Photoemission spectroscopy was used to investigate the heterojunctions between InP(110) and two organic semiconductors, N,N′-diphenyl-N,N′-bis(1-naphthyl)-1-1′biphenyl-4,4″diamine (α-NPD) and copper-phthalocyanine (CuPc). Both interfaces exhibit dipole barriers that demonstrate the breakdown of the vacuum level alignment rule, and suggest a displacement of negative charge form the organic to the inorganic semiconductor. The direction of the charge displacement is consistent with the relative electron affinities and ionization energies of the solids.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of Applied Physics|
|State||Published - May 1 1999|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)