In this study, an air‐stable bulk heterojunction organic solar cell demonstrated by utilization of titanium oxide (TiO 2 ) nanoparticles as a hole blocking layer was prepared through high‐energy grinding method. The large clumps of the anatase TiO 2 underwent deaggregation to form a stable dispersed solution during the grinding process. The resultant suspension can form a uniform and smooth TiO 2 film through spin coating on various substrates. Because of substantial oxygen and water protection effect of TiO 2 thin film, the bulk heterojunction solar cells exhibit a significant long‐term stability. It is also found that the cell performance can be promoted dramatically after ultraviolet activation. The mechanism responsible for the enhanced cell efficiency was also investigated. This solution‐based method does not require surfactants, thus preserving the intrinsic electronic and optical properties of TiO 2 that makes these proposed buffer layers quite attractive for next‐generation flexible devices appealing high conductivity and transparency. Copyright © 2014 John Wiley & Sons, Ltd. A facile, inexpensive, scalable, and clean preparation of TiO 2 nanoparticles solution via wet‐milling method was proposed. During the grinding process, large clumps of the TiO 2 underwent deaggregation to form a stable dispersed solution. The resultant suspension can form a uniform and smooth film through spin coating on various substrates. Corresponding TiO 2 interlayers effectively block holes and collect electrons from [6,6]‐phenyl C61‐butyric acid methyl ester, promoted dramatically after ultraviolet activation, in addition to significant enhancement in the durability of organic solar cells.
Wet‐milled anatase titanium oxide nanoparticles as a buffer layer for air‐stable bulk heterojunction solar cells
Progress in photovoltaics ; 23 , 8
2015
Article (Journal)
English
buffer layer , stability , electron , TiO , solar cells , solution process
BKL: | 53.36 Energiedirektumwandler, elektrische Energiespeicher |
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