may be intrinsic undoped or doped doping may be used to enhance conductivity see for example u s provisional patent application no 60 795 420 of beatty et al for u201c device including semiconductor nanocrystals and a layer including a doped organic material and methods u201d filed 27 apr 2006 which is hereby incorporated herein by reference in its entirety as discussed above in certain embodiments the second material can comprise a material capable of transporting holes an example of a typical organic material capable of transporting holes includes an organic chromophore the organic chromophore can include a phenyl amine such as for example n n u2032 diphenyl n n u2032 bis 3 methylphenyl 1 1 u2032 biphenyl 4 4 u2032 diamine tpd other materials capable of transporting charge include spiro tpd 4 4 u2032 n n u2032 dicarbazolyl biphenyl cbp 4 4 bis n 1 naphthyl n phenylamino biphenyl npd etc a polyaniline a polypyrrole a poly phenylene vinylene copper phthalocyanine an aromatic tertiary amine or polynuclear aromatic tertiary amine a 4 4 u2032 bis p carbazolyl 1 1 u2032 biphenyl compound or an n n n u2032 n u2032 tetraarylbenzidine a material capable of transporting holes comprising an organic material may be intrinsic undoped or doped doping may be used to enhance conductivity examples of doped hole transport materials are described in u s provisional patent application no 60 795 420 of beatty et al for u201c device including semiconductor nanocrystals and a.