prov:value
| - The hole transport layer can include, for example, a diamine derivative, such as N,N???-bis(3-methylphenyl)-N,N???-bis(phenyl)benzidine, N,N???-bis(3-naphthalen-2-yl)-N,N-bis(phenyl)benzidine, or a triarylamine derivative, such as 4,4???,4???-tris(N,N???-diphenylamino)triphenylamine, or 4,4???,4???-tris(N-3-methylphenyl-N-phenylamino)triphenylamine.
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