Journal
ORGANIC ELECTRONICS
Volume 59, Issue -, Pages 288-292Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2018.05.007
Keywords
Organic photovoltaics; Photocurrent mapping; Raman imaging; Combinatorial screening; Gradient; High throughput evaluation
Funding
- Spanish Ministerio de Economia y Competitividad (MINECO) [SEV-2015-0496]
- MINECO [MAT2014-59315-R, PCIN-2015-169-C02-01, MAT2014-57652-C2-1-R]
- Madrid Regional Government through MAD2D project
- China Scholarship Council [201406790019]
- European Research Council [ERC CoG648901]
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We report on a combinatorial optimization procedure applied to heterojunction small molecule organic solar cells made of evaporated copper phthalocyanine (CuPc) and 3,4,9,10-perylenetetracarboxylic bisbenzimidazole (PTCBI). Our strategy consists of depositing both light harvesting compounds as orthogonally arranged wedge-shaped layers to then determine the optimum thicknesses which yield the highest photoconversion efficiency. The device performance is locally assessed by means of light-beam induced current images. A quantitative model of co-locally measured Raman images allows determining the corresponding local thicknesses of the active layers. The spatial correlation of both datasets (i.e. local photocurrent density and active layer film thicknesses) enables the rapid optimization of the photovoltaic system studied employing a single functional device, reducing in approximately 20 times the use of resources and time.
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