prov:value
| - es of the electron donating dopant include alkali metals such as Li, alkaline earth metals such as Mg, transitionmetals such as rare earth metals, and reducing organic compounds.Metals having a work function of 4.2 eV or less are particularly preferably used as the metal dopant, and examples thereof include Li, Na, K, Be, Mg, Ca, Sr, Ba, Y, Cs, La, Sm, Gd, and Yb.
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