Ligand-Free Synthesis of Aluminum-Doped Zinc Oxide Nanocrystals and their Use as Optical Spacers in Color-Tuned Highly Efficient Organic Solar Cells
2016 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 26, no 2, 243-253 p.Article in journal (Refereed) PublishedText
The color of polymer solar cells using an opaque electrode is given by the reflected light, which depends on the composition and thickness of each layer of the device. Metal-oxide-based optical spacers are intensively studied in polymer solar cells aiming to optimize the light absorption. However, the low conductivity of materials such as ZnO and TiO2 limits the thickness of such optical spacers to tenths of nanometers. A novel synthesis route of cluster-free Al-doped ZnO (AZO) nanocrystals (NCs) is presented for solution processing of highly conductive layers without the need of temperature annealing, including thick optical spacers on top of polymer blends. The processing of 80 nm thick optical spacers based on AZO nanocrystal solutions on top of 200 nm thick polymer blend layer is demonstrated leading to improved photocurrent density of 17% compared to solar cells using standard active layers of 90 nm in combination with thin ZnO-based optical spacers. These AZO NCs also open new opportunities for the processing of high-efficiency color tuned solar cells. For the first time, it is shown that applying solution-processed thick optical spacer with polymer blends of different thicknesses can process solar cells of similar efficiency over 7% but of different colors.
Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2016. Vol. 26, no 2, 243-253 p.
azo; interfacial layers; nanocrystals; organic solar cells; zinc oxide
IdentifiersURN: urn:nbn:se:liu:diva-124634DOI: 10.1002/adfm.201502929ISI: 000368041200009OAI: oai:DiVA.org:liu-124634DiVA: diva2:901760
Funding Agencies|EU [FP7-ICT-2011-7, 287594]; SFUMATO-FUI Project [AAP12]; Generalitat Valenciana (Project Institute of Nanotechnologies for Clean Energies) [ISIC/2012/008]2016-02-092016-02-082016-02-09