Ordered P3HT/PCBM Heterostructured Organic Photodiode for Radiation Detection using Direct Nanoimprint Lithography

Abstract

We propose an organic photodiode for radiation detection with nanoimprinted structure in p-n junction to increase the X-ray induced current. It is found that the nanoimprited structure made from lower molecular weight P3HT, less than 90 K g/mol, is dissolved by the solvent of PCBM, that is, dichloromethane (DCM), on the other hand, the structure made from high molecular weight, 300 K g/mol, is not dissolved. The effect of expanding the p-n junction using nanoimprint lithography is observed in the case of visible light and X-ray induced scintillation light irradiation.