A material comprising an electron-accepting unit of formula (I): wherein Ar1 and Ar2 independently is a 5- or 6-membered aromatic or heteroaromatic ring or is absent; and each X is independently H or a substituent with the proviso that at least one X is an electron-withdrawing group and wherein X groups bound to adjacent carbon atoms may be linked to form an electron-withdrawing group. The material further comprises an electron-donating unit D comprising a fused or unfused furan or thiophene. The material may be a polymer comprising repeat units of formula (I). The material may be a non-polymeric compound. An organic photodetector may contain a bulk heterojunction layer containing an electron acceptor or an electron donor wherein at least one of the electron acceptor and electron donor contains a unit of formula (I).

##STR00001##

A composition comprising a first organic electron donor material having an absorption maximum greater than 900 nm; a second organic electron donor material having an absorption maximum at a shorter wavelength than the first organic electron donor material; and an organic electron acceptor material. The composition may be used in an organic photodetector.

Provided is an intrinsically stretchable organic solar cell, a manufacturing method thereof, and an electronic device comprising the same. The intrinsically stretchable organic solar cell of the present invention is characterized that wherein excellent interfacial bonding among stretchable constituent elements constituting each layer is induced so that the constituent elements are seamlessly integrated into a single system, thereby ensuring excellent initial power conversion efficiency (PCE), and mechanical robustness showing that 70% or more of initial PCE is maintained in spite of repetitive tensile strains. Thus, the organic solar cell is useful for an electronic device applied to any one selected from a group consisting of sensors, electronic skins, flexible displays, and stretchable displays.

A method for enhancing aggregation state stability of organic semiconductor (OSC) films includes constructing the OSC film; introducing uniform and discontinuous nanoparticles on a surface of the film or an inside of the film. Electrical properties of the OSC film are not influenced by introducing the nanoparticles. Grain boundary, dislocation, stacking fault, and surface of the film are pinned by the nanoparticles, increasing potential barrier of the aggregation state evolution of the film, and thus enhancing the stability of the aggregation state and greatly improving maximum working temperature and storage lifetime of organic field-effect transistors. Under room temperature storage, morphology of the OSC film introduced with the nanoparticles is difficult to change, so that the stability of electrical properties of organic transistor components prepared from the film is ensured in a high-temperature and atmospheric working environment.

A photoelectric conversion device includes a first electrode, a photoelectric conversion layer, and a second electrode in sequence. The photoelectric conversion device includes a sealing member on a non-facing surface side of one electrode selected from the first electrode and the second electrode, the non-facing surface side not facing the photoelectric conversion layer. The sealing member includes an insulating layer, a metal layer, and a base in sequence from the one electrode. In an end of the sealing member in a surface direction, a length of the insulating layer in the surface direction is equal to or longer than a length of the metal layer in the surface direction, and the length of the metal layer in the surface direction is longer than a length of the base in the surface direction by 0.1 μm or more.

The present disclosure relates to an organic electroluminescent compound represented by formula 1 and an organic electroluminescent device comprising the same. By comprising the compounds according to the present disclosure, it is possible to provide an organic electroluminescent device having improved luminous efficiency and/or lifetime properties.

An organic photoelectric conversion device and an image sensor, the organic photoelectric conversion device including an upper electrode; a lower electrode; and an active layer between the upper electrode and the lower electrode, wherein the active layer includes bis-(4-dimethylaminodithiobenzyl)-Ni(II) (BDN) and [6,6]-Phenyl-C71-butyric acid methyl ester (PC70BM).

A composition comprising an electron-donating polymer and an electron acceptor wherein the electron-donating polymer comprises a benzo[1,2-b:4,5-b′]dithiophene repeat unit and wherein a film of the electron-accepting material has a peak absorption wavelength greater than 1000 nm. The composition may be used as a photosensitive layer of an organic photodetector.

A polymer comprising

##STR00001##

In this polymer, R, R′, and R″ are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups. Additionally, in this polymer X and X′ are independently selected from aryl groups. Finally, m independently ranges from 1 to 100 and n independently ranges from 0 to 99

A method comprised of combining

##STR00001## form a solution containing a polymer

##STR00002##

In this polymer R, R′, and R″ are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkoxy, alkylthio, ester, ketone and aryl groups; and X is selected from aryl groups.