Electron injecting layer including superacid salt, lithium salt or mixture thereof, photovoltaic device including the electron injecting layer, method of manufacturing the photovoltaic device, and organic light-emitting device including the electron injecting layer

An electron injecting layer of a photovoltaic device or an organic light-emitting device, the electron injecting layer comprising at least one of a superacid salt represented by Formula 1, a lithium salt represented by Formula 2 and a mixture of the compounds represented by Formulae 1 and 2:

• M+X−(YOmRf)n (1)
• wherein M+ is a lithium cation, sodium cation, and potassium cation, and Rf is a C1-C4 perfluoroalkyl group, and X−(YOmRf)n is one selected from the group consisting of bistrifluoromethanesulfonylimide (N(SO2CF3)2−), bistrifluoromethanecarbonylimide (N(COCF3)2−), bispentafluoroethanesulfonimide (N(SOC2F5)2−), bispentafluoroethanecarbonylimide (N(COC2F5)2−), bisperfluorobutanesulfonylimide (N(SO2C4F9)2−), bisperfluorobutanecarbonylimide (N(COC4F9)2−), tristrifluoromethanesulfonylmethide (C(SO2CF3)3−), and tristrifluoromethanecarbonylmethide (C(COCF3)3−);
• and
• LiVW4 (2)
• wherein V is boron or aluminum, and W is one of fluorine, chlorine and bromine.

A method of manufacturing an electron injecting layer, the method comprising:

• preparing a solution including at least one of a compound represented by Formula 1, a compound represented by Formula 2 or a mixture thereof dissolved in a solvent:
• M+X−(YOmRf)n (1)
• wherein M+ is an alkaline metal cation, and Rf is a C1-C4 perfluoroalkyl group, Y is carbon or sulfur, and X is oxygen, nitrogen or carbon, m=1 if Y is carbon, m=2 if Y is sulfur, n=1 if X is oxygen, n=2 if X is nitrogen, and n=3 if X is carbon;
• and
• LiVW4 (2)
• wherein V is a Group 13 element, and W is a Group 17 element;
• and
• spin-coating the solution on a target layer.