM with balanced hole and electron mobilities (a h/e mobility ratio of 1-2) and tight interchain packing (a pi-pi stacking distance of 3.57-3.59 A) in the blend films. Furthermore, the device optimization with a processing additive and methanol treatment improves efficiencies up to 9.39% in a similar to 300 nm thick conventional single-cell device structure. The thick active layer in the PPDT2FBT: PC70BM device attenuates incident light almost completely without damage in the fill factor (0.71-0.73), showing a high short-circuit current density of 15.7-16.3 mA cm(-2). Notably, PPDT2FBT showed negligible changes in the carrier mobility even at similar to 1 mm film thickness.
- URI
- http://pubs.rsc.org/en/Content/ArticleLanding/2014/EE/C4EE01529K#!divAbstract
- ISSN
- 1754-5692
- DOI
- 10.1039/C4EE01529K
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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