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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Microlens array induced light absorption enhancement in polymer solar cells
Physical Chemistry Chemical Physics, Volume 15, No. 12, Year 2013
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Description
Over the last decade, polymer solar cells (PSCs) have attracted a lot of attention and highest power conversion efficiencies (PCE) are now close to 10%. Here we employ an optical structure-the microlens array (MLA)-to increase light absorption inside the active layer, and PCE of PSCs increased even for optimized devices. Normal incident light rays are refracted at the MLA and travel longer optical paths inside the active layers. Two PSC systems-poly(3-hexylthiophene-2, 5-diyl):(6,6)-phenyl C61 butyric acid methyl ester (P3HT:PCBM) and poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1, 3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]:(6,6)-phenyl C71 butyric acid methyl ester (PCDTBT:PC70BM)-were investigated. In the P3HT:PCBM system, MLA increased the absorption, absolute external quantum efficiency, and the PCE of an optimized device by ∼4.3%. In the PCDTBT:PC70BM system, MLA increased the absorption, absolute external quantum efficiency, and PCE by more than 10%. In addition, simulations incorporating optical parameters of all structural layers were performed and they support the enhancement of absorption in the active layer with the assistance of MLA. Our results show that utilizing MLA is an effective strategy to further increase light absorption in PSCs, in which optical losses account for ∼40% of total losses. MLA also does not pose materials processing challenges to the active layers since it is on the other side of the transparent substrate. © 2013 the Owner Societies.
Authors & Co-Authors
Chen, Yuqing
United States, Ames
Iowa State University
Elshobaki, Moneim
United States, Ames
Iowa State University
Egypt, Mansoura
Faculty of Science
Ye, Zhuo
United States, Ames
Ames Laboratory
United States, Ames
Iowa State University
Park, Joong Mok
United States, Ames
Ames Laboratory
United States, Ames
Iowa State University
Noack, Max A.
United States, Ames
Iowa State University
Ho, Kai Ming
United States, Ames
Ames Laboratory
United States, Ames
Iowa State University
Chaudhary, Sumit
United States, Ames
Iowa State University
Statistics
Citations: 51
Authors: 7
Affiliations: 3
Identifiers
Doi:
10.1039/c3cp50297j
ISSN:
14639076