Abstract: The present invention enables on-demand production of an organic photoelectric conversion element regardless of the timing of material synthesis. Provided is a method for producing an organic photoelectric conversion element that comprises a pair of electrodes including an anode and a cathode, and an active layer that is provided between the pair of electrodes and includes a ?-conjugated polymer, said method including a storing step of storing the ?-conjugated polymer in an enclosure container which has an atmosphere therein that suppresses increase in the electron spin concentration of the ?-conjugated polymer, and a step of forming the active layer using the ?-conjugated polymer after storage.

Abstract: A polymer electrolyte membrane, wherein the period length L in the membrane surface direction, which period length is defined by formula (1) and is measured by using a small-angle X-ray diffractometer, is less than 52.0 nm: L=?1/(2 sin(2?i/2))??(1) wherein 2?i represents a scattering angle in the membrane surface direction and ?1 represents the wavelength of X-rays used when the scattering angle in the membrane surface direction is measured.

Abstract: A method for discriminating a polymer compound membrane, the method having selecting a polymer compound membrane which shows little time-dependent change in a relaxation time (T1?) when the T1? of the polymer compound membrane has been measured by using a solid-state NMR device with a magnetic field strength of 7.05 Tesla.

Abstract: A polymer electrolyte membrane, wherein the period length L in the membrane surface direction, which period length is defined by formula (1) and is measured by using a small-angle X-ray diffractometer, is in the range from 52.0 nm to 64.9 nm: L=?1/(2 sin(2?i/2))??(1) wherein 2?i represents a scattering angle in the membrane surface direction and ?1 represents the wavelength of X-rays used when the scattering angle in the direction of the membrane surface is measured.