Abstract: Provided is a compound of Chemical Formula 1: wherein: Y1 to Y9 are each independently N, C—H, C-D, or C-L?-R, provided that at least one of Y1 to Y9 is N; L? is a single bond or a substituted or unsubstituted C6-60 arylene; R is a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing any one or more of N, O and S; L is a single bond, a substituted or unsubstituted C6-60 arylene, or a substituted or unsubstituted C2-60 heteroarylene containing any one or more of N, O and S; L1 and L2 are each independently a single bond or a substituted or unsubstituted C6-60 arylene; and Ar1 and Ar2 are each independently a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing any one or more of N, O and S; and an organic light emitting device including the same.

Abstract: An organic light emitting device including a light emitting layer which comprises a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2, and the organic light emitting device having improved driving voltage, efficiency and lifetime.

Abstract: A compound of Chemical Formula 1, and an organic light emitting device including the same.

Abstract: Provided is the structure of a thin film solar cell. The structure of the thin film solar cell includes a first substrate, a first electrode provided on the first substrate, a p-type semiconductor layer provided on the first electrode, a first buffer layer provided on the p-type semiconductor layer, an optical absorption region provided on the first buffer layer, a second buffer layer provided on the optical absorption region, an n-type semiconductor layer provided on the second buffer layer, a second electrode provided on the n-type semiconductor layer, and a second substrate on the second electrode. The optical absorption region includes a silicon layer, a first layer on the silicon layer, and a second layer having a different energy band gap from the first layer, on the first layer.

Abstract: Provided is a thin film silicon solar cell. The thin film silicon solar cell includes a light absorbing layer, a front transparent electrode disposed on one surface of the light absorbing layer to emit light having a first color, and a rear transparent electrode disposed on the other surface of the light absorbing layer to emit light having a second color.

Abstract: Provided are fabricating methods of a solar cell capable of displaying a predetermined color. The method includes forming a first electrode on a substrate and forming a light-absorbing layer on the first electrode. The light-absorbing layer may have a composition ratio, a content of the amorphous portion, or an energy bandgap controlled to absorb a light with a predetermined wavelength. In addition, selective transmission layers may be formed on and below the light-absorbing layer to control the color displayed by the solar cell. Furthermore, a second electrode may be formed on the light-absorbing layer.