Microstructured porous ZnO thin film for increased light scattering and improved efficiency in inverted organic photovoltaics
Date
2014Source Title
Optics Express
Print ISSN
1094-4087
Publisher
Optical Society of America
Volume
22
Issue
21
Pages
1412 - 1421
Language
English
Type
ArticleItem Usage Stats
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Abstract
Microstructured porous zinc oxide (ZnO) thin film was developed and demonstrated as an electron selective layer for enhancing light scattering and efficiency in inverted organic photovoltaics. High degree of porosity was induced and controlled in the ZnO layer by incorporation of polyethylene glycol (PEG) organic template. Scanning electron microscopy, contact angle and absorption measurements prove that the ZnO: PEG ratio of 4:1 is optimal for the best performance of porous ZnO. Ensuring sufficient pore-filling, the use of porous ZnO leads to a marked improvement in device performance compared to non-porous ZnO, with 35% increase in current density and 30% increase in efficiency. Haze factor studies indicate that the performance improvement can be primarily attributed to the improved light scattering enabled by such a highly porous structure. (C) 2014 Optical Society of America