Solution-Processed Metal Oxides Functioning as Hole Transport Layers HTLs

4 Solution-Processed Metal Oxides Functioning as Hole Transport Layers (HTLs) 

Molybdenum oxide (MoOj is typically an n-type semiconductor metal oxide with a high work function of over 5.0 eV. After metal oxide was introduced by the evaporation method to function as HTLs in OSCs, more and more 

High-resolution XPS data of the Mo 3-D core level peaks observed for molybdenum oxide thin films prepared from (a) anhydrous and (b) ambient-based precursor solutions as a function of annealing temperature in a nitrogen atmosphere. (Reprinted from ref. 74, with permission from John Wiley and Sons, http //onlinelibrary.wiley.com/ doi/10.1002/adma.201003065/abstract.) 

Method V - hydrogen molybdenum oxide bronze (HJtIoO. This was demonstrated by Xie et al. to realize a one-step method to synthesize low-temperature solution-processed The ethanol used in synthesizing the 

Avery similar method was realized later by using wet-milled transition metal oxide nanoparticles as buffer layers in OSCs. A wet grinding method was used to disperse the V2O5 into IPA. With the grinding process, the sizes of the metal oxide particles can be effectively reduced to obtain a stable colloidal solution which features a surfactant-free and large-scale solution process. 

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