Effective absorption enhancement in small molecule organic solar cells using trapezoid gratings
- 1 March 2014
- journal article
- Published by IOP Publishing in Chinese Physics B
- Vol. 23 (3), 038803
- https://doi.org/10.1088/1674-1056/23/3/038803
Abstract
We demonstrate that the optical absorption is enhanced in small molecule organic solar cells by using a trapezoid grating structure. The enhanced absorption is mainly attributed to both waveguide modes and surface plasmon modes, which is simulated by using finite-difference time-domain method. The simulated results show that the surface plasmon along the semitransparent metallic Ag anode is excited by introducing the periodical trapezoid gratings, which induce the increase of high intensity field in the donor layer. Meanwhile, the waveguide modes result in a high intensity field in acceptor layer. The increase of field improves the absorption of organic solar cells significantly, which is demonstrated by simulating the electrical properties. The simulated results also show that the short-circuit current is increased by 31% in an optimized device, which is supported by the experimental measurement. Experimental result shows that the power conversion efficiency of the grating sample is increased by 7.7%.Keywords
This publication has 21 references indexed in Scilit:
- Surface-plasmon enhanced absorption in organic solar cells by employing a periodically corrugated metallic electrodeApplied Physics Letters, 2012
- Enhanced power-conversion efficiency in polymer solar cells using an inverted device structureNature Photonics, 2012
- Combined plasmonic gratings in organic solar cellsOptics Express, 2011
- The design of efficient surface-plasmon-enhanced ultra-thin polymer-based solar cellsApplied Physics Letters, 2011
- Influence of small-molecule material on performance of polymer solar cells based on MEH-PPV:PCBM blendChinese Physics B, 2010
- Plasmonics for improved photovoltaic devicesNature Materials, 2010
- Design of Plasmonic Thin‐Film Solar Cells with Broadband Absorption EnhancementsAdvanced Materials, 2009
- Organic solar cells: An overviewJournal of Materials Research, 2004
- Thin‐film solar cells: an overviewProgress In Photovoltaics, 2004
- Efficient bulk heterojunction photovoltaic cells using small-molecular-weight organic thin filmsNature, 2003